58 CAPRELLID®. 
constant being on the last three segments of the body, 
and such are figured by Kroyer. The head is rounded in 
front, and occasionally surmounted by a minute tubercle. 
The first segment of the body, which is confluent with 
the head, is rather long. The second is rather longer, 
while the three succeeding are somewhat shorter, and 
subequal in length. The superior antenne are not half 
the length of the animal. The inferior scarcely reach 
beyond the distal extremity of the second joint of the 
peduncle of the upper. The first pair of legs articulate 
with the body at the anterior extremity of the first seg- 
ment of the body. The second pair of legs articulate 
with the body behind the middle of the second segment: 
the hand is long and oval, the palm being distinctly 
defined by a strong tooth, and armed also near the 
middle with two others, the anterior of which is fre- 
quently less distinctly apparent than the posterior. All 
the remaining parts bear a very near resemblance to those 
of C. linearis. 
Dr. Leach describes this species (under the name of 
C. linearis) as being, when alive, of a brown colour, in- 
clining to cinereous, beautifully spotted with rust colour. 
All the specimens that we have examined of this 
species are certainly males, and we have a strong convic- 
tion that they are but fully-developed males of C. linearis, 
from the fact that the specimens which we have described 
as males of Caprella linearis only differ from those of C. 
lobata in having the first and second segments of the body 
shorter, these two segments being subject to vary in 
length, and probably increasing with age. Furthermore, 
we have never been able to determine the female of 
C. lobata. 
C. lobata is, moreover, generally associated with C. 
linearis, and will probably be found to exist all round the 
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