ISOPODA. 53 



Metasome with one distinct segment sphiose and a bulbous urosome with minute 

 preterminal uropoda. 



Pereiopoda ambulatory, except the first, which is prehensile. 



Pleopoda, first pair forming an operculum over the remainder. 



This genus is established for two closely allied species which cannot be located in 

 any existing genera. It is unquestionably a member of the family Janiridse and its 

 nearest relations would appear to be the genera lolanthe Beddard, and Jalflfii Richardson. 



COULMANNIA ATJSTRALIS. 



(Plate IX., fig. 2.) 

 Specific characters : 



First segment of mesosome with epimera cleft to form two blade-like processes. 

 Urosome pointed. 



The body is 5 mm. long, vaulted with the elongated, though not separable, 

 epimera of the mesosome divided by a deep and wide cleft so as to produce them as 

 narrow blades. Each of these segments as well as the first of the metasome bears a 

 slight ridge produced in the mid-dorsal line into a stout backwardly curved spine. 

 The entire body is covered, but not thickly, with fine setse. 



The cephalosome is a little longer than the first segment of the mesosome, 

 rounded in front and having, near the posterolateral angle, a slender finger-like 

 process which carries a small eye. The posterior margin is very nearly straight. 



The first four segments of the mesosome are subequal in length, the third is the 

 widest, and the epimeral blades of this and the succeeding are subequal in size, those 

 of the first two segments graduate from the first to the fourth. The mid-dorsal 

 spines are well in front of the posterior border of their respective segments. The last 

 three segments are more or less curved backwards, particularly the last, though in the 

 last segment it would be more correct to say angulated. Their dorsal spines are on 

 the posterior border of their segments. The first and only distinct segment of the 

 metasome is quite small and wedged in the curvature of the preceding one. Its 

 mid-dorsal spine, though not so large, is quite as prominent as any of the others. 

 The urosome is smooth, finely setose and peg-top shaped. 



The uropoda are quite small, single jointed finger-like processes with a few 

 distal setse. They lie at five-eighths of the length of the urosome. 



The first antenna arises just in front of the eyestalk. The peduncle consists of 

 two small joints, and seen from the dorsum these are subequal in length, though the 

 first is very much stouter than the second. The multi-articulate fiagellum is twice the 

 length of the peduncle, and is composed of joints of very variable length and almost 

 devoid of setse. 



The second antenna is longer, and has a peduncle of six joints. The first two are 

 extremely short ; the third is longer than the two first together, swollen externally and 

 setose ; the fourth is short, forming a sort of elbow in the appendage ; the other two 



