GENUS riROLOTDA. 39 



eyes, jaws armed with small, horny, curved, reddish 

 points, arranged in a pectinate manner — two nervous 

 ganglions, one above the eyes and the other at the base of 

 the dorsal fin, united by nervous threads, and furnishing 

 numerous smaller ones, extended to various parts of the 

 body. 



The intestinal tube in the first species, is reddish, and 

 extended from the jaws to the nucleus, wiihout any sen* 

 sible enlargement. In the second species it is abruptly 

 enlarged near the nucleus, and in the third, the intestine 

 is filiform before that part. 



The branchia, are proportionally much smaller than 

 in the Firolse, and tiie nucleus shorter and more spherical, 

 and of a pale colour. 



I have not observed the vermiform organ in the ani- 

 mals under consideration, but in the first and second spe- 

 cies a long filiform appendasce appears to me to be the 

 oviduct, including small globules resembling eggs; this 

 part is very probably elongated by receiving the eggs? 

 and when these are exhausted it is perhaps detached en- 

 ^rely, and the body then resembles the species fig. 3, 



SPECIES. 



1, F, Demarestia. Body long, glabrous, hyaline, 

 acuminated at each extremity; no gelatinous points. 



Plate 2, fig. 1. ^ position of the eyes and nervous 

 ganglion between them; a. oviduct, magnified. 



Inhabits the ocean near Martinique, taken in March 

 1816. 



Dorsal fin rounded, nearer to the eyes than to the nu- 

 cleus. Lengil o die body two inches. 



2, F. jBlainvUiiana, Body s lort^ glabrous, posterior 



