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 Bullse 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 PSE., 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 the 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. 



Strategic COOPER, Proc. Cal. Acad. Sci., ii, p. 202, (1862). Not 

 Strategus Hope, 1837 (Coleoptera). Navarchus COOPER, Proc. Cal. 

 Acad., iii, p. 58, (1863). Not Navarchus de Fil. et Ver., 1857, (Pis- 

 ces). Navarchus BERGH, Mitth. Zool. Stat. Neap., 1893, p. 133; 

 Bull. Mus. Comp. Zool., xxv, p. 213. Navanax PILS., 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 as in Aglaja. Type N. inermis Coop. 



Two species of this genus are known, both from west America. 



