NAVANAX. 57 
both sides with the dorsal colors intermixed. Length, 3 inches. 
{ Pse.). 
Station, among sea-weed on the coral reefs. They were very 
sluggish in confinement. One specimen, when placed in a glass jar, 
voided about a dozen small Bulle shells perfect. They differ but a 
trifle in color, some being darker than others. The foot always re- 
mains turned over on the sides of the body. (Pse.). 
Sandwich Is., among sea-weed on the coral reefs (Pse.). 
Philinopsis speciosa Psx., P. Z. S., 1860, p. 21. 
P. niGRA Pease. Unfigured. 
Oblong, slightly rugose above. Head-disk rather more than one- 
third of the length of the animal, oblong oval, acutely rounded in 
front and rounded posteriorly. The mantle lobe rather wider than 
head disk, of an oblong-oval shape, and the lateral ends of the trun- 
cation prolonged posteriorly into compressed crenate lobes, which 
are continued over the truncated portion, forming a slight crest. 
No visible eyes or tentacles. Shell buried in tbe truncated end. 
Foot elliptically oval, smooth, revolute laterally. Branchial plume 
single, situated on the right posterior end, and curving to the left. 
Color black, with two large white spots on anterior end, also two on 
the head-disk and two on the mantle lobe; sides white, and foot 
white, with three large black spots on each revolute side. (Pse.). 
Sandwich Is., on sea-weed in upper laminarian zone (Pse.). | 
Philinopsis nigra Pse., P. Z.S., 1860, p. 22. 
Genus NAVANAX Pilsbry, 1895. 
Strategus Cooper, Proe. Cal. Acad. Sci., ii, p. 202, (1862). Not 
Strategus Hope, 1837 (Coleoptera).—Navarchus CooPer, Proe. Cal. 
Acad., iii, p. 58, (1863). Not Navarchus de Fil. et Ver., 1857, (Pis- 
ces).—Navarchus Berecu, Mitth. Zool. Stat. Neap., 1893, p. 133; 
Bull. Mus. Comp. Zool., xxv, p. 213.—Navanax Pits., Nautilus, 
viii, p. 131 (March 1, 1895). 
Body elongated, similar in general characters to Aglaja, but an- 
terior angles of head-shield produced to form short involute rhino- 
phores. Shell asin Aglaja. Type NV. inermis Coop. 
Two species of this genus are known, both from west America. 
