49 THREE CRUISES OF THE “BLAKE.” 
sea-anemone and a crab from shallow water was already known, 
the polyp deriving most of its food from the remnants left by 
the crab, and the latter 
in its turn being hidden 
by the Actinia while 
creeping towards its 
prey. 
Ostraconotus spatu- 
lipes, dredged from a 
little over 100 fathoms, 
is apparently the most 
aberrant of all the her- 
mit-crabs. It appears 
to live without a house; 
the carapace is flexible, 
and resembles that of the Galatheoidea; the tail is so rudi- 
mentary that the bunches of eggs are supported by the feet. 
The large number of Galatheoidea discovered is another 
prominent feature of the * Blake" collection. "They were pre- 
viously represented in our fauna by one imperfectly known spe- 
cles. They are very characteristic of deep water in depths of 
from 300 to more than 2,000 fathoms. "This group of species 
is well illustrated by Munidopsis rostrata. (Fig. 237.) Some 
of the Galatheoidea have enormously long legs, with which to 
hunt for their prey in deep mud or in hidden corner s, Munida. 
(Fig. 238.) Some of the small and weak forms of the group, 
Diptychus, are exceedingly abundant in 100 to 700 fathoms 
among the branches of gorgonians, and others in the interior of 
some of the delicate siliceous sponges; they appear greatly dis- 
turbed, running in all directions, when brought to the surface. 
None of the deep-water Macrura have attracted more notice 
than the Eryonide, or “Willemasia group of crustacea,” first 
brought into prominent notice by the “Challenger” expedition. 
No less than five new species of this group were discovered at 
depths ranging from 100 to 1,900 fathoms; they are admi- 
rably illustrated by Pentacheles sculptus. (Fig. 239.) The 
eyes are sessile and peculiarly modified in all the species. In 
Pentacheles sculptus the eyes, or ophthalmic lobes rather, com- 
Fig. 236. — Catapagurus Sharreri. 2. (S. I. Smith.) 
