OP CONCHOLOGY. 
37 
Other organs. — The eyes in this species are exceedingly 
minute, so as to he invisible to thenaked eye unless well trained. 
They are circular and deep seated. In alcoholic specimens thè 
skin must he carefully shaved away and examined by transmitted 
light in order to find them at all. They can he of little reai use 
to thè mollusk, as vision must be out of thè question, and they 
can hardiy be more than sensible to light and darkness. No 
organs of hearing were detected. 
This dissection does not agree with thè figures of Quoy 
{S. Diemenensis), which, as is thè case with many of Quoy’s 
figures, seem to owe a good deal to thè imagination of thè artist. 
I am inclined to refer thè differences, especially those of thè 
genitalia, rather to this cause than to any reai differences of 
structure between thè species. 
SiPHONARiA PELTOIDES, Dall ex Cpr. Piate 4, fig. 11, a, b.' 
JSfaeella peltoides, Cpr., Ann. and Mag. Nat. Hist. 1864, i, p. 
474, No. 15. Sup. Rep. Br. Ass. 1863, pp. 418 and 545. 
Nacella, sp. indet., Cpr., Maz. Cat. No. 262, p. 202. Rep. 
Br. Assoc. 1856, p. 252. 
Nacellai?) subspiralis, Cpr., Proc. Cai. Acad. Sci. iii, p. 213, 
1866. Sup. Rep. Br. Assoc. 1863, p. 612, No. 65; p. 
650, No. 240 (name only). Coop. Geogr. Cat. Cai. Moli, 
p. 23, No. 443, 1867. 
Macella ? vernalis, Dall, MSS. 1866. Stearns, Shells of Pu- 
rissima and Lobitas, Proc. Cai. Ac. Sci. Voi. iii. p. 345, 
1867. Hepburn’s Shells, do., p. 284. Shells of Santa 
Barbara, do., p. 344. 
S. testa tenuissima, conica, parva ; vertice subacuto, subpos- 
tico ; Isevi seu interdum costulis paucis, obsoletis radiatim vix 
ornata; epidermide tenui subfusco seu viridi clari, non laevi, 
fugaci; costa pulmonali intus et extus valde inconspicua; testa, 
extus subfusco cum luteo-virido radiatim; intus laevissime. Lon. 
•48, Lat. ‘36, Alt. 23 in. 
Habitat, Monterey, Purissima, Lobitas, Santa Barbara and 
San Diego, California. Gallapagos Islands, Dr. Hable. Maza- 
tlan (Reigen coll.), Cpr. Cape St. Lucas, Xantus. Catalina 
Id., Cooper, 6 — 10 fms., dead. 
Shell small, thin, conical ; apex recurved, nearly in thè median 
line, more or less acutely pointed ; generally somewhat eroded 
in old specimens. Epidermis thin, not polished, smooth, brown- 
ish red on thè apex and in dead shells ; in fresh or young indi- 
viduai of a ^right grass green, somewhat wrinkled and fre- 
quently overlapping thè border of thè shell ; fugacious. Shell 
smooth, reddish brown, with fifteen or more light yellow green 
