LEPTOSTEACA, SCHIZOPODA AND STOMATOPODA. 183 



a spine is represented on the carapace of two species of Lysioerichthii). For this 

 reason I venture to differ from Brooks, in regarding Claus' Erichthoidina brevispinosa 

 as a Lysioerichthus rather than as a Gonerichthus. 



Belonging to the genus Pseudosquilla (Guerin) Dana. 



Pseuderichthus communis, Hansen (1895). 



Locality : South end of the Red Sea, surface tow-net. One specimen, 15 millims. 



Herdman's example is smaller than either Claus', Hansen's or Jurich's larvse, 

 hut agrees well with all three in its chief points. At this stage, however, only three 

 spines are to be noted on the outer uropod. The tooth on the ventral edge of the 

 rostrum just in front of the eye is very prominent. 



Distribution : General throughout the tropical Atlantic and Indian Oceans 

 (Claus, Hansen and Jurich). 



Belonging to the genus Gonodactylus, Latreille. 



Gonerichthus a. Plate III., fig. 42. 



Locality : Cheval Paar, surface tow-net. One specimen, 1 1 millims. long from eye 

 to telson. 



Carapace (fig. 42) with rostrum fairly long, equal in length to the rest of the 

 carapace from the eye to posterior dorsal spine ; about eight small denticles on the 

 ventral edge of the rostrum ; antero-lateral spines short ; postero-lateral spines long, 

 extending to the junction of the third and fourth segments of the abdomen ; a small 

 postero-ventral spine at the base of the postero-laterals ; postero-median dorsal spine 

 very small. 



Abdomen with all the segments developed, and having their postero-lateral corners 

 acutely angulated ; sixth segment with a pair of small median dorsal spines on its 

 posterior border; appendages all well developed, biramous and setose; gills well 

 developed and already digitate. 



Telson about as long as broad, six marginal spines well developed and somewhat 

 acute ; margin between the submedian spines somewhat deeply emarginate and 

 distinctly notched, bearing thirty submedian denticles ; two intermediate and a single 

 lateral denticle present on each side. 



Uropods very well developed and almost as long as the telson; external margin 

 of tbe outer branch with only two distinct spines ; inner spine of the basal prolonga- 

 tion much longer than the outer, which is quite small. 



Raptorial claw without any signs of spines on the dactylus ; last three thoracic 

 appendages well developed and biramous. 



Length 11 millims. from the eye to the telson. 



