LARVAE OF DECAPOD CRUSTACEA 



329 



Telson wide, triangular, with 15, i, 15 spines, spine 2 reduced to a hair. 



Antenna : basis with very small inner and outer spines ; scale broad with small apical 

 spine and no basal outer seta. Mandible rudimentary, with palp. Maxillule rudi- 

 mentary, without setae. Maxilla with well developed exopod, but laciniae and palp 

 without setae. Maxillipede i with large bilobed epipod; endopod unsegmented, very 

 small ; coxa and basis without setae. Maxillipedes 2 and 3 with endopods unsegmented, 

 without setae. 



Legs 1-5 with exopods. Legs i and 2 with large chelae. Epipods absent from 

 maxillipedes 2 and 3 and legs. Four pairs of pleopods, 4 and 5 with rudiment of 

 appendix interna. Uropods traceable under skin. 



a. Part of telson. 



Fig. 30. Thalassinid B.R. IX. 



b. Antenna. c. Mandible and maxillule. 



d. Maxilla. e. Maxillipede i. 



Callianassa? B.R. X 



Barrier Reef St. 49. 



Total length 6-8 mm. 



Rostrum rather narrow, scarcely longer than antennule. Carapace with a few small 

 marginal teeth. Abdomen : somites 2-5 with small dorsal spines, slightly ridged. 



Telson broad, triangular, with 19, i, 19 spines. 



Eye round, black. Antenna : basis with small outer and minute inner spines ; scale 

 without outer basal seta. Mouth parts rudimentary. 



Legs I and 2 with rather small chelae. Leg 4 with small exopod; leg 5 without 

 exopod. Epipods absent. Three pairs of large pleopods. 



Callianassa? B.R. XI (Fig. 31) 

 Barrier Reef St. 49. 

 Total length 57 mm. 



Abdomen : somites 4-6 with small dorsal spines, not ridged. 

 Telson broad, triangular, with 14, i, 14 spines. 



