304 THE ZOOLOGIST. 
In the carapace of this species the lower sides are developed 
into rounded bosses armed with a stout spine, and between them 
there is a smaller prominence with another spine. The anterior 
portion is armed with four small tubercles placed in a row. This 
is a characteristic mark of the species. The abdominal segments 
have a ridge dividing them centrally. Those of the female are 
very broad, affording great protection to the ova; those of the male 
widening at the third and fourth joints, and slightly at the last. 
The rostrum is stunted and notched centrally, widening more than 
that of the two following species; this is another specific distinc- 
tion. The eyes are retractile, or rather can be turned back into 
their orbit-cavities, and are protected by spines on the anterior 
and posterior margins of the orbits. The antenne are very short, 
the movable portion extremely so. The legs are elongated, and 
the anterior pair in the male developed into stout pincers or 
forceps, which are but small and insignificant in the female. 
This species is pretty generally distributed, and appears to 
affect both deep and moderately shallow water. M. Milne- 
Edwards, under the name of scorpio, speaks of it as inhabiting 
the shores of the ‘‘ channel” and the “ ocean.” We have obtained 
it in considerable numbers from various parts of the English 
Channel, principally off the Sussex and Dorset coasts; some 
females that we obtained from Weymouth in December were with 
immature ova. It has also been recorded from St. Andrews 
(occasionally), Shetland (very rare), Galway (common), Belfast, 
Dublin Bay (thrown up after storms), Hebrides, Plymouth, and 
Hastings, while Fabricius found it in the Norwegian seas. 
Couch states that it is taken commonly in crab-pots, Cornwall; 
and Professor Wyville Thompson (‘ Depths of the Sea,’ p. 181) 
speaks of Inachus dorsettensis as occurring in deep water, as also 
did Capt. Beechey, R.N., who is stated to have brought up a 
specimen alive from a depth of 140 fathoms in the Mull of Gal- 
loway. It thus appears to be a fairly well-distributed species, 
and, from our own experience, we should advise collectors to 
examine catches of Stenorhynchus, as this species sometimes 
occurs with them. 
The ova of this species are very similar to, though somewhat 
larger than, that of the genus Stenorhynchus; they are of an 
orange colour deepening to a rich red as development of the yelk 
proceeds. 
