192 CLASS V. 
of the body are simple, in the posterior part evanescent. Head sub- 
globose, beset with simple spinules. Mouth bivalved naked. Tail 
of male spiral, with genital spiculum elongate, simple. 
Sp. Cheiracanth. robustus Dims. Ann. des Wien. Mus, 11. 1840, Tab. Xv. 
figs. 1—7 ; in the stomach of different species of Cat. This animal has 
four long sacs near the cesophagus which recal the lemmnisci of the Acan- 
thocephala. According to D1EsInG the genus Gnathostoma OWEN, (Pro- 
ceedings of the Zool. Society tv. 1836, pp. 123—126), a worm found in the 
walls of the stomach of a tiger, is not distinguishable from this ; the mouth 
however is differently described by OWEN. 
Lecanocephalus Diestnc. Body anteriorly obtuse, with head 
expanded in form of a platter, and mouth trilabiate. Simple 
spines surrounding the body in zones. Tail of male inflected, with 
double spiculum. 
Sp. Lecanoc. spinulosus Drestne, Ann. des Wien. Mus. 11. Tab. XIV. figs. 
12—20., 
Ancyracanthus Dirsinc. Body acuminate at both ends. Mouth 
orbicular, armed with four spimules pinnatifid, disposed in a cross. 
Tail of male inflected, with double spiculum. 
Sp. Ancyr. pinnatifidus Dimsine, Ann. des Wien. Mus. 1. Tab. Iv. figs. 
21—27; in the stomach and small intestine of South American tortoise. 
Here also there are four long cxcal sacs near the cesophagus, as in Cheira- 
canthus. 
Note.—To the Nematoidea are also referred some filiform entozoa, included 
in a vesicle. In the peritoneum of various fishes, between the coats of 
the intestines and elsewhere a white worm of this sort, convoluted spirally, 
is found, which Linnaus called Gordius marinus, Rupoupar LPilaria 
pisctum. Comp. SIEBOLD in WiecM. Archiv. Iv. 1838, pp. 305, &e. 
Here also belongs a microscopic worm found by OWEN in the muscles of 
man, and called 7'richina spiralis. See Transact. of the Zool. Soc. 1. 4to. 
1835, pp. 315 —324, Tab. 41, figs. 1—g9. Is it a Nematoid in an imperfect 
state, the rest of whose fortunes are unknown? [This is V. SmmBoxp’s 
opinion. The encysted 7richina is sexless and does not increase in size. 
Sometimes the liver of different marine fishes is beset with cysts containing 
round worms which have grown to an inch or more in length; they have 
been named Ascaris capsularis, Filaria piscitwum, &c. SYEBOLD could never 
discover in them sexual organs, but still they have so remarkable a 
resemblance to Ascaris osculata, spiculigera, angulata, &c., worms with 
developed sexual organs which live in the intestinal canal of the Seal, the 
Cormorant, the Diver, the Gull, and predaceous fishes, that they may be 
suspected to be related to them. SrEBoLD believes that the encysted sexless 
worms only attain their perfect development in the intestine of the verte- 
brates which have swallowed their temporary hosts. Von SreBotp Band 
wu. Blasen-wiirm. 8. 32, 33. 
