618 W. S. NICKERSON, 



2. Genus: Macras2)is Olsson 1868. 



Literature: Bbaun '89 — '93. — Jägerskiöld '99. — Monticelli '92. — 

 Olsson '68; 96. 



Body greatly elongated, cylindrical, tapering anteriorly. Adhesive 

 organ covering the ventral surface thro' nearly the entire length of 

 the body, sharply defined ; raade up of a single row of transversely 

 elongated alveoli. Marginal sense organs present. Mouth terminal, 

 Pharynx medium, Oesophagus short and muscular, intestiue simple, 

 near dorsal surface, reaching nearly to posterior extremity. Genital 

 opening median in the depression at the anterior margin of the ventral 

 adhesive organ. Ovary at beginning of second quarter. Laurer's 

 caual present. Paired vitellary glands in form of continuous elongated 

 Cords, placed laterally and extending on each side from region of 

 ovary back nearly to posterior end of body. Vitellary ducts paired. 

 Uterus long: eggs numerous, large, oval. Testis Single, large, near 

 posterior end. Penis present. 



Live as parasites in the gall bladder of fishes; larva not known. 



The only species is 



M. elegans Olss. 1868. 

 In gall bladder of Chimaera monstrosa on the coast of Europe. 



3. Genus: Cotyloyaster Mont. 1892. 

 Literature: Buaun '89 — '93. — Monticelli '92. — Nickerson '99. 



Body in two regions a narrower anterior and a broader posterior 

 portion within which the former may be partially retracted telescopic- 

 ally. Ventral adhesive organ raore than half the total length of the 

 body ; composed of a Single longitudinal row of transversely elongated 

 grooves, which is surrounded by a marginal row of a smaller rounded 

 alveoli. Marginal sense organs present. Mouth near centre of a disk- 

 like expansion of the anterior end. Prepharynx long; pharynx medium. 

 Intestine extending thro' more than -/g the length of the body. 

 Genital pore median, ventral, in front of anterior margin of ventral 

 shield. Ovary a little smaller than testes. Uterus long and varicose. 

 Vitellaria laterally placed. Testes 2, posterior to ovary. Musculature 

 forming a double visceral sack. 



Live as parasites in the intestine of fishes. 



The species are: 



C. michaelis Mont. 1892. 



In the intestine of (hntharus vulgaris (Trieste). 



