526 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [24] 
very elongated head. The others are species of Octopus, from 142 and 
1,290 fathoms. 
Of Gastropods many new forms occurred. One of the most remarka- 
ble is a large shell, from 1,395 to 2,594 fathoms, the living ones only 
from below 2,000 fathoms, constituting a new genus (Benthodolium abys- 
sorum V., fig. 84, a, b), allied to Dolium, but having an operculum, and 
in form somewhat resembling Buccinum. Its animal and dentition are, 
however, like Dolium. There was also a thin and delicate Buceinum (B. 
abyssorum V., fig. 80) of good size, the live ones ranging from 906 to 
1,309 fathoms. Several interesting new forms of Sipho occurred. These 
are mostly small species, but some of them are of good size, as S. pro- 
fundicola V. (fig. 81), living in 1,525 to 2,574 fathoms. 
The curious and very beautifully sculptured shells belonging to the 
genus Seguenzia were among the most interesting forms. Two species 
were taken living. One of these is S. formosa Jefffreys (fig. 88), the 
other is a closely related new species, S. eritima V. (fig. 89). They 
both occurred several times in 1,290 to 2,033 fathoms. The possession 
of these species, with the animal preserved in alcohol, enabled,me to 
study the dentition, and thus ascertain the zoological affinities of the 
genus. It proves to belong to the Tznioglossa, somewhere near Apor- 
rhais and Fossarus, but evidently represents a new family (Seguenzide 
V.). It has no relationship whatever with Trochidz, where it had been 
put by Boog-Watson and by Dall, nor with Solaride, where it was lo- 
cated by Jeffreys and others. The resemblance to these widely diverse 
groups is confined entirely to the shell, which is, however, very peculiar. 
The Toxoglossa, as usual in deep water, were relatively very numer- 
ous, and included several handsomely sculptured new species belonging 
to Plewrotomella ‘and allied genera. The largest of these is P. Bairdii 
(fig. 68), which is the largest member of this group known off our coast. | 
It occurred living in 1,537 to 2,021 fathoms. Another remarkable and 
elegant species is P. Catherine (fig 76, a), from 843 to 2,033 fathoms. P. 
Benedicti (fig. 70, a), from 1,290 fathoms; P. Hmertoni (fig. 74), from 
1,917 fathoms ; and P. Bruneri (fig. 75), from 1,608 to 2,033 fathoms, are 
also handsome shells, with the elegant and delicate sculpture and trans- 
lucency characteristic of many deep-sea shells. 
The Chitons or Polyplacuphora are very scarce in deep water, perhaps 
owing to the small number of:suitable objects to which they can adhere, 
for even the small limpets are generally found in worm-tubes, empty 
skate’s eggs, or other similar places. Only five species of Chiton have 
been taken below 60 fathoms by us, and most of these also live in shallow 
water and do not go very deep. One wasa very interesting new species 
(Euplacophora Atlantica V., figs. 102, 102a) belonging to a group not 
known before from the Atlantic. It is remarkable for the very broad 
anterior girdle. 
The Rhiphidoglossa are well represented in deep water by several 
handsome species belonging to the Trochide, such as Calliostoma Bairdtt 
