LARVAE OF DECAPOD CRUSTACEA 325 



Group II C 

 Telson of C I type ; leg 5 without exopod 



Callianassa? D. XIV (Fig. 25) 



Discovery St. 278. 



Rostrum 1-2 mm.; body 4-37 mm. 



Rostrum broad, not much longer than antennule, with narrow bare tip ; dorsal ridge 

 continuing on to carapace. Carapace closely 

 serrated in front. Abdomen: somite 2 with 

 very large dorsal spine reaching half way along 

 somite 4; somites 3-5 with coarsely serrated 

 dorsal ridge. Pleura all rounded. 



Telson less than twice as long as wide, 

 widening to end ; spines i and 2 very small and 

 near outer angle; posterior margin straight; 

 spine formula 8, 1,8. 



Eye nearly round. Antenna with small outer 

 setae at base of exopod : basis with small inner 

 spine. Palp of maxillule and maxilla of three 

 segments. Maxillipede i with outer seta on 

 segment i. 



Legs without epipods. Leg 5 without exopod. 

 Three pairs of pleopods. 



Fig. 25. Thalassinid D. XIV. 



a. Telson. h. Telson stage II. 



c. Antenna, stage II. 



Callianassa? D. XV (Fig. 26) 



Discovery St. 708. 



Rostrum 1-24 mm. ; body 3-90 mm. 



Rostrum very broad, scarcely longer than antennule. Carapace with close-set 

 marginal spines in front. Abdomen : somite 2 with dorsal spine reaching end of somite 

 4 ; somites 3-5 with coarsely serrated dorsal ridge. 



Telson less than twice as long as wide; lateral spines 1-4 close together at angle; 

 posterior margin concave, with minute median spine and four spines on either side; 

 spine formula 8, 1,8. 



Eye oval, rather pointed, pale. Antenna: basis without inner spine; scale with outer 

 basal seta. Palp of maxillule and maxilla of three segments. 



Chelae of legs i and 2 not fully formed, fairly large. Leg 5 without exopod. Epipods 

 absent. Three pairs of pleopods. 



Callianassa? D. XVI 



Discovery St. 1375. 



Rostrum 1-65 mm.; body 6-86 mm. 



Rostrum broad, parallel-sided, considerably longer than antennule. Carapace with 

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



with serrated ridge. 



5-2 



