40 
forward as the little winding nterns to open anto the g^« s 
on the left of the male opening. The eggs are few in numbe. 
and are yellowish brown in colonr. The vrtellam are well 
developed,^ run np each side of the body "r U*^ te - 
end to between the ventral sucker and the fork of the mtestme 
They are composed of numerous follicles winch extend ac oss he 
body behind the testes, and transverse ducts unite m a v.tellanan 
receptacle dorsal to the ovary. 
The life history of this Trematode is not known but I think 
it very probable that a larval form found by myself in Cardium 
eM JLj be the young of L. raoMva Tart 
contained in sausage-shaped sporoeysts which riddled the soft pa 
of the cockle, and contained both free and encys ted eercarue. ™ 
free forms mostly possessed tails, but some had thrown then off 
previous to encysting, and the tails were actively moving ; about 
Lide the sporoeysts. The cercaria measured about 0 S I mm. m 
length, was covered with spines, and was oval in shape Oial 
sucker 0-04 mm. across; ventral sucker much smaller; ongish 
prepharyn,, conspicuous pharynx, very short oesophagus leading to 
L broad intestinal lobes reaching to the end of the body A 1 
these characters agree with L. rackiaa The excretory^ vesicl HJ 
however, different, as it is bilobed instead of simple, but here dee 
not seem much difficulty in conceiving that the shape of this organ 
might change. No traces of reproductive organs were seen in the 
Uari*. The cockle might very well be the host of the lana 
L. raohim, for it is one of the molluscs commonly eaten by the 
haddock and constantly found inside it. We may therefore suggest 
the following life history for L. W Mm .-First host, Cariru^ eduU 
(tailed cercariue developed in sporoeysts which akio enclo e h 
encysted forms); intermediate host, omitted; final host, the 
Haddock. 
Lepodora eloncjata, n. sp. (Hate II., figs. 5—6.) 
This may be the species mentioned by Odhner t but not described. 
I have found it in only two specimens of the Cod ( June) m the 
intestine just beyond the stomach, only very few specimens occur- 
ring in one fish. It is much like L. raoUm, but a good deal long 
in proportion to the width. All my specimens were colourless and 
* « On Throe Mollnsk-in testing Tiwnatodes." Ann. and Mag. Nat. Hist, Jan, 1907. 
t Odhner, " Fauna Arctica," page 337. 
