LARVAE OF DECAPOD CRUSTACEA 319 



Telson nearly four times as long as wide, with four rather widely spaced lateral 

 spines ; distal margin produced, with seven spines on either side of the median spine ; 

 spine formula 11, i, 11. 



Eye oval. Antenna without inner spine on basis ; scale with outer basal seta. Maxillule 

 with palp usually of two segments. Maxilla with palp of three segments. Maxillipede 

 T with outer seta on segment i. 



a. Maxilla. 



e. Telson. St. 708. 



Fig. 19. Thalassinid D. X. St. 690. 



b. Antenna. c. Maxillipede i. d. Rostrum. St. 708. 



/. Palp of maxillule. St. 1581. g. Endopod of maxillipede i. St. 1581. 



Chelae of leg i large. Leg 5 with very small setose exopod. Epipods absent. Four 

 pairs of pleopods. 



This form is as widely distributed and nearly as common as species D. I. Small 

 differences found suggest that more than one species may be included : 



(i) Specimens from the Indian Ocean, while agreeing in general characters with 

 those from Atlantic differ in small details. Those from Sts. 1574, 1578 and 1589 have 

 six spines on each side of the median telson spine, and are, on the whole, larger. 



