[23] ALBATROSS EXPLORATIONS. 525 
V., which constructs flat, free tubes, about 2 inches long, out of broken 
bivalves, often occurs in vast numbers in the warm zone. 
A large and conspicuous, smooth, orange-red scaly annelid (Polynoé 
aurantiaca V., fig. 173), lives as a commensal among the tentacles of Bolo- 
cera Tuedie ; and another species of this group (P. Acanelle V., fig. 172, 
a—c), is very abundant among the branches of Acanella Normani. It has 
a dark purple proboscis and finely spinulose scales. Numerous small 
species of many genera have been taken at great depths. 
Several other interesting deep-sea annelids are illustrated on the 
plates (figs. 172-190). 
GEPHYREA. 
Several large and remarkable species of Gephyrea have been taken 
in deep water, but they are not yet determined. Among them there is 
a large strongly sulcated species (fig. 192), taken in 707 to 1,060 fathoms, 
which is often 3 to 5 inches long and nearly an inch in diameter, in alcohol. 
Another equally large species, from 858 to 1,168 fathoms, is covered 
with large warts or verruce. Both of these appear to be species of 
Phascolosoma. There is alarge Priapulus (fig. 191, a) from 1,000 fathoms, 
and a small one from 1,060 fathoms. <A large Thalassema occurred in 
1,600 fathoms. 
NEMERTEANS. 
The nemertean worms are not common in deep water, and but few 
species have been taken in our deep-water dredgings. The largest and 
most interesting one is a bright orange species, which grows to the 
length of 10 feet or more, and is about a third of an inch in diameter. 
It occurred in 192 fathoms, and is identical with Macronemertes gigantea 
Verrill, originally from the Gulf of Maine. Cerebratulus luridus V. (fig. 
195) occurred in 64 to 192 fathoms. 
MOLLUSCA. 
The Mollusca were very numerous and proved to be of even greater 
interest than those previously taken by the “ Fish Hawk.” The num- 
ber of species of Mollusca added to the fauna of this region by the “A1- 
batross” in 1883 was more than 150, of which over 80 were undescribed.* 
Four new forms of Cephalopods were taken, including two new gen- 
era. One of these, from 2,949 fathoms, isan Octopod (Hledonella pyg- 
mea V.), allied to Hledone, but peculiar in having the suckers singu- 
larly enlarged and altered in form on the hectocotylized arm (fig. 64). 
Another, from 1,731 fathoms, is a small squid (Leptoteuthis diaphana 
V., fig. 62), remarkable for its slenderness and transparency and for its 
* Most of these new species are described by the writer in the Transactions of the 
Connecticut Academy, vol. vi, 1884, with figures. 
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