D@LABRIFERA. 125 
Saint Jeanne de Cayenne (type locality; Richard); St. Thomas, 
St. Croix (Riise, Oersted, Krebs). 
Aplysia (Dolabella) ascifera Rane, Hist. Nat. Aplys., p. 51, pl. 
4, f. 7-9.—Dolabrifera ascifera Morcu, Mal. BL. xxii, p. 176.— 
Sows., Conch. Icon., xvi, pl. 1, f. 6a, 6b. Beran, Verh. k.-k. zool.- 
bot. Gesellsch. in Wien., xxii, 1872, p. 441, pl. 5, f. 25-29; pl. 6, f. 
1-10 (anatomy). 
Externally of the same form as D. dolabrifera, but the back is 
more rounded; but distinguished by the yellowish-brown color of 
the surface which is strewn with numerous obtuse projections, like 
little warts. The dorsal slit is very small, mantle a little larger 
than in D. dolabrifera. The shell also shows sufficiently recogniz- 
able differential characters, being wider in the middle, more angular, 
and especially thicker in the center, which is calloused and enamel- 
led; the apex is more calloused and quite small. This shell is the 
most calcareous of the genus. It is perfectly white. 
Figures 19, 20, 29 are from the original illustrations of Rang. 
Fig. 17 is a smaller shell copied from Sowerby. My description is 
from Rang. 
The dentition has been worked out by Bergh from specimens col- 
lected by Riise. His figures are here reproduced. PI. 65, figs. 10, 11, 
shell; pl. 67, fig. 25, median and first lateral teeth; fig. 21, laterals 
from inner fifth of a row, from the side; fig. 24, laterals of the fol- 
lowing fifth, from above; fig. 22, laterals from the third fifth, viewed 
from the side; fig. 23, the outermost laterals. 
D. swirtit n.sp. PI. 67, figs. 19, 20. 
Soft partsunknown. Shell trapezoidal with projecting beak, well 
curved, moderately solid, but not much calloused within; white 
with thin yellowish cuticle. Sinus long, concave; left margin 
straight; basal or anterior margin truncated at a right angle with the 
left margin, and distinctly emarginate; right margin below the sinus 
parallel with the left, but gently convex. Beak obtuse, with a flat, 
callous extension, roughened and thickened on the ventral side. 
Length 11, breadth 52 mill. 
West Indies (R. Swift). 
The shell of this species somewhat resembles that of D. fusca, as 
figured by Pease, but the sinus is more equally concave, and the 
narrow extension of the beak longer. 
