378 MR. W. F. LANCHESTER ON THE [DeC. 2, 



swollen and coarsely reticulate laterally ; uropods just shorter 

 than the 6th segment ; rami equal, inwardly curved, and narrow, 

 the outer being a little broader than the inner. Distal end of 

 the crest on the last four thoracic legs increasing gradually in 

 height from before backwards; ungues of all the legs curved, 

 moderately long, and increasing in size backwards but only very 

 gradually, so that those of the last pair are only a little longer 

 than those of the first pair. 



Length 35 mm. ; breadth 17 mm. 



XVII. Genus Meinertia Stebbing, 



32. Meinertia carinata Schiodte & Meinert. 



Ceratothoa carinata Sch. & Mein. ISTaturhist. Tidsskr. iii. 13, 

 p. 327 (1883). 



Log. Great Redangs. Several specimens. 



XYIII. Genus Kerocila. 



33. Nerocila sundaica Bleeker, 



Nerocila sundaica Blkr. Crust. Ind. Arch. i. p. 26, fig. 4 ; Sch. 

 & Mem. Naturhist. Tidsskr. iii. 13, p. 9 (1881). 



Loc. ? A single female. 



Although the anal segment and uropods are much damaged, 

 there is no doubt in my mind that this specimen belongs to the 

 above species, presenting as it does three very characteristic 

 features : namely, the swollen basal joints of the first antennae, the 

 pectination of the 3rd and 6th-7th legs, and the constriction of 

 the ungues of the other legs. In two points, however, it differs ; 

 for the median concavity in the anterior margin of the first 

 segment is slightly deeper (not shallower) than the lateral, and 

 the first four abdominal segments are all subequal, the fifth being 

 only very slightly longer. 



XIX. Genus Rocinela Leach. 



34. Rocinela mundana, sp. nov. (Plate XXXY. figs. 9-9 a.) 



Tale Sab. " From the gills of a freshwater skate." 



Flagellum of 1st antennae 4-articulate, of 2nd antennae 

 1 2-articulate ; eyes distant, reniform, with the anterior end trun- 

 cate ; ocelli fairly large, numerous. 



Front bluntly triangular, projecting in front of the eyes, and 

 only just concealing the base of the 1st antenna; 1st thoracic 

 segment longer than the rest, which are subequal, its anterior 

 border trisinuate ; epimera small, increasing in size backwards, 

 the last just overlapping, with its blunt point, the posterior angle 

 of the last segment ; 1st abdominal segment partly concealed, 

 distinctly shorter than the rest ; its posterior border sinuate, those 

 of the rest becoming straighter towards the telson. 



Telson with a transverse swelling at the base on each side of 



