LEANDER SEMMELINKIt. 137 



into three subfamilies Scyllaridae, Palinuridae and Araeo- 

 sternidae, the last being distinguished by the rectangular 

 narrow sternum and the structure of the elongated sub- 

 cylindrical hairy carapace , which is quite devoid of spines. 

 According to Dr. T. C. Winkler, the learned palaeon- 

 tologist of Haarlem , to whom I sent a figure and a short 

 description of our Araeosternus , there are no fossil Crus- 

 tacea, that resemble this interesting form. 



L e ander p acificus Stimpson. 



Four specimens collected on the shores of Amboina were 

 presented to us by Mr. Schorel. l^pper margin of the 

 rostrum in two specimens armed with seven , in the two 

 other ones with eight teeth. End of the rostrum provided 

 in three specimens with two small teeth close to each other, 

 immediately behind the apex , in the fourth individual only 

 with one small tooth. Inferior margin with four teeth , 

 in two specimens a fifth very small tooth before them , 

 at a small distance from the apex. This species may be 

 closely allied to Leander serenus Heller , but may be 

 recognized by the strongly serrate inner margin of the 

 short terminal filament of the internal antennae. 



Leander s e m m elinkii n. sp. 



A fine small species , of which the Museum contains 

 no fewer than 56 specimens, lately collected by Mr. Sem- 

 melink on the road of Makassar , Celebes , more or less 

 allied to Leander longicarpus Stimps. and Leander modestus 

 Heller. 



Rostrum very slender, longer than the carapace and 

 more or less far extending beyond the end of the anten- 

 nal scales, the basal half or the basal two thirds of the 

 upper margin straight and armed with 8 — i) very acute 



Notes; from the Leyden IMiiseum, "Vol. 111. 



