Exploration of the Red River of Louisiana, in the year 1852 / by Randolph B. Marcy ; assisted by George B. McClellan. Page: 233 of 368
xv, 286 p., [65] p. of plates (1 fold.) : ill., maps ; 24 cm.View a full description of this book.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
APPENDIX F.-FISHES.
217
longest. They all (the soft rays) bifurcate from their middle, and then
again subdivide from four fifths of their length to the tip. The caudal
fin is subcrescentic posteriorly; its angles are rounded; its length contained
five times and a half in that of the body and head together. The
central rays bifurcate three times upon their length. There are seventeen
rays in all, with a few rudimentary ones. The anal is well developed;
its three anterior spiny rays are the shortest, and not very conspicuous.
The eight remaining ones are soft and articulated; similar in structure
to those of the dorsal fin. The ventrals are inserted behind the base of
the pectorals; their tip, when bent backwards, reaching the anus, which
is situated a quarter of an inch in advance of the anterior margin of the
anal fin. This is subtriangular, posteriorly subtruncated, composed of an
anterior spiny ray, and five soft and articulated ones, which bifurcate
twice. The pectoral extends backwards as far as the ventrals. Its rays,
fifteen in number, are all soft and very slender, bifurcating twice. Only
thirteen of these rays are well developed. The formula of the fins is as
follows:
D X. 9 + 1; AIII. 8; C 2.1. 8. 7. 1. 1; V I. 5; P 15.
The scales are of medium size, longer than high, truncated anteriorly,
rounded posteriorly, and finely denticulated, as seen in fig. 4. The lateral
line does not extend beyond the insertion of the rays of the caudal, the
base of which is covered with scales irregularly disposed. The smallest
scales are observed under the head, upon the throat; the largest on the
peduncle of the tail.
The color is not sufficiently preserved in the single specimen collected
to admit of description. Traces of irregular lines are, however, visible
upon the cheeks and opercular apparatus.
Found in Otter creek, Arkansas.
Plate XII, fig. 1. Pomotis longulus, in profile, and of the size of life.
Fig. 2. A dorsal scale taken on the middle of the back, above the
lateral line.
Fig. 3. A scale from the lateral line, exhibiting the mucous tube.
Fig. 4. A scale from the sides of the abdomen, below the lateral line.
Figs. 2-4 are magnified twelve times.
2. POMOTIS BREVICEPS, B. opercular
flap very much developed, and directed upwards, black with a lighter
margin. Twenty-four rows of scales across the line of greatest depth,
Upcoming Pages
Here’s what’s next.
Search Inside
This book can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Book.
Marcy, Randolph Barnes. Exploration of the Red River of Louisiana, in the year 1852 / by Randolph B. Marcy ; assisted by George B. McClellan., book, 1854; Washington, DC. (https://texashistory.unt.edu/ark:/67531/metapth6105/m1/233/: accessed May 6, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Special Collections.