10 DE. W. T. CALMAN ON NEW OH EAEE 



by ridges which rise at the corners into four prominent tubercles. There are no 

 transverse crests across the dorsal surface, but there is a well-marked, obscurely 

 granulated, median dorsal keel which rises at its posterior end into a blunt tooth. 

 The depressed area occupies the greater part of the lateral surface ; its upper margin 

 is sinuous and its posterior margin nearly parallel to the hinder margin of the carapace. 

 The lower horizontal ridge is produced in front and behind to the edge of the carapace, 

 and the upper is continued forwards on to the side of the pseudorostrum. The 

 greatest width of the carapace is measured between the postero-inferior tubercles. 

 The ocular lobe is little longer than broad and reaches nearly to the tip of the 

 pseudorostrum. The eye is without pigment ; there are about nine corneal facets. 



The first leg-bearing somite is almost entirely concealed, only a small portion being 

 visible laterally. The second is large, nearly equal in height to the carapace, with a 

 dorsal crest produced backwards into a sharp tooth and with the lateral plates 

 expanded. The posterior thoracic somites have a median dorsal keel, which is 

 continued on all the abdominal somites except the last. There are less distinct dorso- 

 lateral keels on the last two thoracic and the first two abdominal somites. The first 

 five abdominal somites have lateral articular processes anteriorly. 



The appendages are very similar to those of C. australis as figured by Sars. The 

 antennules are a little more slender and appear to lack all trace of the inner fiagellum. 

 The antennae have a long and slender external process which is not segmented off 

 from the basal part. The mandibles have about eighteen spines on the inner edge. 

 The lower lip has the tip of each lobe sharply bent inwards and armed with a group 

 of peculiar spatulate spines. The palp of the maxillula is about one and a half times 

 as long as the distance between its base and the tip of the distal lobe and bears two 

 long setse. 



The fiist maxilliped differs from that of C. australis in the longer basis, which exceeds 

 in length the other segments together. The terminal segment is very small. The 

 branchial apparatus is well developed ; the epipod is produced forwards nearly as far 

 as the end of the basis, and carries about thirteen branchial lobules. 



The second maxilliped is slender, its basis exceeding by two-thirds the length of 

 the remaining segments together. There are about twelve long setse on the basal 

 lamina. 



The third maxilliped has the basis sharply bent outwards about the middle of its 

 length. Otherwise it resembles the corresponding limb of C. australis. 



The first leg does not extend much beyond the tip of the pseudorostrum in the 

 natural position, and its distal segments are not so slender as in C. australis. 



The remaining legs are similar to those of C. australis, but carry longer setae. The 

 terminal segment of the second pair has three terminal but no lateral spines. 



The uropods have the peduncle stout and but little shorter than the last somite. 

 The rami are subequal and about equal in length to the peduncle. The endopod 



