FKOM THE INDO-PACIFIC AND WEST AFRICA. 315 



rostrum, reaching almost for their whole terminal joint beyond the peiluncles of the 

 external antennae. A third part of the carpus of tlie first pair of legs, that is 85 mm. 

 long, extends beyond the antennal scales, and the liands are 4i'5 mm. lonn". 



The right leg of the second pair is wanting, the left has been figured (fig. 55). 

 Measured along its upper or outer margin, the merus appears 12 ram. long and 6 mm. 

 thick in the middle, the carpus 135 mm. long and 525 nim. thick in the middle; the 

 palm is 17 mm. long, just half as broad (85 mm.), and 58 mm. tiiick in the middle, the 

 fingers finally are 12 5 ujm. hmg. The upper wnd inner sides of tlie palm are covered with 

 felt and with scattered soft longer hairs ; along the inner margin of the palm long, 

 slightly curved, acute spines are seen, wliich gradually grow smaller on the index towards 

 the tip. A second row of s|)ines occurs on the upper surface of the palm near and 

 parallel with that on the inner margin, and a few spines stand also on the upper and on 

 the lower surface of the immobile finger at its base ; a row of much shorter and more 

 numerous spines is ftmnd along the arcuate outer margin of the palm, and both upper 

 and lower surface of palm and fingers are beset with similar sliort spinules. The morus, 

 strongly swollen in the middle, bears acute, slightly curved spines on its inner surface, 

 as also the carpus, and these spines are arranged more or less distinctly in three or four 

 longitudinal rows. Similar, tliougii shorter, spines stand all round the carpus; on the 

 outer side, however, of the merus tliey are very short and small, so that the surface 

 appears here almost smooth, even under a feeble niagnifying-glass. The fingers are 

 armed with small rounded teeth along the whole length of their inner margins, 15 or 16 

 on the immobile and 12 or 13 on the other finger, with short hairs on each side of them. 

 The meropodites of the fiftii pair aie 7'5 mm. long and 12 mm. broad in tue middle on 

 their outer side. 



The numerous specimens that have been gathered in the river at Catumbella by 

 Mr. P. Kamerman, and presented l)y him to my collection, are all young and many 

 are of very small size. Tlie rostrum is rather variable as regards its form and the 

 number of teeth witli whiidi its margins are ai-med, as is proved by the following 

 descri[)tions and a glance at the Table of measurements. A short apical part of the rostrum 

 armed with one or two apical teeth, which are somewhat more distant from the prece'ling 

 than these are from each other, is constantly distinguishable ; and this apical part is 

 generally more or less tamed npwnnl. As regards the legs of the second pair, I wish 

 to remark that the palm appears less enlarged, when compared with the adult individual 

 from the River Prah, and also that the preceding joints present a more slender form than 

 in the adult. There can, however, lie no doubt that these specimens are really the young 

 oj P. Olfersii. 



The large male (No. 3 of the Table) is 12 mm. long from the tip of the rostrum to the 

 end of the telson. The rostrum, slightly convex above the eyes (fig. 56j, reaches almost 

 to the distal end of the scaphoceritos and is armed above with 11 teeth, of which 5 stand 

 on the cephalothorax ; the foremost tooth is smaller than the penultimate and situated 

 nearer to the apex than to that tooth. The lower margin of the rostrum is armed with 

 5 teeth on its distal half. The telson tapers strongly towards the posterior extremity, 

 which is long-pointed (fig. 57) ; the inner of the two spines on each side reaches considerably 



SECOND SERIES. — ZOOLOGY. VOL. IX. 45 



