LARVAE OF DECAPOD CRUSTACEA 323 



Eye oval. Antenna: basis with small inner spine; scale with outer basal seta. Palp of 

 maxillule and maxilla of three segments. Maxillipede i with outer seta on segment i ; 

 epipod bilobed. 



Chelae of legs i and 2 large. Leg 5 with minute exopod. Epipods absent. Four 



pairs of pleopods. 



Thalassinid B.R. V (Fig. 23) 

 Barrier Reef St. 54. 



Rostrum 1-35 mm.; body 4-93 mm. 



Rostrum broad, not much longer than antennule. Carapace with close-set marginal 

 spines in front and a dorsal ridge armed with spinules. Abdomen: somite 2 with very 

 large hollowed spine ; somites 3-5 with smooth ridge and small spines. Pleura rounded. 



Fig. 23. Thalassinid B.R. V. 

 a. Thorax, dorsal. b. Telson. 



c. Antenna. 



Telson about twice as long as wide, slightly widening distally; posterior margin 

 straight. Spines i and 2 widely separated, spine 4 very long; median spine shorter than 

 spine 4, with seven spines on either side alternately long and short ; spine formula 1 1 , i , 1 1 • 



Eye oval. Antenna : basis with very long outer and very small inner spine ; scale with 

 a minute hair near base. Palp of maxillule and maxilla of three segments. Maxilli- 

 pede I with outer seta on segment i, epipod small, not bilobed. 



Chelae of legs i and 2 large. Leg 5 without exopod. Epipods absent. Four pairs 



of pleopods. 



Group II B 



Telson of "A" type; three pairs of pleopods 



Thalassinid D. XIII 



Discovery St. 705. 



Rostrum 2 mm. ; body 6-85 mm. 



Rostrum broad, little longer than antennule. Carapace with few large marginal 

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

 Pleura all rounded. 



