Family NEPHROPSIDAE. 



38. Enoplometopus longirostris de Man. PI. IV, fig. 20 — 20 b. 



Enoplometopus longirostris J. G. de Man, in: Archiv f. Naturg. 53. Jahrg. 1888, p. 488, 

 PI. XXI, fig. 4. 



Stat. 37. March 30/31. Sailus Ketjil, Paternoster-islands. Surface, in the plankton. 1 specimen. 

 Stat. 248. December 4/5. Anchorage off Rumah Lusi, North-point of Tiur-island. "pelagisch". 

 1 specimen. 



Besides these two still a third specimen is lying before me, one of the six from Amboina 

 described (1. c.) in 1888 and which is preserved in my private collection. The three specimens are 

 nearly of the same size, about 23 mm. long. In the specimen from Stat. 37 the lateral mar- 

 gins of the rostrum are armed at each side with 3 spines. The lateral row consists, according 

 to the original description, of 3 posterior spines placed on the gastric region and 2 anterior ones 

 on the rostrum; in the specimen from Stat. 37 one observes on the left side 3, on the right 

 2 spines on the rostrum, the 3' d supernumerary spine on the left side being smaller than the 

 preceding, placed in front of them, just behind the posterior one of the 3 marginal spines. 

 The five median spines on the carapace are low, not prominent and of equal size, the posterior 

 one placed on the cervical groove. Lower margin of the rostrum with 7 teeth, decreasing in 

 size from the posterior one to the anterior one. Outer orbital angle acute, though not spini- 

 form. Just above this angle a rather deep groove proceeds almost from the orbital margin 

 backward for a short distance, curves at first downward and runs then forward to nearly 

 midway between the curve and the antennal spine; cervical groove inconspicuous, but on the 

 branchial region two long parallel and oblique grooves exist, of which the anterior almost 

 unites with the first described gToove there where it curves downward. 



Pïeura of the 2 nd abdominal somite with two small teeth on the anterior border, which 

 posteriorly terminates in a strong tooth ; according to the original description there were three 

 small teeth on the anterior margin. The small tooth on the lateral margins of the télson, just in 

 front of the posterior spine, is still inconspicuous. In the specimen from Stat. 248 the lateral 

 margins of the rostrum bear only two spines at either side, but for the rest one observes the 

 typical number; the left pleuron of the 2 nd abdominal somite bears only one small tooth on 

 the middle of the anterior border, while this border has no teeth at all on the right pleuron, 

 in both, however, the posterior spine is well-developed. In this species the telson is broadly 

 grooved above to near the base and a little behind the level of the anterior pair of marginal 

 spines, at either side of the middle line and close to it, 2 or 3 long setae are implanted that 

 reach to the posterior extremity of the telson. 



