gastropoda (tectibranchia, nudibranchia). Moll. 59 
tentacles ; jaws well developed ; radula with three rows of rhachidian 
teeth, broad bilobed inner lateral teeth, and two rows of small hook- 
shaped outer lateral teeth ; eleven teeth in one row ; gill large, attached 
to the inner surface of the mantle on the left side of the neck, and 
extending over to right side, consisting of numerous lamella). A per- 
fect, but small specimen, 6 mm. long. Tr. Conn. Ac. v. pp. 540-542, 
pi. lviii. fig. 27, radula, fig. 27a, and P. U. S.Nat. Mus. v. pp. 337 & 338. 
Bullidje. 
Cylichna semisulcata, sp. n., Dunker, Moll. Jap. p. 163, pi. xiii. figs. 7-9, 
Japan. 
Cylichna ? dalli, sp. n., Yerrill, Tr. Conn. Ac. v. 542, and P. U. S. 
Nat. Mus. v. p. 336, New England, 335 & 266 fath. 
Diaphana gemma (Yerrill, 1880), New England ; id. 1. c. p. 543, pi. lviii. 
fig. 22. 
Hydatina inflata (Dkr.) ; Dunker, l. c. p. 162, pi. ii. figs. 14-16, Japan. 
Philine amabilis (Yerrill) and tincta, sp. n., Yerrill, l. c. p. 544, the 
former, pi. lviii. figs. 23 & 24, the latter also P. U. S. Nat. Mus. v. p. 337, 
New England. 
Aplysiid^j. 
Notarckus punctatus (Phil.). A nearly microscopical internal shell, 
1 mm. long, found in it by A. Yayssiere, J. de Conch, xxx. pp. 271-273. 
Aplysia hamiltoni , sp. n., Kirk, Tr. N. Z. Inst. xiv. p. 283, Napier. 
Pleurobranchid®. 
Umbrella and Tylodina : nucleus spiral and heterostrophic ; Jeffreys, 
P. Z. S. 1882, p. 673. 
Pleurobranchcca tarda (Yerrill, 1880), New England ; Yerrill, Tr. 
Conn. Ac. v. p. 546, pi. lviii. fig. 26. 
Koonsia , g. n. Head, tentacles, proboscis, and gill as in Pleurobranchcca. 
Back swollen and overhanging with a distinct mantle-edge all round ; 
foot narrow, prolonged posteriorly, with a glandular groove near the end 
beneath, and a conical papilla above, near the tip ; verge armed with 
small hooks. K. obesa, sp. n., off Martha’s Yineyard, 216--258 fath., and 
off Delaware Bay, 312 fath.; Yerrill, Tr. Conn. Ac. v. (July, 1882) 
p. 545, and P. U. S. Nat. Mus. v. pp. 338 & 339. 
NUDIBRANCHIA. 
DoRIDIDiE. 
I 
Doris complanata (Yerrill, 1880), New England ; Yerrill, Tr. Conn. 
Ac. v. p. 549, pi. lviii. fig. 34. 
Doris welling tonensis (Abraham) radula ; Hutton, Tr. N. Z. Inst. xiv. 
p. 166, pi. vi. fig. G. 
