356 . ENTOZOA, 
from which issue little hooks. The intestine is straight and the 
genital vessels are long and tortuous. Both the former and latter 
open externally at the posterior extremity... Near the mouth are 
two ceca as in Echinorhynchus. A white thread encircles the 
mouth and gives off two descending trunks in which I think I have 
recognized the appearance of anervous system. 
This genus connects the Nematoidea with the Parenchymata. 
One species is known—Teenia lanceolé, Chabert; Polystoma 
tenioides, Rud., Hist., II, xii, 8, 12; Pentastoma tznioides, Id. 
Syn., 128—which attains a length of more than six inches. It 
is found in the frontal sinus of the Horse and Dog(1). 
~ 
This is probably the place for the 
PRIONODERMA, Rud. 
Where the body and intestines are very similar, but where the 
mouth is at the anterior extremity, simple, and armed with two lit- 
tle hooks. 
But one species is known, the Cucullanus ascaroides, Geetz., 
pl. viii, f. ii, iii; Rud., Hist., II, xii; it inhabits the Siluri(2). 
The following genus, which, when we are furnished with 
more complete details of its economy, will have to be divided 
into several genera, we think should be placed after the In- 
testinal Worms of this order, but as a different family. 
LERNzA, Lin. 
Where the internal and external organization of the body is nearly 
(1) The mouth of the Lryevarutm, Froelich, is exactly similar to that of this 
Pentastoma; [ consequently presume that they belong to the same genus, although 
Icould not examine their intestines on account of their minuteness. Such are 
the Tania caprina, Gm., or the Polyst. denticulatum, Rud., Zool. Dan., III, cx, 4, 
5;—Linguatula serrata, Gm.; Pol. serratum, Rud.; Froel., Nat. Forseh., XXIV, iv, 
14, 15; the same as the Terracuna, Bosc., Bullet. des Sc., May 1811, pl. ii, f. 1. 
These Worms now constitute the genus Penrastoma of Rudolphi, Syn., 123. 
M. de Blainyille prefers the name of Linevarutr. The Porocephalus crotali, 
Humb., Obs. Zool., pl. 26, probably belongs to the same genus. 
(2) These two genera form the order Enromozoarres Apoprs ONCHOCEPHALES 
of M. de Blainyille. 
