ANURZAD. 125 3 
the lateral pair projects from the midst of a much thicker cylinder. There are two 
square antenne. ‘The eye is large, sparkling in sunlight, and refractile-—P.H.G. | 
Length, ;},inch. Habitat. Near London; Birmingham; Dundee (P.H.G.): common. 
Genus NOTHOLGA, Gosse, gen. nov. 
(GEN. CH. Lorica ovate, truncate and six-spined in front, sometimes produced 
behind ; of two spoon-like plates united laterally ; no hind spines ; dorsal surface 
marked longitudinally with alternate ridges and furrows ; expelled egg not usually 
carried. Lacustrine and marine. 
The genus thus indicated may include the species biremis, striata, inermis (young ?), 
acuminata, and foliacea (?) of Ehrenberg, together with others, which appear to be 
hitherto undescribed.—P.H.G. | 
N. acuminata, Hhrenberg. 
(Pl. XXIX. fig. 3.) 
Anurea acuminata 3 é ‘ Ehrenberg, Die Infus. 1838, p. 506, Taf. Ixii. fig. 9. 
[SP. CH. Lorica produced behind into a long truncate point, spoon-shaped ; ven- 
tral plate concave, one-third shorter than the dorsal. 
The form is very elegant. Of the frontal spines the antlers are nearly straight, the 
laterals moderately long, the intermediaries very short. From their six points, and from 
their five interspaces, run strongly marked lines throughout the lorica, of which the 
former are elevated, the latter depressed angularly. The junction of the ventral plate 
is about one-third from the point where the cloaca opens. Here two muscle-threads are 
affixed, connected with the rectum, which they draw down. An ample contractile vesicle 
receives on each side a conspicuous branchial duct, which in some parts is slender, in 
others much expanded and corrugated, including many vacuoles, and carrying two 
vibratile tags each. A remarkable structure is seen in apparent connection with these 
organs, which recalls the pyriform sacs seen in Pterodina. The esophagus is long, and 
attached to it on each side is a small vessel which seems the ordinary gastrie gland. 
But somewhat behind these are seen a pair of sacs, connected with the stomach on each 
side, and each giving off two threads, by one of which it is fastened to the lining mem- 
brane of the lorica, while the other runs down for some distance parallel with, and close 
beside, the tortuous vessel (branchia?), and is then attached to the interior, where two 
remarkable shelly bosses are seen. The stomach itself is tied to the lorica by threads, 
which are probably muscular.—P.H.G.]. 
Length, ,'; inch. Habitat. Ornamental waters near London (P.H.G.): very rare. 
N. tonaispina, Kellicott. 
(Pl. XXVIII. fig. 6.) 
Anurea longispina . 3 ° ° Kellicott, Amer. J. Micr. iv. 1879, p. 20, with fig. 
fF a c c : A (Abstracted) J. Roy. Micr. Soc. ii. 1879, p. 157, with fig. 
7 =A ; : ; Levick, Midland Naturalist, ii. 1879, p. 241, 1 pl. 
»  spimosa . “ 4 6 Imhoff, Zool. Anzeig. Sept. 1883, No. 147, with fig. 
SP. CH. Lorica greatly produced behind so as toresemble a frontal spine; dorsal 
and ventral plates conumensurate ; of the six occipital spines the central pair consists of 
one very long curved spine, and of one aborted straight spine; the lateral pair, of two 
long, and curved ; and the remaining pair, of two short, and straight ; the ventral plate 
has a movable flap with a straight pectoral edge. 
Notholca longispina does not readily lend itself to any theory on the cause of an 
