DUTCH BORNEO-EXPEDITION. 145 



a comparatively small number of large eggs, 

 which are 2 — 2,5 mm. long and 1,4 — 1,7 mm. broad. 

 Palaemon Trompii appears to be also a rather small 

 species, the largest specimen (cf) being 7 cm. long, 

 the ova-bearing females scarcely 5 cm. The tolerably slender 

 rostrum extends usually to the end of the antennal 

 scales, occasionally it exceeds them very slightly; the 

 rostrum runs horizontally forward , only in one specimen 

 it is very slightly upturned distally and the upper margin 

 appears almost straight above the eyes, very rarely a 

 little convex. The upper margin bears 11, rarely 10 or 

 12 teeth , which stand until the apex ; the first tooth is placed 

 immediately before the middle of the cephalothorax and 

 usually the four proximal teeth are placed on 

 the carapace, the fifth before the orbital mar- 

 gin, occasionnally already the fourth stands 

 above the latter. The teeth on the carapace are nearly 

 equidistant, the interspace between the penultimate tooth 

 and the antepenultimate is mostly a little wider than the 

 interval between the penultimate and the last. In the male 

 specimen from the Mandai river the rostrum very slightly 

 exceeds the end of the antennal scales and the penultimate 

 tooth stands as far distant from the last as from the an- 

 tepenultimate. The lower margin is armed with 

 4 — 6 teeth. 



I observed under the microscope on the cephalothorax of 

 the adult male , anteriorly near the inferior margin , many 

 minute thorny points , but the greatest part of the cephalo- 

 thorax appeared smooth. The hepatic spine is scarcely half 

 as long as the antennal one and placed just behind and 

 somewhat below the latter. The apex of the telson fully 

 agrees with that of the preceding species. 



The external maxillipedes exceed the antennal peduncle 

 almost by the whole length of their terminal joint, in 

 the male as well as in the female. 



The first pair of legs of the adult male exceed the end of the 

 antennal scales by a third of their carpus, in the younger 



Notes from the Leyden IMuseuixi, Vol. XX. 



10 



