124 DOLABRIFERA. 



Two specimens of the species here described are labelled as above 

 in the late Cumingian collection. The name is probably derived 

 from the coloring of the animal. (Sowb.) 



Species of West America, West Indies and Greenland. 

 D. NICARAGUANA n. sp. PI. 63, figs. 12, 13, 14, 15, 16. 



Alcoholic specimens measure, (a) length 40, breadth 21, alt. 16 

 mill.; (5) length 41, breadth 19, alt. 14 mill. Body plump, grad- 

 ually narrowed in front, broadly rounded behind ; sole very broad. 

 Surface smooth, or showing few scattered and minute teat-like warts 

 on the back. Tentacles and rhinophores very short, funnel-shaped, 

 but collapsed. Eyes, distinct black dots about midway between 

 rhinophores and tentacles. Dorsal slit far behind the middle of 

 body, and to the right, short, about one-fourth the length of body, 

 gaping button-hole like at the two ends. Mantle small, imperforate, 

 not covering all of the gill ; the anus projecting as a large tube at 

 its posterior end. Genital orifice at forward end of gill. Opaline 

 gland opens to the left of the gill. 



Color (in alcohol) a uniform dirty cream or yellowish tint through- 

 out. 



Shell solid, narrow, regularly tapering from the rounded anterior 

 end to the obtuse apex, curved longitudinally, right margin convex, 

 left margin more or less concave. Outside concave, arcuate-striate, 

 partly covered with a brownish cuticle; inside heavily calloused and 

 convex along the middle, white. Apex with an irregular callus. 

 No sinus. Length 9i, breadth 3 mill. 



San Juan del Sur, Nicaragua (Dr. J, F. Bransford !) 



The shell is shaped somewhat as in D. oahouensis, but differs 

 notably from all other known species. In one specimen it is more 

 bent laterally (fig. 15). 



This is the only species of the genus known from the west coast of 

 the Americas. 



D. ASCIFERA Rang. PL 34, figs. 19, 20, 29, 17 ; pi. 65, figs. 10, 11. 



Animal 85 mill, long, of the same form as 0. dolabrifera, but the 

 back more rounded. Dorsal slit very small. Yellowish-brown, 

 with small obtuse tubercles. 



Shell more angular than D. dolabrifera, recurved, narrow, 'the 

 apex much calloused, enamelled, thick and callous, especially in the 

 middle. Length 9 mill. 



