20 T. V. HODGSON. 



CIROLANA. 



Another of Leach's genera, established in 1818 and now containing about- thirty 

 species from all oceans. The following species has not been previously recorded. 



CIROLANA MERIDIONALLS. 



(Plate III.) 

 Specific characters : 



Fifth segment of the nietasome narrower than the preceding one, but the lateral margins are not 

 covered by the fourth segment. 

 No eyes. 



The total length of the animal is 35 mm., its width 15 mm. The cephalosome 

 is very strongly marked off from the body and no trace of eyes can be discerned. 

 Its anterior margin is rounded but slightly, excavated for the origin of the first 

 antenna, between which there is a small rostrum, it is unevenly rounded laterally and 

 the posterior border is incurved to a slight extent. 



The mesosome is quite smooth, in life rather thickly spotted with light yellowish 

 spots on the brown ground colour. The seven segments are distinct, the first is the 

 longest, but owing to the curvature of the body it is foreshortened in the figure and 

 partially encloses the cephalosome ; the second is about half the length ; the others, 

 up to the fifth, progressively increase in length ; the sixth is very little shorter, and 

 the seventh shorter still. Except on the first the epimera are distinct from their 

 respective segments, increasing in size to the fifth and, again except the first, pointed 

 posteriorly. 



The nietasome comprises six segments, of which the last is fused with the telson. 

 The first segment is very short, the others progressively decrease in width, the fourth 

 to some extent overlapping the fifth laterally. The epimera of the four anterior 

 segments progressively increase in size from the first and are acutely pointed. 



The telson is broad and rounded, but terminating in the middle line in a small 

 projection. Its distal margin is setose. 



The uropoda are large ; the short and stout protopodite has its inner angle 

 produced as a spur and bears a narrow leaf-like exopodite setose all round ; the 

 endopodite is really about the same length but broader and similarly setose ; it- 

 projects just beyond the end of the telson. 



The first antenna has a three-jointed peduncle, the first is very short and stout, 

 the second less stout and shorter, the third is as long as the other two together. 

 The riagellum is twice the length of the last joint of the peduncle and consists of a 

 number of stout but very short ill-defined joints. Its anterior margin bears a number 

 of stout setae ; at first sight these look to be more like spines, but they are certainly 

 of a sensory character. 



