LEPTOSTRACA, SCHIZOPODA AND 8TOMATOPODA. 1(53 



Distribution : Australian seas and East Pacific near the Phillipine Islands 

 (' Challenger ') ; South Africa (STEBBING). 



Its occurrence at Ceylon thus fills up a gap in the distribution of the species in the 

 Pacific. Eound Ceylon it would appear to be a very abundant species, judging from 

 the contents of the stomach of a ray, Dicerobatis ergoodoo, which contained several 

 hundred specimens. All the other specimens were taken at the surface of the sea, 

 though its occurrence in the stomach of a bottom-living fish like a ray would seem 

 to indicate that the species does not always adopt an entirely pelagic habitat. 

 The depth over which the species was captured by tow-nets in no case exceeded 

 20 fathoms. 



Nematoscelis microps, G. 0. SARS (1885). 



N. rostrata, G. O. SARS (1885). N. mantis, CHUN (1896). N. microps, HANSEN (1905). 



Locality : Off Mutwal Island, Ceylon, March 19, 1902, surface tow-net. Two, 

 3 '5 millims. 



HANSEN (1905) has recently demonstrated that Nematoscelis rostrata is in reality 

 only the young of N. microps, and I here adopt his view of the matter. 



The two small Ceylon specimens agree very well with the description and figures 

 given by SABS of the Cyrtopia larva of N. rostrata. The rostrum is large and well 

 developed, and the lateral spine on the carapace very prominent. Though the 

 specimens measure only 3 '5 millims. in length, the long leg is already well developed 

 and measures about 2 millims. in length. It is too stoutly built to admit of referring 

 the specimens to N~. tenella. In other points, such as the general proportions of the 

 body, the Ceylon specimens are in harmony with SARS' figures. 



N. microps was taken by the " Challenger " at several stations in the tropical and 

 subtropical Atlantic Ocean and in the Pacific to the north of New Guinea. It has 

 since been recorded from the Mediterranean by CHUN, and from the tropical Atlantic 

 Ocean off America and Africa by ORTMANN and HANSEN respectively. 



FAMILY: MYSID.E. 



Siriella paulsoni, KOSSMANN. Plate I., figs. 3 to 7. 



S. jaltensis, PAULSON (1875), nee, CZERNIAVSKY. Siriellides paulsoni, CZERNIAVSKY (1880). 



Locality : Pearl Banks, Cheval Paar, March, 1902, 8 fathoms. One female, 

 12 millims. 



The general form of the body is robust and rather stoutly built. 



The carapace is shorter than the pleon and of equal breadth throughout. It is 

 produced in front into a short acutely pointed rostrum. 



The pleon has the first segment slightly longer than the next four, which are sub- 

 equal in length. The sixth segment is about one and a half times as long as the 

 fifth. 



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