188 
CLASS Y. 
Note-—Doubtful genera: Gyrodactylus Norpm., Mikrogr. Beitr. 
1. p. 195, Hectocotylus Cuv. Ann. des Sc. nat. Tom. xvi. 1829, p. 
147, Tab. xt. A, Phenicurus Rup. (Vertumnus Orto, Nov. Act. 
Acad. Leop. Car. xt. 2, p. 294, Tab. xu. fig. 1). Comp. Dusarpin 
Hist. Nat. des Helminthes, pp. 480—482, and 640. 
Orpver Il. Celelmintha s. Utricularia. 
Entozoa with nutrient canal suspended in a distinct abdominal 
cavity, supplied with mouth and anus. Sexes distinct. 
Family IV. Nematoidea. Body round, elastic, often attenuated, 
filiform. 
Phalanx I. <Acanthotheca Diestnc. Mouth inferior between 
two pores on each side which emit a single or double hooklet. 
Body roundish or depressed, transversely annulate. 
Pentastoma Ruv., Linguatula Fraiicn, Lam. 
The worms of this genus were arranged by Rupoupui with the 
Trematoda, but they differ from these by their internal structure ; 
in external form some species resemble the Cestoidea ; they form a 
small group which ought to be separated from the proper Vematoidea, 
but still belongs to the Celelmintha. Comp. on this genus G. M. 
Diesine Versuch einer Monographie der Gattung Pentastoma, An- 
nalen des Wiener Museums 1. 1835, s. 1—32, Tab, 1.—tv. 
Sp. Pentastoma tenioides Ruv., Linguatula tenioides Lam., Cuv., OWEN, 
Rup. Entozoor. Hist. nat. Tab. x11. figs.8—12, BremsEeR Jcon. Helm. Tab. X. 
figs. 14—16, Drmsine 1. 1. Tab. 11. figs. :—5, OwENn Trans. of Zool. Soc. I. 
4. 1835, pp. 325—330. Pl. 4, f. 1o—16; Mrram, Beitrag zu einer Anatomie 
des Pent. tenioid. Nov. Act. Acad. Cus. Leop. Car, Tom. Xvit. 1835, pp. 
623—646, Tab. 46, Ann. des Sc. nat. 2° série, Tom. vi. 1836, Zool. p. 135, 
Pl. 8; in the frontal sinus of the dog and the wolf, also in the larynx of 
these animals, and, according to some observations, in the frontal sinuses 
of the horse and the ass; the male is four times smaller than the female, 
which attains a length of three inches and more. 
Pentastoma moniliforme Diusine 1. 1. Tab. Iv. figs. 11—r13 ; in the lungs 
of the Indian serpent (Python). 
The name Pentastoma is to be rejected, because the four lateral openings 
near the mouth are not mouths, and because by its resemblance to similar 
names of genera of Trematoda it may easily mislead to the idea of an 
union with this division. It is, however, so generally received, that it can 
scarcely be altered without needless confusion. The name Linguatula of 
FRa@LICH as the older would deserve the preference, but it applies properly 
