DOLABRIFERA. 119 



D. cuvieri was originally proposed as a substitute for D. dolabri- 

 fera Cuv., evidently in order to avoid the duplication of names con- 

 sequent upon the recognition of Dolabrifera as a genus. The type 

 of D. dolabrifera, however, has a long shell (see pi. 34, figs. 12, 13), 

 and the square one figured by Adams apparently is specifically dis- 

 tinct. Possibly the shell figured by Rang as a monster of D. dola- 

 brifera is the same as H. & A. Adams' species. 



D. MAILLARDI Deshayes. PI. 34, figs. 26, 27. 



Soft parts unknown. Shell small, calcareo-corneous, elongated, 

 trigonal, a little arcuate longitudinally, terminating in a small cal- 

 lous posteriorly ; left margin straight, right margin rounded, the 

 sinus long and straight. Upper surface regularly concentrically 

 striated, lower surface with a thin shining callus; color yellowish- 

 white, corneous, semitransparent. Length 7, width 3 mill. 



Island of Bourbon (Reunion). 



D. maillardi DESK., Catal. Moll. Reunion, p. 53, pi. 7, f. 20-22 

 (1863). 



D. TRIANGULARIS Watson. PI. 65, figs. 7, 8. 



Soft parts unknown. Shell much arched, corrugated, porcella- 

 nous, dull, and scored on the upper surface with sharp strong lines 

 of growth, on the under surface lustrous and amorphous, with a 

 strong but irregular oblique longitudinal furrow and rough radiat- 

 ing lines toward the back ; it resembles the blade of a fleam, being 

 triangular, with a straight back, the handle (where the nucleus is) 

 in front, and the point (a bluntly rounded one) on the left. Round 

 the nucleus there is an amorphous expansion and thickening ; 

 across the blade obscure and unequal rays diverge from a point be- 

 hind the nucleus. The back of the blade is thick and blunt, the 

 other two sides are bluntly beveled to a sharp edge. Length 0'43, 

 width 0'21 ; height of arch O'l, greatest breadth behind 0'3 inch. 

 ( Watson]. 



Simons Bay, Cape of Good Hope, 15-20 fms. (Challenger). 



D. triangular is WATS., Journ. Linn. Soc. Lond., xvii, p. 346; 

 Challenger Gastrop, p. 673, pi. 50, f. 7. 



This species is much more attenuated in front than Dolabrifera 

 marmorea Pease from the Sandwich Islands, which otherwise it 

 much resembles in form and texture, whilst it is in sculpture much 

 more delicate. Dolabrifera maillardi Deshayes from the Island of 



