370 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [664] 
ACTON PUNCTO-STRIATA Stimpson. Plate XXV, fig. 165. 
Shells of New England, p. 51,1851; H. and A. Adams, Genera, vol. ii, p.5.  Tor- 
natella puncto-striata C. B. Adams, Boston Jour. Nat. Hist., vol. iii, p. 323, 
Plate 3, fig. 9, 1840; Gould, Invert., ed. i, p. 245, fig. 188; ed. ii, p. 224, fig. 515. 
Cape Cod to South Carolina. Vineyard Sound, and Buzzard’s Bay, 
not uncommon; Long Island Sound, rare; Huntington and Greenport, 
Long Island (S. Smith). 
DORIDELLA Verrill. 
Body smooth, oval, convex. Dorsal tentacles retractile, without 
sheaths. Head prominent, the lateral angles prolonged anteriorly as 
short oral palpi or tentacles. Foot broad, cordate. Branchiz tufted, 
situated near the posterior end, on the right side, in the groove between 
the mantle and foot. 
DORIDELLA OBSCURA Verrill. Plate XXV, figs.173 a,b. (p. 400.) . 
American Journal of Science, vol. 1, p. 408, figs. 2, 3, November, 1870. 
Body broad oval, 7.5™™ long and 5™" broad; back convex, smooth. 
Foot broad, cordate in front. Oral disk broad, emarginate or with con- 
cave outline in front; the angles somewhat produced, forming short, 
obtusely pointed, tentacle-like organs, which in extension project beyond 
the front edge of the mantle. Dorsal tentacles small, stout, retractile. 
The branchie consist of a tuft of slender filaments, usually concealed 
by the edge of the foot. Color of body dark brown, lighter toward the 
edge, as if covered with nearly confluent blackish or brown spots, the 
whitish ground-color showing between them; foot, oral disk, and dorsal 
tentacles white ; the central part of the body, beneath, with a three-lobed 
yellow spot due to the internal organs. Young specimens are flesh- 
color or yellowish brown above, specked with darker brown. 
Vineyard Sound and Long Island Sound to Great Egg Harbor, New 
Jersey. Savin Rock, at low-water, under stones; off South End, 4 to 5 
fathoms, shelly. 
NUDIBRANCHIATA. 
DorIs BIFIDA Verrill. Plate X XV, fig. 176. (page 307.) 
American Journal of Science, vol. 1, p. 406, 1870. 
Outline broad oval, widest anteriorly, about 25™" long by 12™™ broad, 
in extension; back very convex, mantle covered with numerous, scat- 
tered, small but prominent, pointed papillz. Tentacles rather long, 
thickest in the middle, the outer half strongly plicated with about twenty 
folds, but with a smooth tip, the base surrounded by small papille. 
Gills retractile into a single cavity, united together by a partial web, 
deeply frilled, much subdivided, bipinnate, the subdivisions fine and 
slender. Foot very broad, in extension projecting back beyond the 
mantle about a quarter of an inch, slightly tapering, rounded and 
slightly notched at theend. Oral disk or veil crescent-shaped, the front 
