A. E. Verrill — Catalogue of Marine Mollusca. 
54V 
(240 specimens.) Off Chesapeake Bay, stations 896-900, in 31 to 300 
fathoms. In 1881 it occurred at twenty-six stations, off Martha’s 
Vineyard, in 28 to 310 fathoms. It was particularly abundant at 
stations 918 and 922, in 45 and 69 fathoms, (190 specimens). It is 
not common below 200 fathoms. Off Delaware Bay, stations 1043, 
104V, in 130 and 156 fathoms. 
With this species, and probably belonging to it, we often took 
gelatinous, but rather firm, cylindrical egg-clusters, about 20 mm long 
and 4 mni in diameter, with the eggs in several rows. 
Closely resembles Pleurobranchcea N~ovce-Zealandice in form and 
color. The latter is a littoral species. 
Doridella obscura Verrill. 
Doridella obscura Verrill, Amer. Journ. Sci., i, p. 408, figs. 2, 3, 1870; Rep. Invert. 
Anim. Vineyard Sd., in Rep. U. S. Fish Com., i, pp. 400, 664 (auth. cop., p. 
370), pi. 25, fig. 173, a, b, 1874. 
Figure 5. 
Long Island Sound, near New Haven, low-water 
mark to 5 fathoms ; Vineyard Sound, low-water 
to 10 fathoms; off Block Island, station 824, 13 
fathoms, 1880 ; Great Egg Harbor, N. J., 1 to 
2 fathoms, 1872. 
Fig. 5. 
N UDIBRANCHIATA. 
Issa lacera (Muller) Bergh. 
Triopa lacer Loven, Index Moll. Scand. Occid. [p. 6], 1846. 
G. 0. Sars, op. ult. cit., p. 311, pi. 27, figs. 4, a-c, pi. xiv, figs. 12a, b. 
Verrill, Amer. Journ. Sci., xvi, p. 211, Sept., 1878. 
Issa lacera Bergh, Monog. Polyceraden, II, p. 20, pi. 14, figs. 4-12, 1881, in Verh. 
K. K. Zool.-Bot. Gesellsch., Wien, 1880. . 
Plate XLII. figure 11. 
This was first, taken on our coast in 1873, by the II. S. Fish Com- 
mission party on the “ Bache,” at Cashe’s Ledge and off Cape Ann, 
in 25 to 80 fathoms. Off Halifax, Nova Scotia, 90 to 92 fathoms, 
and Massachusetts Bay, 35 to 48 fathoms, 1877 ; and off Cape Cod, in 
70 fathoms, 1879. 
Issa, ramosa Verrill and Emerton. 
Issa ramosa Verrill and Emerton, in Verrill, Amor. Journ. Sci., xxii, p. 301, 1881. 
Plate LVII1, figures 36, 36a. 
Stations 94o and 949, in 130 and 100 fathoms, 1881. 
Trans. Conn. Acad., Vol. V. • 66 
July, 1882. 
