104 ZOOLOGISCHE MEDEDEELINGEN — DEEL V. 



1 young female from Sangkapoera-roads, Bawean-island, collected by 

 the Siboga Expedition at a depth of 12 m. Bottom mud. (Stat. 323). 

 1 young male collected July 1915 by Dr. P. Buitendijk at Pulu Weh. 



These specimens differ from the Japanese Penaeopsis intermedia (Kish.) 

 by the following. The rostrum is obliquely directed upward and armed 

 with 9 — 11 teeth in addition to the isolated epigastric tooth; the two 

 posterior of the 3 spinules with which the telson is armed at either side, 

 are shorter than in the typical species, the posterior spinule reaching 

 only to the middle of the distance between the insertion and the tip, 

 while the anterior is only half as long as the posterior one. 



In the largest specimen, a female from Ternate long 80 mm., the 

 rostrum reaches a little beyond the 2nd joint of the antennular peduncle, 

 in the male from the Kei-islands, long 77 mm., to the middle of this 

 joint, in the young female from Stat. 323 almost to the middle, but in 

 the very young specimen, long 16 mm., from Balikpapan it extends only 

 to the corneae of. the eyes. First, second and third abdominal terga roun- 

 ded, the fourth obtusely carinated, except the anterior 3 rd or a little more, 

 fifth and sixth sharply carinated. 



Petasma symmetrical, terminating distally at either side in an acumi- 

 nate spout, between which are placed two shorter rounded lobes. 



Penaeopsis ensis (de Haan) from Japan differs from both the typical 

 Pen. intermedia and the variety anchista by an obtuse crest which from 

 the hepatic spine runs backward to the posterior margin of the carapace 

 and furthermore by the stronger carination of the abdomen : the posterior 

 half of the 2nd tergum is crested, there is a distinct flattened keel on the 

 3^ while the 4th to 6th terga are sharply carinated. In Pen. ensis the 

 rostrum is slightly turned upward, the two posterior spinules of the telson 

 are rather long like in the typical intermedia, but, like in the variety 

 anchista, the anterior spinule is only half as long as the posterior. In 

 Pen. ensis, finally, the peraeopods of the 1st pair are also bispinose. 



(These characters of Pen. ensis were communicated to me by Dr. E. 

 Horst of the Leiden Natural History Museum, who kindly did examine 

 the only still existing type specimen of this species). 



Penaeopsis Borradailei de Man. 



Penaeopsis Borradailei J. Gr. de Man, Siboga Exp., Monogr. 39a, Part I, 

 Penaeidae, 1911, p. 73, PI. VIII, fig. 24— 24 b. 



1 male collected Dec. 16th 1919 by Mr. Laurense on the reef of one 

 of the Little Sunda Islands. 



