PENEUS SEMISULCATUS. l85 



two small triangular teeth on the anterior margin of the 

 carapace are acuminate in Fag. varipes , but directed out- 

 ward and more rounded in Pcig. deformis. The terminal 

 joint of the left third pair of legs is provided with an 

 elevated crest on its outer surface, which does not occur 

 in Pag. deformis. As regards the comparative length of the 

 peduncle of the external antennae , the two species almost 

 agree with each other: for also in deformis M. Edw. 

 that peduncle is positively as long as, but not shorter 

 than the eyes and in varipes it is indeed a little longer , 

 but not so much as has been figured by Heller. The 

 length of the cephalothorax of our specimen is almost 

 2 centim. 



23. Coenohiia rugosa M. Edw. 

 Numerous specimens were collected; they inhabit shells 



of the following genera : Terehra , Harpa , Natica , Fusus , 

 Triton , Nerita , Cassis , Murex , Turbo , Purpura , and 

 Succinum. 



24. Palinurus penicillatus Oliv. 

 A fine large specimen is in the collection . 



The tubercles of the carapace are non-piliferous , but 

 for the rest it agrees entirely with specimens from the 

 Indian Archipelago , as regards the spines of the interantennal 

 plate etc. But also another specimen in the Museum 

 collection from Padang has the tubercles of the carapace 

 nearly naked , so that I also think as Mr. Miers (I. c pag. 

 410) Pal. Ehrenbergii Heller to be identical with p^,/, 

 penicillatus Oliv. 



25. Peneus canaliculatus Oliv. 



A single specimen was collected in tlie Djeddali seas. 

 26. Peneus semisulcatus de Haan. 



Two young specimens were collected, which wholly agree 

 with the Japanese types. 



Ley den, Mai 1880. 



Notes frona the Ijeyden ]Museuiu , Vol. II. 



