256 , THE SCHIZOPODA. 



lobe therefore overlapping a very small portion of the next joint; the inner tooth 

 of the lobe is generally longer and stouter than the outer. Second joint conspicu- 

 ously longer than third, with its dorsal wall produced feebly in front above the 

 base of third joint and the ujiper terminal margin near the outer side produced 

 in a low, acute angle (fig. 3d); third joint, seen from the side (fig. 3c), with the 

 dorsal keel occupying somewhat more than half of the upper margin, moderately 

 high and increasing in height to the end which in well-preserved specimens is 

 produced in an acute denticle, while the front margin is steep, not quite vertical. — 

 The antennal squama somewhat broad, with the terminal margin of iniddle 

 length, transverse, without tooth at the outer margin. The spiniform process 

 from the outer side of the peduncle short, less than one fourth or one fifth as 

 long as the squama. 



First and second abdominal segments at the iniddle of the upper posterior 

 margin a little produced, but the protuberance is broadly rounded. Third seg- 

 ment a little expanded backwards at the middle of the hind margin and pro- 

 duced in a somewhat short, strong, conspicuously compressed, acute process, 

 which has the upper margin a little curved, the lower straight, and the process 

 is continued a little forwards as a keel. Fourth and fifth segments with the 

 hind margin distinctly produced in the median line, forming either a sharp 

 angle or a very short denticle. Sixth segment moderately long, somewhat 

 less than twice as long as deep. Preanal spine wanting in both sexes. — Uropods 

 with the rami subequal in length and as long as, or a httle shorter than, the 

 telson. 



The copulatory organs (figs. 3e-3g) differ in several features from those in 

 allied forms. The terminal process (p^.) with the foot moderately long, the heel 

 rather short but considerably curved, the part beyond the foot moderately long, 

 somewhat slender, proximally straight, distally curved considerably inwards 

 and forwards and with the terminal part a little expanded and flattened, very 

 oblong-oval with the end blunt. The proximal process (p'^.) is of very moderate 

 length; almost all the proximal half is rather stout and a little bent before its 

 middle; the distal half is bent strongly inwards and tapers considerably to not 

 far from the end, while the terminal portion is abruptly very much expanded, 

 seen from the inner side (fig. 3g) forming a broad plate bent strongly backwards 

 (in the figure therefore to the right), and with a sharp, protruding angle on its 

 proximal part ; seen from behind (fig. 3f) this terminal plate is oblong, somewhat 

 expanded upwards, and this expanded part seemingly proximally produced 

 into a long tooth crossing the posterior surface of the process and projecting 



