134 THE ROTIFERA. 
intestine is frequently constricted and narrow towards its end. The gastric glands are two 
lobed. He further notices the lateral canals, and a bladder-like organ which he conjec- 
tures to be the testicle, but which was probably the contractile vesicle. Two red globular 
eyes are seated in the corona, not far asunder. The mature eggs, which are green, are 
carried at the posterior end of the body. There are three pairs of limbs attached to the 
ventral surface. The foremost pair is the longest, the middle pair is less, and the lowest 
pair is the least. Two streaked muscles run down the first pair of limbs, and one muscle 
down each of the other four. All the limbs are terminated by fans of sete. H. poly- 
ptera does not appear to have any ciliated processes on the dorsal hind surface. 
ADDENDA. 
[ASPLANCHNA MyRMELEO, Elirenberg (vol. i. p. 123: footnote). This interesting 
species is no longer an alien. Mr. Hood has lately sent me, from Dundee, hying and 
healthy examples. They seemed to possess no contractile vesicle.-—P.H.G. | 
[ERETMIA TRITHRIX, Gosse, sp. noy. (Pl. XXVIII. fig. 2). Lorica a three-sided box, 
of which the posterior end is a triangle, and carries a long elastic seta at each angle: 
egg, when laid, carried between the alvine sete. Length, 1, inch. Lacustrine.—P.H.G.] 
[ERETMIA TETRATHRIX, Hood, sp. noy. (Pl. XXVIII. fig. 1). Lorica shaped like a 
deep obconic wine-glass, of which the foot is represented by a very long straight seta: 
three similar sete stand up from the occipital margin. Length, of lorica, +} inch; total 
aij inch. Lacustrine.—P.H.G.] 
Notommata WERNECKII, Ehrenberg. I am indebted to Mr. Fred. Bates for some 
threads of Vaucheria sessilis bearing many of the galls caused by this parasitical Rotiferon. 
Mr. Bates says that he has found the animal in abundance inhabiting these galls, which 
may occur anywhere along the thread of the Vaucheria: but that he has not found the 
parasites in the reproductive cells (see vol. i. p. 39). 
Length (according to Balbiani), +}, inch. Habitat. Neighbourhood of Leicester 
(Mr. F. Bates). 3 
(Hoists prycurA, Ehrenberg (Pl. XXX. fig. 3). This is no doubt Ehrenberg’s 
Ptygura melicerta. Tt has a two-lobed corona; a wide dorsal gap; no visible ventral 
antenne ; a pair of large dorsal hooks, adnate for half their length; a stout wrinkled 
foot; and an irregular floccose tube. It was found last May, at Twickenham, by Mr. 
G. Western, who kindly sent me the living specimen, from which fig. 8 has been drawn. 
Its position, in one of the axils of the plant to which it was attached, prevented me from 
measuring it; but it seemed to be about the size of an ordinary Cicistes crystallinus. 

The following remarkable Rotifera are as yet unknown in Britain. 
Banarro canvus (Pl. XXX. fig. 6), Hd. Claparéde (15). This is an il-loricated 
Rotiferon, parasitic on different species of Oligocheta. Its peculiar hind extremity is 
shown in the figure. Mastax very small, containing two minute curved rami; stomach, 
simple and straight; ovary large ; ciliary wreath and antenna wanting ; nervous, and 
vascular systems apparently absent. 
DriLopHAGA BUCEPHALUS (Pl. XXX. fig. 5), F. Vejdovsky (150). An il-loricated 
Proales-like Rotiferon, parasitic on Lumbriculus variegatus ; it adheres by its trophi to 
the worm’s hinder segments, and sucks its juices; nutritive, secreting, and vascular 
systems normal. 
Seison Gruset (Pl. XXX. fig. 4), C. Claus (17, 18). A doubtful Rotiferon ; il-lori- 
cated, of extraordinary form, parasitic on Nebalia; aliary wreath a few cilia at the 
mouth ; secreting system highly developed ; nutritive system present in the male as 
well as in the female; vascular system very rudimentary ; jaws rotiferous. 
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