LARVAE OF DECAPOD CRUSTACEA 307 



Leg I with chelae equal; dactyl about four-fifths length of palm; palm nearly twice 

 as long as wide. Leg 5 with exopod nearly as long as merus. Epipods and two arthro- 

 branchs on legs 1-4. Four pairs of pleopods on somites 2-5. 



This form is very common in the Discovery material and, as will be seen from the 

 table of distribution, it is found in the Atlantic as far north as 14° 39' N and also up 

 the east coast of Africa to 6° 05' N. In spite of this wide range I am unable to find any 

 definite specific differences. If it were not for the fact that leg 2 is chelate this form 



Fig. 6. Thalassinid D. I. 



a. Side view. St. 689. b. Maxilla. St. 688. 



d. Part of telson. St. 688. e. Part of leg 4. St. 688. 



/. Head and rostrum. Atlantis St. 1121. g. Antenna. St. 1121. 



c. Palp of maxillule. St. 688. 



h. Maxillipede i. St. 1 121. 



might well be claimed as the larva of Enoplometopiis, especially as it was taken in the 

 same collections. It differs from all the other forms described in having more numerous 

 species on the telson and in the slender unsegmented palp of the maxillule. 



Thalassinid D. II (Fig. 7) 



Discovery St. 1375. 



Rostrum 4-45 mm. ; body 12-45 ™"^- 



Rostrum very long and narrow, with short unserrated point. Carapace with a few 

 marginal spines. Abdomen : somite 2 with very large hollowed dorsal spine ; somites 3-5 

 with small hollowed spines. Pleura of somite 2 with ventral point, the rest rounded. 



