58 NAVANAX. 



N. INERMIS Cooper. PI. 15, figs. 89, 90, 91, 92, 93. 



Back of the body, foot and outside of pleuropodia wine-purple, 

 ornamented with rounded or oblong spots of yellow ; inner sides of 

 pleuropodia flesh colored. Free edges of pleuropodial lobes and 

 inner edges of the tail lobes and rhinophores orange colored with 

 adjacent band and alternating spots of blue ; lower side of tail-lobes 

 purple-blue; eye-patches white with black centers. Length 3, 

 breadth of body proper f inch (living animal). 



Shell quite thin and completely flexible, brownish-yellow, without 

 trace of calcification. As near as could be ascertained its form is 

 as in N. cenigmaticus and Aglaja depicta. Its position is as in Aglaja. 

 Penis (pi. 15, f. 89) similar to that of the Aglajas in general char- 

 acters. 



San Diego Say (Cooper) ; Catalina Island (Cooper, Dall). 



Strategus inermis COOPER, Proc. Cal. Acad., ii, p. 202. Navar- 

 chus inermis COOPER, Proc. Cal. Acad., iii, p. 58. BERGH, BulL 

 Mus. Comp. Zool., xxv, p. 214, pi. 10, f. 13 ; pi. 11, f. 2-5. 



The alcoholic specimen examined by Bergh was light coffee- 

 brown above with many yellowish-white lines, streaks and spots, 

 the sole black with a slight brown tinge, spotted throughout with 

 large, small and minute rounded yellow spots, coalescing on the 

 median line to form a band. 



N. ^NIGMATICUS Bergh. PI. 14, figs. 79, 80 ; pi. 15, figs. 86, 87, 

 88 ; pi. 6, fig. 39. 



Length 25, alt. 10, breadth 10 mill. Color dirty light yellowish- 

 white, strongly and irregularly marbled and dotted with black and 

 gray, most so on sole. Outer half of inner side of pleuropodia uni- 

 form white the entire length ; inner half brown-gray. Outer edge 

 with numerous black flecks ; gill yellow. Form perhaps narrower 

 than in the true Doridiums. The projecting, slightly concave an- 

 terior border of head is produced on each side in a tentacular hook 

 below the rhinophores (pi. 15, f. 87). Rhinophores rolled as in 

 Pleurobranchus. Posterior shield a little longer than the anterior, 

 its front edge but little raised. The hind edge of the shield seems 

 to have a narrow free edge projecting above the tails (pi. 6, fig. 39, 

 dorsal view of animal) ; but this may be a result of contraction. 

 The tail-wings are somewhat as in Aglaja depicta, united above, sep- 

 arated below. 



