[25] ALBATROSS EXPLORATIONS. 527 
V..& S. (fig. 96), Margarita regalis V. & S. (fig. 97), M. lamellosa V. & S. 
(fig. 98), and by several small species of Cyclostrema. A more peculiar 
group includes curious small limpet-shaped shells, not distantly allied 
to Fissurella, but imperforate at tip. Of these we now know 10 species 
from our deep dredgings. These belong to the genera Addisonia, 1 spe- 
cies; Cocculina, 6 species; Lepetella, 1 species; Propilidium, 2 species. 
The Tectibranchs are relatively abundant in deep water, one of the 
Shell-less species, Koonsia obesa V. (fig. 107), grows to a very large size, 
some examples being 4 to 5 inches long and 3 broad. large and 
handsome new Scaphander (S. nobilis V., fig. 106) was taken alive in 
1,058 to 1,309 fathoms. 
The Scaphopods are much more numerous in deep than in shallow 
water, and are abundantly represented by several species of Dentalium, 
Siphodentalium, and Cadulus (fig. 126). D. solidum, from 843 to 1,309 
fathoms, grows to the length of 34 inches. Cadulus grandis V. and another 
allied new species (C. princeps V.) are remarkably large representatives 
of this genus. The former lives in 816 to 1,537 fathoms, the latter in 
1,525 to 1,594 fathoms. 
Of Heteropoda, eight species were taken, including at least six species 
of Atlanta (figs. 110, 111). Part of these were only dredged as dead 
Shells, but others were taken alive at the surface. Two transparent 
species of Firola (fig. 112) and Firoloides were common at the surface, 
associated with Sagitta, which it somewhat resembles in shape. All 
these species, except one, and most of the twenty-three Pteropods have 
long been known from the more tropical parts of the Atlantic, but not 
from so far north. 
The bivalves or Lamellibranchs are relatively less abundant than in 
shallow water, and are less peculiar; but they include numerous species 
of the Anatinide and Corbulide (especially the genus Newra), the Nu- 
culide, including the genera Nucula, Leda, Yoldia, Glomus, Malletia, &e.; 
and the Arcide, including Arca and Limopsis. The Lucinide are also 
well represented by several species of Cryptodon (or Awinus) and other 
genera. Among the most peculiar forms are Pholadomya arata (figs. 
133, 134), Mytilimeria flexuosa (fig. 1382), Verticordia celata (fig. 131, a), 
and Poromya sublevis (fig. 128). Several species of Pecten and Amussium 
also occur, most of them with delicate, translucent, and elegantly sculp- 
tured shells (figs. 141, 142). 
Of the Brachiopoda we took two deep-sea species, both new to our 
coast, but known on the European side. These are Waldheimia cranium, 
in 1,362 fathoms, and Discina Atlantica, in 1,251 to 1,467 fathoms.* 
The accompanying tables will give an idea of the number and bathy- 
metrical distribution of the different groups of Mollusca. 
The writer’s published listt of the Mollusca taken in 1880 to 1883 by 

*An additional species was obtained in 1884: Atretia gnomon, in 1,525 to 1,594 
fathoms. 
t Transactions Connecticut Academy, vol. vi, p. 263, 1884. 
