118 FIROLIDA. 
A. violacea, Quoy and Gaimard, Voy. Astrolabe, Zoologie, vol. 
MD AOB, 62.17 35 ae, EG ZO sce, nConcalc..gs At. Oval arather 
convex ; mantle fleshy, smooth, reddish or yellowish-brown, with nine 
fascicles of bristles on each side; valves close, triangular, violet, the 
first hexagonal; variety with the mantle yellowish-brown, sprinkled with 
red spots (Q. & G.) 
Length, 1 inch 8 lines; breadth, 1 inch 1 line; height, 6 or 7 
lines. 
Tasman Bay. Auckland. 
In this species the exposed parts of the valves are small, nearly 
cordiform, rather flattened, sharp in the middle, finely and very closely 
granulated throughout. The mantle is broad, horny, with nine whitish 
fascicles on either side (Reeve. ) 
Genus, CRYPTOCONCHUS—Blainville. 
Mantle with a single series of pores, thick, smooth, elevated at the 
pores into conical tubercles. Shell with the valves sub-cordate, the 
exposed part very small, linear, much longer than broad; the plates of 
insertion of all the valves have only a single notch on each side, which 
is sometimes rudimentary. 
Found in New Zealand only. 
C. porosus, Aurr0w ; Adams, Gen. Moll., pl. 55, f- 43; C. mon- 
ticularis, Quoy, Voy. Astrolabe, i., p. 406, pl. 73, f. 30-36; Reeve, 
Conch. Le., f. 573 Chenu, f- 2885. Oblong; mantle smooth, covering 
the whole body except a small linear opening at the apex of each valve; 
valves depressed, rounded ; posterior margins convex and emarginated ; 
exposed portions of valves smooth ; nine bundles of spines on each 
side, situated over the valves; dark reddish-brown when dry ; inside 
greenish-grey. 
Length, 1 ; breadth, .45. 
Dunedin to Auckland. 
When alive the mantle varies from bright orange to light brown. 
Sub-Order—Feteropoda. 
Dicecious, pelagic, translucent ; foot compressed, fin-like ; shell thin 
or none ; viscera in a nucleus ; gills pectinate or filamentary ; propo- 
dium vertical, fin-like, mesopodium suctorial in the males of some, the 
sucker having circular and radiating fibres. 
FAMILY—FIROLIDA. 
Animal cylindrical, translucent, furnished with ventral and tail fins 
for swimming; gills exposed on the posterior part of the back, or 
covered by a small hyaline shell. 
- Genus, CARINARIA—Lamark. 
Animal large, translucent, granulated; ventral fin rounded ; tail 
large, compressed ; gills numerous, pinnate, projecting from beneath the 
