ME. E. J. MIEES ON THE IDOTEID.E. 51 



gated. Epimera small, in the second segment occupying, in a 

 lateral view, only the anterior half of tlie lateral margins, in the 

 second and tliird segments tlie middle portion of the lateral 

 margins, in tlie fifth and sixth segments they reach nearly, and in 

 the seventh segment quite, to the postero-lateral angles. Distal 

 plates of the opecrulum four-sided, with their posterior margins 

 truncated. Length about ly^^inch (40millim.). 



jHfiS. Malabar (M. Dussumier). 



The description is taken from the type in the collection of the 

 Paris Museum, which is an adult male, and is the only specimen 

 I have seen. In it the flagellum of one antenna is broken. 



The Idotea Latreillei of Guerin-Meneville, from the Cape of 

 Good Hope, is apparently distinguished merely by the longer 

 flagellum of the antennae (which is longer than the peduncle) ; 

 the legs are described as slender, and there is a deep longitudinal 

 median groove on the upper surface of the terminal postabdominal 

 segment. It may be distinct ; but I am inclined to regard this 

 species as identical with I. indica. I. indica is distinguished from 

 /. linearis by its much broader body, non-projecting epimera, 

 and much shorter antennae. 



III. Postaldomen composed of two distinct segments {visible 

 in a dorsal vieiv). 



The species of this section of the genus may be distinguished 

 as follows :— 



* Terminal segment emarginate at its distal end. 



Oblong-ovate : epimera well developed, in the sixth thoracic 

 segment occupying the whole of the lateral margins of the 

 segment. 1. I. ungulata (Pallas). 



Slender, with suhparallel sides : epimera very narrow, of the 

 sixth segment occupying a very small portion of the thoracic 

 segment. 2. I. elongata, Miers. 



Slender : epimera forming with the laterally produced margins 

 of the thoracic segments distinct rounded lobes. 



3. I. ?o5«^«. White (e'/eet?.), Miers. 



** Terminal segment suhtriangulate at its distal end. 



Subobloug : epimera narrow. 



4. I. Peronii, M.-Edwards. 



4* 



