228 J. G. DE Man : The Fauna of Brackish Ponds. [Voi.. II, 



tooth and the tip, which appears slightly concave in Car. syriaca, 

 appears in Car. propinqua straight and the rostrum is proximally 

 less concave. 



In another specimen nearly of the same size the rostrum of 

 which is broken off, four teeth are placed on the carapace. In the 

 third specimen, 19*5 mm. long, the rostrum is turned downward 

 from the base and reaches to the end of the second joint of the 

 antennular peduncle ; the rostrum — 2*5 mm. long from the tip to 

 the anterior margin of the carapace and 0*4 mm. high (broad) — has 

 the same form as in the first specimen. The upper margin carries 

 17 equidistant teeth, four of which are placed on the carapace ; 

 the foremost tooth is farther remote from the acute tip than in the 

 preceding specimen, its distance from the tip is nearly one-sixth the 

 length of the rostrum proper and as long as the space occupied by 

 the four anterior teeth together. The lower margin carries two teeth 

 on its anterior half ; these teeth, smaller again than those of the 

 upper margin, are situated just below the foremost and the pen- 

 ultimate tooth of the latter. 



The fourth specimen is much younger, being 13*5 mm. long. 

 The rostrum, little longer than the first joint, rises at first a little 

 upward, but soon curves downward and has, therefore, another 

 shape than in the preceding specimens. There are again 17 teeth 

 on the upper margin, four of which are on the carapace ; the distance 

 between the foremost tooth and the tip measures one-seventh the 

 length of the rostrum proper. The rostrum appears a little less 

 broad (high) than in the preceding specimens, its height being only 

 one-eighth of its length. There is but one small tooth on the 

 lower margin, situated just below the penultimate tooth of the 

 upper. 



Unfortunately in the youngest specimen, 10 mm. long, the 

 tip of the rostrum is broken off, the existing part reaches quite 

 horizontally to the end of the first joint of the antennular peduncle 

 and carries 16 teeth, five of which are on the carapace ; the lower 

 margin bears two teeth. The telson of the third specimen carries, 

 on the posterior third of its upper surface, two pairs of spinules, 

 the posterior spinule on the left side is wanting ; the triangular 

 tip carries at either side four or five spinules, the first of which, at 

 the outer angles, is as usual the shortest, the second the longest, 

 0*3 mm. long, the third 0*24 mm. long, the fourth 0"i6 mm. The 

 telson (fig. 6a) of the second specimen carries at its posterior extrem- 

 ity at the right side six, at the left seven spinules (fig. 6b), the 

 first small spine at the left angle being apparently supernumerary. 

 The upper surface carries two pairs of spinules, but one spinule at 

 the right side is wanting. The telson of the largest specimen carries 

 three pairs of spinules above, the anterior pair placed somewhat 

 nearer to the base than to the tip of the telson. 



Antennular peduncle reaching to the middle of the distal 

 spine of the antennal scales, shorter therefore than the latter. 

 The first joint, i.e., the distance between the anterior margin of the 

 carapace and the far end of this joint, is slightly longer than the 



