INDIGENOUS TO IllKLAND. 351 



Genus 5. — Cucullanus. 



(Derived from CucuUils, a hood.) 



Body cylindrical and elastic, obtuse anteriorly, more attenuated posteriorly; 

 mouth orbicular ; head provided with a striated cucullus (from which 

 circumstance the genus has been named) ; anus terminal ; orifice of 

 female organs a little behind the centre of the body; male organ a 

 double spiculum ; all the species viviparous. 



The name Cucullus was given to this genus by Miiller ; the 

 species inhabit the alimentary canal offish, and do not occur 

 in either Mammalia or birds, 



CUCULLANUS. 



1. Cucullanus e%am K. 



2. „ foveolatus L. 



Stomach, intestines and pyloric append- 

 ages of perch. 

 Intestines of eel {Anguilla acutirostris.) 

 Intestines of plaice. 

 Intestines of dab {Platissa Limanda.) 



males, and much more numerous. The mouth is orbicular, and every 

 small ; on each side of the head is a transparent membrane, somewhat 

 resembling that of the Ascaris vermicularis. 



K. The Cucullanus elegans is very common in the perch, occurring in 

 the stomach, intestines, and pyloric appendages. The species is vivipa- 

 rous, as when some of the females have been accidentally cut across, I 

 have seen the young come out in great numbers, and move about freely in 

 water placed in a watch-glass. 



The Cucullanus elegans is more rarely met with in the eel than in the 

 perch ; sometimes they were free in the intestinal canal, at others, attached 

 to the mucous membrane, almost as firmly as Echinorhynchi. They were 

 of a reddish colour, the head a deeper red than the body ; after remaining 

 in water for some time, every part became white except the head. 



The female Cucullanus elegans from the eel is about 4^ lines in length,* 

 the male about 2 lines. The head is rounded, and is pretty accurately 

 represented in the magnified figure in Bremser's large work. The strice 

 upon the cucullus are numerous and run longitudinally ; the mouth is or- 

 bicular, in some a small papilla projected ; the oesophagus is narrow at its 

 commencement, and runs in a straight line to the stomach, which is some- 

 what oblong and double the diameter of the oesophagus ; the intestine 

 is straight, the anus is situated near the posterior extremity. The vulva 

 in the female is conspicuous, projecting, seated nearer the caudal than the 

 anterior extremity of the body ; the penis of the male (in the specimens 

 which I met with), did not project externally. In the female, the caudal 

 extremity is rather sharp, not obtuse as Rudolphi describes it to be ; it is 

 straight in the female, inflexed in the male. 



L. The Cucullanus foveolatus from the plaice, in some instances, adhered 

 firmly to the mucous membrane of the intestine ; very soon after being 

 placed in water, the integuments ruptured and allowed the ovaries, &c. to 

 protrude. I have not observed that this species is viviparous. 



