126 DOLABRIFERA. 
D. sowERBYI Guilding. PI. 34, figs. 9, 10. 
Soft parts unknown. Shell tortuous, subtrigonal, beak tortuous, 
thrown backwards, produced, apex small; basal margin rather 
straight, upper margin concave, external margin sinuated below the 
middle, roundly acuminated at the end ; disk centrally depressed at 
the back. (Sowb.) 
St. Vincent, West Indies. 
Dolabrifera sowerbyi (‘‘ Guilding Zool. Journ.” according to Sow- 
erby, but not in the Zoological Journal), Sows., Conch. Icon., xvi, 
pl. i ste2: } 
The tortuous depression in the dorsal disk, and the acuminate 
termination of the outer margin distinguish this species. (Sowb.) 
D. (?) orNATA Swainson. Unfigured. 
Swainson has given an imperfect description from an unpublished 
colored drawing by Guilding, of a species perhaps belonging to this 
genus. The locality is unknown, but probably St. Vincent, West 
Indies. As none of the important structural characters are known, 
the generic name will not stand, if the creature proves to belong to 
some known genus; but the species, on account of its brilliant col- 
oring, will probably be recognized sooner or later. It is not known 
whether the drawing was enlarged or natural size, so the dimensions 
given may prove incorrect. Swainson’s description here follows : 
Thallepus ornatus. Body more slender and fusiform [than 
Aplysia]; the lobes of the mantle [pleuropodial lobes] short and 
incapable of being used for swimming; tentacula two, large, ear- 
shaped ; eyes not visible; lower pair of tentacula wanting. A most 
beautiful figure of a species to which I give this name, is among 
Guilding’s drawings, but without any description ; it was evidently 
finished from the living animal. The general color is sea-green, — 
covered with minute black and white dots. The edges or crests of 
the reflected mantle [pleuropodia] have a broad edging of the 
richest orange, bordered on their outer edge with a line of deep 
black ; the tentacula are also orange, and formed like those of 
Aplysia. Total length about 32 inches. The only memorandum 
on the drawing is “ eyes not visible.” Whether this had any cover- 
ing over the branchia I have no means of judging (Swains., Treatise © 
on Malacology, or Shells and Shell-fish, pp. 250, 359. 1840). 
This form may prove to be the same as one of the West Indian 
species known from the shell only. . 
