BY W. A. EASWELL, M.A., B.Sc. 187 



which, is truncate. First segment of the abdomen short, with 

 well-marked divisional lines. Last segment convex, marked in 

 the middle line near the proximal border with a faint key-hole- 

 shaped depression, surrounded by a very obscure, granular 

 elevation ; terminal notch with a prominent narrow, clavate, mesial 

 process. Inner antennre separated at the base by a very small 

 frontal process ; basal segment of peduncle broad ; second shorter 

 and narrower ; third slender, cylindrical, longer than the second, 

 but not quite so long as the first and second together ; flagellum 

 rather longer than the peduncle. Outer antennas with the peduncle 

 stout, last joint the longest, flage}' am nearly twice as long as the 

 peduncle. Rami of the uropodf thin and leaf -like, immobile 

 ramus falciform with a trunca^ i apex ; mobile ramus ovate- 

 lanceolate in outline, concave upwards with a raised margin, much 

 longer than the inner, and extending far beyond the extremity of 

 the abdomen. 



Female. — Differs from the male mainly (1) in wanting the 

 posterior prolongation of the last thoracic segment, (2) in the 

 absence of the terminal notch (3) in the smaller size of the uropoda 

 the rami of which are nearly equal, the mobile ramus being 

 capable of being entirely concealed under the inner. 



A common species in Port Philip ; also found in Tasmania. 



I have placed this and the following species in the same genus 

 with Zumra diadema and Z. semi-punctata of Leach,* all three 

 being characterised by the prolongation backwards of the last 

 segment of the thorax in the male, and by the possession of a 

 posterior mesial notch occupied by a slight median process. Both 

 the species herein described have the outer ramus of the uropoda 

 capable of folding underneath the inner. The present species 

 differs from Z. semi-punctata in the process of the last thoracic 

 segment not being granulous at the base or punctated above, and 

 in having the outer ramus of the uropoda truncate instead of 



* Dictionnaire des Sciences Naturelles, tome xii., p. 344. 



