ANURAADSA. 123 
cilia produce vortices, but not wheels. A curved tubular antenna, with terminal bristles, 
issues from the sinus between the antlers. 
This pretty species occurred by myriads in one of my garden pans near London in 
the autumn of 1849; and I met with it again in the watering pond on Hampstead 
Heath ; but I have no record of it since. A great Bursaria, as well as Asplanchne, 
feeds voraciously upon it. It swims giddily, to and fro, with some swiftness.—P.H.G.] 
Length, ,1, inch. Habitat. Near London; Birmingham (P.H.G.): not rare. 
A. HYPELASMA, Gosse. 
(Pl. XXIX. fig. 6.) 
Anurea fissa . : 5 : . Gosse, Ann. Nat, Hist. 2 Ser. vol. viii. 1851, p. 202. 
(SP. CH. Lorica without spines, consisting of two plates, the dorsal arched, the 
ventral flat, commensurate ; and widely cleft through its medial line. 
When I obtained this species, in 1850, I could not satisfactorily determine the 
character of its ventral plate; but subsequently, on many occasions, and with great 
precision, I saw that it is a thin flat plate, of the full width, apparently connected with 
the dorsal only by membrane. It is, moreover, divided down the middle by a fissure of 
varying width ; I have even seen the pectoral edges of the fissure overlapping. These 
peculiarities, combined with the straight transverse occipital edge, might almost entitle 
this species to generic separation. The egg is (proportionally) of vast size, nearly half 
as large as the whole antmal; and not symmetrical, for, from the side at one end, 
projects a nipple, by which it remains attached to the parent. One I saw hatched. The 
young escaped at the part where the pedicle was, head foremost, rotating freely. It was 
exactly like the parent, and fully three-fourths of its size. There is evidently an anal 
orifice, whence frequently protrudes a very delicate membrane (doubtless the rectum), 
with its end expanded and recurved (fig. 6). When the rotating front is retracted, there 
are seen two shelly lobes rising from within the lorica, which approach to contact, and 
thus protect the head (fig. 6a). The internal structure is normal. Some specimens 
were thickly infested with a minute Infusorium (Colaciwm ?).—P.H.G.] 
Length, ;}, inch. Habitat. Near London; Leamington; Stapleton Park, York- 
shire; Dundee; Torquay (P.H.G.): rather common. 
A. TEcTA, Gosse. 
(Pl. XXIX. fig. 10.) 
Anurea tecta . 9 5 6 6 Gosse, Ann. Nat. Hist. 2 Ser. vol. viii. 1851, p. 202. 
(SP. CH. Nearly as curvicornis, but more pointed ; and the tesselations are larger, 
and arranged on each side of a mesial dorsal ridge, which gives to the back the form of 
a vaulted roof. 
Of this pretty little species I have slight record. The arrangement of its facets suffi- 
ciently distinguishes it. It is high and nearly circular in transverse section. One that 
I saw carried a large egg-shell.—P.H.G.] 
Length, ;}, inch. Habitat. Near London; Birmingham (P.H.G.): rare. 
A. acuLEata, Ehrenberg. 
(Pl. XXIX. fig. 4.) 
Anurea aculeata . : 6 0 Ehrenberg, Die Infus. p. 508, Taf. Ixii. fig. 14. 
= brevispina. . 2 Gosse, Ann. Nat. Hist. 2 Ser. vol. viii. 1851, p. 202. 
(SP. CH. Lorica oblong-square in outline, slightly arched dorsally, flat, or concave, 
ventrally ; the normal occipital spines six, of which the antlers are procurved ; each of 
