46 
The testes are oval, 0-40 mm. long, the hind testis distant from 
the posterior end about 0-8 mm. The cirrus sac is long and 
curved, reaching as in S. pristis not halfway between the ventral 
sucker and the ovary, containing a simple club-shaped vesicula 
seminalis, pars prostatica, and long cirrus, the part of the sac 
surrounding the cirrus being lined with spines as in S. pristis. 
The male duct opens into the genital sinus behind the ventral 
sucker. The ovary is round, placed in front of the foremost testis, 
and about 0-5 mm. from it. The uterus, with few loops, runs 
forward as a vagina, armed with spines like the male duct, to open 
by the side of it. The eggs measure 0-08 mm. in length, and are 
not numerous. The vitellaria are well developed, reaching from the 
posterior end of the body to about halfway up the thick portion of 
the vesicula seminalis, filling up the space between, behind and in 
front of the testes and in front of the ovary, composed of many 
follicles united by a longitudinal duct each side, the ducts only and 
not the follicles running up the sides of the testes. 
The life history is not known. 
Stephanochasmus caducus (Looss). (Plate III., figs. 1—2.) Looss, 
op. cit. 
This species, as Looss points out, is very like S. pristis, and was 
found by him in the same host, Gadus minutus. My specimen 
(again only a single one) came from the intestine close to the 
pyloric ca3ca of the Whiting (June). It differs from S. pristis in 
the armature of the head, the relation in size of the suckers and 
general figure, the breadth of the present species being greater 
than in 8. pristis, the worm therefore not looking so thread-like. 
Length 4-4 mm., breadth 0-34 mm. The body is covered with 
spines. Head spines, forty-eight in two unbroken rows of twenty- 
four each, the longer spines being the upper ones (upper spines 
0-039 mm., lower spines 0*033 mm. long). The oral and ventral 
suckers are about the same size, 0-30 mm. across in my specimens, 
which is greater than Looss's (0*17 mm. in individuals, 4-02 mm. 
long). The mouth leads to a prepharynx, 0-34 mm. long, the 
pharynx is conspicuous, and oesophagus short, leading to two thin 
intestinal lobes reaching almost to the posterior end of the body. 
The testes are oval, 0*35 mm. long. The vesicula seminalis is 
club-shaped and contained in a rather long cirrus sac which does 
not reach halfway between the ovary and the ventral sucker ; the 
cirrus sac also contains the pars prostatica and long protrusible 
