NARRATIVE OF THE CRUISE. 
881 
instead of being firm and opaque like other Crustacea, appeared to be almost entirely 
uncalcified ; indeed the only parts of the body at all hard and resistant are the mouth 
appendages and, though to a considerably less extent, the ambulatory limbs ; the 
integument is naturally extremely transparent ; it might perhaps be imagined that this 
specimen has but just shed its skin, but the presence of a colony of well developed 
Hydroids attached to the body seems to negative this possibility ; the floor of the ocean 
at the locality where this specimen was dredged is composed of Globigerina ooze, and 
there is therefore no lack of calcareous salts which might otherwise explain the anomalous 
condition of the integument in this Isopod. At another Station in the Antarctic a 
somewhat similar Munnopsid was dredged, but in this species it is the abdomen only that 
is clear and transparent, and but little calcified ; the rest of the body is comparatively 
hard and opaque. 
“ Several species are remarkable for the great development of spines, and one example 
dredged at Station 157 (1950 fathoms) especially so ; the anterior part of the body (the 
abdomen is unfortunately lost) is furnished with a ring of long slender spines upon each 
segment a quarter of an inch or so in length. The excessive development of spines 
appears to be commonly met with among the deep-sea Isopoda ; the long spine-like 
epimera of the deep-sea Serolis have been already referred to, and in many of the 
Arcturids the tubercles on the surface of the body are prolonged into sharp spiniform 
processes, attaining in many cases a considerable length, while one species at least, 
allied to the Munnopsidse, has comparatively long and spiniform epimera analogous to those 
of Serolis. None of the Munnopsidse possess eyes, but the deep-sea Arcturidee in every 
case have well-developed eyes, strongly pigmented. 
“ Of the Cymothoadse one example was dredged in deep water (Station 218, 1070 
fathoms) which is of some interest ; this Isopod is remarkable for the fact that all the 
abdominal appendages are modified into foliaceous gill lamellae ; the terminal pair are in 
no way different from the five preceding pairs, whereas in other Isopoda. it is the general 
rule that this pair of appendages does not form branchial organs but swimming feet. 
Eyes are quite absent ; the anterior antennae are short and broad, consisting of two 
joints only ; the second pair of antennae have four joints and a terminal filament, and are 
much more slender; the first pair of thoracic appendages are clawed. The specimen 
measures about 70 mm. in length. The Challenger collection contains only one other 
species belonging to this family from deep water. 
“ The Sphaeromidae, judging from what is known at present, are but poorly represented 
in deep water ; only two examples, apparently a male and a female of the same species, 
were dredged at Station 218, 1070 fathoms. This species is evidently closely allied to 
the genus Ncesa, but is probably distinct ; the most noticeable peculiarity is that the .eyes 
are nearly abortive ; there is no pigment present, and the cornea is not clearly facetted. 
Of the Anthuridse one or two specimens were dredged in deep water. 
