MARINE MOLLUSCA OF THE UNITED STATES. 109 
2. D. TENELLA Agassiz. Fig. 221. 
Gould. Invert. Mass., 2d edit. 229, t. 20, f. 289, 290, 293. 1870. 
Body ovate, covered with small, pointed tubercles, yellowish- 
white; branchial plumes six to seven, simple; mantle extended 
anteriorly beyond the foot, head dilated laterally. 
Length half an inch, breadth three-eighths of an inch. 
Massachusetis. 
This and the following species are both referred by Verrill (Am. 
Journ. Sci., ii. 407, 1870) to the genus Onchidoris, which differs 
from Doris partly in the gills being retractile into separate cavi- 
ties. 
3. D. aspeRA, Alder and Hancock. Fig. 222. 
Ann. Nat. Hist., ix. 32. 
D. pallida, Agassiz, Proc. Bost. Nat. Hist., iii. 191. 1849. 
Proctaporia fusca, Mérch. Greenl. Bloddyr, 6. 1857. 
Body elongated, sides parallel, ends equally rounded, covered 
with large mushroom-like tubercles, cream-colored; branchial 
plumes seven to eight, simple, retractile. 
Length half an inch, breadth one-fourth of an inch. 
Gould calls this species D. pallida, Agassiz, and writes (Invert. 
Mass, edit. ii. 230), “It is pretty certainly D. aspera, Alder and 
Hancock, but if the exhibition of a colored drawing is a valid 
claim, the name of Agassiz has precedence.” If the drawing had 
been published with a name attached to it, it would have secured 
priority, but as it was merely shown at a meeting of the Boston 
Society, the claim is simply ridiculous. 
Massachusetts. (Hur.) 
4. TD. TUBERCULATA, Cuvier, 180, 2, 1802. Fig. 223. 
D. diademata, Agassiz, Gould, Invert. Mass., 2d edit. 280, t. 21, f. 298, 300 
to 804. 1870. 
Body oblong-oval, slightly broader anteriorly, maroon-color, 
darkened on the sides by numerous dusky points, dark gray 
below; branchial plumes nine, simple; head short, concentric, 
pointed. 
Length one and a half inch, breadth nearly an inch. 
Massachusetts. 
5. D. REpANDA, Alder and Hancock. Fig. 224. 
Ann. Nat. Hist., ix. 32. 
Doris planulata, Stimpson, Invert. Grand Manan, 26, f. 14. 1853. 
Body broad, mantle extended beyond the foot, covered with 
