36 CHELIDONURA, CRYPTOPHTHALMUS. 
The snail crawls slowly, the posterior appendages usually being 
dragged straight out behind. On the front of the head on each lateral 
lobe and the neighboring sinuses stood numerous peculiar sense 
organs, appearing under the lens like bunches of bristles. They 
consist of flexible conical tubes (fig. 34, x 25, and figs. 33, 38, 
x 300) on the blunt distal ends of which is a bunch of many fine 
hairs. The free end of the tubes can be drawn in. Under the 
base of the bunch of hairs is an egg-shaped ganglicn (fig. 35) in 
which a nerve ends. The free end of the tube is exserted appar- 
ently by its circular muscles, or perhaps by ingress of blood. 
C. apamsi Angas. Vol. XV, pl. 59, fig. 14. 
Head furnished in front with a short silky fringe; mantle ter- 
minating behind in two long bifurcate filaments, foot elevated on 
each side, embracing the head and mantle, rounded both in front 
and behind; color velvet-black, with a white crescent on the 
hinder part of the mantle; the head and the outer edge of the foot 
are bordered with a line of brilliant blue; a line of the same color, 
bifurcated in front, extends down the back, and the posterior fila- 
ments are ornamented in the middle with a similar line; parallel 
with these blue lines, and at a short distance from them, are lines 
of a gold color; and spots of the same appear above the white cres- 
cent on the back, and at the bifurcation of the posterior filaments. 
Shell internal, very small, thin, flat, with the right border termina- 
ting ina point. Length 2 inches. (Ang.). 
Rock-pool at low water at Vancluse Bay, Port Jackson. 
©. adamsi Anc., P. Z. S., 1867, pp. 116, 227, pl. 13, f. 32. 
This species may be identical with the individual alluded to by 
Quoy as having been met with at the Mauritius among numerous 
specimens of his Bulla hirundinina, but which was not described by 
him. I have named it in honor of my friend, Mr. Arthur Adams, 
the founder of the genus Chelidonura. (Angas). 
Genus CRYPTOPHTHALMUS Ehrenberg, 1831. 
Cryptophthalmus EHRENB. Symb. Phys. Evert. 
Shell internal, minute, white, fragile, the left margin incurved in 
the middle, but not enrolled; body whorl expanded, produced in a 
pointed process above. 
Body elongated ; head shield small, truncate in front, bilobed be- 
hind, bearing minute, sessile eyes on its anterior surface; foot as 
