NEMATOIDEA. 409 
This genus connects the Nematoidea with the Parenchymata. 
One species is known—Tenia lanceolé, Chabert; Polystoma 
tenioides, Rud., Hist., I, xii, 8, 12; Pentastoma tenioides, Id. 
Syn., 123 which attains a length of more than six inches, | It 
is found in the frontal sinus of the Horse and Dog *. 
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 little hooks. 
But one species is known, the Cucullanus ascaroides, Geetz., 
pl. viii, f. 11, 117; Rud., Hist., I, xii; it inhabits the Siluri y. 
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 Intestinal Worms of this 
order, but as a different family. 
Lerna=a, Lin., 
Where the internal and external organization of the body is nearly 
the same as in the Nematoidea; but it is prolonged anteriorly by a 
corneous neck, at the extremity a which is a mouth variously armed 
and surrounded, or followed by productions of different forms. This 
mouth and its appendages are insinuated into the skin of the gills of 
fishes, and fix the animal there. The Lernee are also distinguished 
by two cords, sometimes moderate, and at others very long, or even 
much doubled, that are pendent from the sides of the tail, and which 
may possibly be ovaries f. 
: LERNZA proper, 
Where the body is oblong, furnished with a long and slender neck, 
and a sort of horns round the head. 
L. branchialis, L.; Encye. Vers, LXXVIII, 2. The most 
known species; it attacks the Codifish and other Gadi, and is from 
one to two inches in length. Its mouth is surrounded by three 
ramous horns, which, as well as the neck, are of a deep brown. 
Its more inflated body is bent into an 8, and the two cords are 
contorted in a thousand different ways. Its horns become rooted 
as it were, in the gills of fishes. Another, the 
* The mouth of the LINGUATUL#, Froelich, is exactly similar to that of this Pen- 
tastoma. I consequently presume that they belong to the same genus, although I 
could not examine their intestines on account of their minuteness. Such are the 
Tenia caprina, Gm., or the Polyst, denticulatum, Rud., Zool. Dan., III, ex, 4, 5 ;— 
Linguatula serrata, Ge.; Pol. serratum, Rud. ; Froel., Nat. Forsch., XXIV, iv, 14, 
15 ; the same as the TETRAGULA, Bosc., Bullet des Sc., May 1811, pl. ii. f. 1. These 
Worms now coustitute the genus PENTASTOMA of Rudolphi, Syn., 123. M. de 
Blainville prefers the name of LinGuatuLe. The Porocephalus crotali, Humb. Obs. 
Zool., pl. 26, probably belongs to the same genus. 
+ These two genera form the order ENTOMOZOAIRES APoODES ONCHOCEPHALES 
of M. de Blainville. 
}~ M. Surrirey found ova in these cords of a Lernzea, which (ova) appeared to him 
_ tocontain an animal, analogous to one of the Crustacea, and very different from the 
VOL, IV, EE 
