NO. 6 DECAPOD AND OTHER CRUSTACEA SCHMITT 15 



from Barbados, off Jamaica, and Puerto Rico, had 8, 9, or 10 fused 

 segments and from 10 to 13 free segments. 



I do not find any characters that would indicate that the small 

 specimens are other than B. biunguiculatus, although several of them 

 are ovigerous. I have seen no small specimens with the segment count 

 of the fully developed large ones, and therefore believe that this 

 species varies considerably in the segmentation of the fused and 

 thicker free portion of its outer antennular flagellum. 



The rostrum of our Clipperton Island specimen has -Z_ teeth, of 



3 

 which the first two dorsal teeth are on the carapace, the next two are 



above the ocular peduncle, the last three are anterior to the eye ; the 



anteriormost is very close to the tip of the rostrum ; the ventral teeth 



are about as strong as the dorsal ; the proximal tooth is placed just 



proximal to the anterior margin of the cornea, not beyond or anterior 



to it. The rostrum is slightly longer than the antennular peduncle and 



slightly shorter than the antennal scale. 



The outer anterior angle of the basal joint of the antennular peduncle 

 is armed with a well-developed spine, the tip of which exceeds the 

 second joint of the peduncle. The spine of the antennal scale reaches 

 to the end of the sixth article for the fused part of the outer anten- 

 nular flagellum, the anterior margin of the blade to the end of the 

 fifth article. The free portion of the shorter ramus of the outer 

 antennular flagellum is a little longer than the fused portion ; each 

 appears to be composed of about seven articles. 



On the anterior margin of the carapace the antennal spine projects 

 well in front of the suborbital projection or angle ; the hepatic spine 

 is placed not much below the level of the antennal spine and is less 

 than the length of that spine behind the anterior margin of the cara- 

 pace ; the hepatic spine is also less than half the size of the antennal 

 spine. 



The right second chela is very slightly larger than the left ; it ex- 

 ceeds the antennal scale by the entire propodus. The fingers of either 

 chela of this pair are slightly shorter than the corresponding palm or 

 nierus ; the carpal joints are a little more than half the length of the 

 corresponding palms. 



Callianassa hartmeyeri Schmitt ij 1 ij 



Our specimens agree with those figured and described by Unit 

 (Arkiv Zool., vol. 30A, No. 5, p. 7, figs. 1-4, pi. 1, 1938). On the 

 chelae of these specimens there were bright ochraceous to orange 

 ochraceous (Ridgway) irregular color markings; both fingers toward 



