ANUILEADjE. 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 Asplanchnce, 

 feeds voraciously upon it. It swims giddily, to and fro, with some swiftness. P.H.G.] 



Length, ^ inch. Habitat. Near London ; Birmingham (P.H.G.) : not rare. 



A. HYPELASMA, GoSSC. 



(PI. XXIX. fig. 6.) 

 Anuraafissa ..... Gosse, Ann. Nat. Hist. 2 Ser. vol. viii.' 1851, p. 202. 



[SP. CH. Lorica witJwut 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 animal ; 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 (Colaciumt}. P.H.G.] 



Length, ^i<y inch. Habitat. Near London ; Leamington ; Stapleton Park, York- 

 shire ; Dundee ; Torquay (P.H.G.) : rather common. 



A. TECTA, Gosse. 

 (PI. XXIX. fig. 10.) 

 Anuraa tecta ..... 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, ^J^ inch. Habitat. Near London ; Birmingham (P.H.G.) : rare. 



A. ACULEATA, Ehrenberg. 

 (PI. XXIX. fig. 4.) 



Anurcea aculeata .... Ehrenberg, Die In/us, p. 508, Taf. Ixii. fig. 14. 

 brevispina. . . . Gosse, Ann. Nat. Hist. 2 Ser. vol. viii. 1851, p. 202. 



[SP. CH. Lorica oblong-square in outline, slightly arched dorsally,flat, or concave, 

 vcntrally ; the normal occipital spines six, of which the antlers arc procurvcd ; each of 



