16 THE ROTIFERA. 
specimens agreed accurately with each other, as described above. In the open water 
they swam swiftly ; and it was difficult to confine them eyen with the compressor; for 
they soon managed, by contraction and elongation, to wriggle themselves out of the 
field of view. The Nats was from a pool at Walthamstow. Examining another Nats 
from the same phial, I found a single Albertia in the intestine; in another, an egg of the 
parasite was within the intestine, attached to a pellet of fecal matter, which pushed it 
along. The opacity of the bowel prevented my seeing whether any matured parasites 
were present or not in this case.—P.H.G.] 
Length, ,},, inch; diameter, 535 to yj55 inch. Habitat, Walthamstow (P.H.G.): 
entozoic. 
A. nAipis, Bousfield, sp. nov. 
(Pl. XVIL. fig. 14.) 
[SP. CH. Body moderately long, the cervical and pectoral parts the thickest, 
diminishing to the hind part ; toe minute, soft, papilliform ; integument slightly con- 
stricted in the hinder half. 
This species was discovered by Mr. Edward C. Bousfield, who has kindly communi- 
cated to me his own careful drawings and descriptive MS. notes. He has “several times 
observed it in sitw, in Nats barbata, living free within the cavity of the stomach of its 
host,”’ 
“Body cylindrical, soft, hyaline, vermicular, extremely flexible and telescopic, espe- 
cially the hinder part. Anterior extremity truncate. Trochal dise small, oblique, on 
dorsal aspect of body. [One drawing shows that it is invertile, the cilia being depicted 
far down the buccal funnel.—P.H.G.] Jaws very minute, protrusile, snapping. Ali- 
mentary canal conical, extending through the body, opening at the junction of the last 
two segments. Gastric gland semi-ovoid. Ovary straight, slender, cylindro-conical ; 
the ova developed serially. A minute contractile vesicle. 
‘Caudal appendage [= foot, P.H.G.] papilliform, composed of two joints [of which 
the terminal is] soft, resembling in its action the finger of an elephant’s trunk.” 
‘Habitat. Vicinity of London. Anterior portion of stomach of Nais, in which it 
moves freely. Egg about one-third of length of parent's body. Length, 5+, inch.’’? 
—P.H.G.] 
Genus TAPHROCAMPA, Gosse. 
(GEN. CH. Body fusiform or cylindrical, annulose, furnished with two furcate toes ; 
trophi forcipate ; rotatory cilia wanting or very limited. 
T. ANNULOSA, Gosse. 
(Pl. XVII. fig. 12.) 
Taphrocampa annulosa . . Gosse, Ann. Nat. Hist. 2 Ser. 1851, p. 199. 
SP. CH. Body cylindrical, short and thick, marked throughout with distinct articu- 
lations ; brain opaque; alimentary canal simple, wide, cylindrical; terminal fork 
thick, conical, acute. 
This animal is very larva-like; the body consists of many well-marked rings or 
segments which are set within the clear cylindrical integument, apparently touching 
this only at the points. Each of these, if viewed through the longitudinal line, would 
be of a sub-square outline, with four projecting angles, as seen at fig. 12b. In general 
no vortices are seen, nor any trace of vibratile cilia, so that I long concluded 
1 Thus the three recorded species differ nobably in their respective dimensions :—A. vermiculus 
being 3, inch to 3, inch (Duj.); A. intrusor, 74; in. (P.H.G.); A. naidis, 545 in. (Bousfield). 
