LARVAE OF DECAPOD CRUSTACEA 335 



There is no elongated " neck " as in Jaxea, but the upper Hp is further back from the 

 antenna than is usual. 



Mandibles asymmetrical, the left one transformed into a long curved spine ; the left 

 lobe of the paragnath produced into a similar, but longer and more slender, spine. 

 Maxillule with unsegmented palp and widely separated laciniae. Maxilla with endopod 

 reduced to a minute papilla; proximal inner lobe apparently absent; exopod small, 

 without proximal extension. Between maxilla and maxillipede i there is a ventral 

 swelling which is no doubt the glandular organ seen by Claus in Jaxea and by Thompson 

 in Naushofiia. 



Maxillipedes i and 2 with endopod of four segments, without outer setae on seg- 

 ments 1-3 ; inner setae small and slender, without coarse feathering; exopods with four 

 setae. Maxillipede 3 a simple rudiment with minute papilla representing exopod. 



a. Side view. 



Fig. 36. Naushonia ? B.R. I. Samoa. Stage I. 

 b. Telson. c. Mandible etc. 



d. Maxilla. 



Barrier Reef St. 44. 



Stage IV? Length 4-55 mm. 



Rostrum small, curving downwards between the eyes. Head elongated, the space 

 between antennae and upper lip nearly one-third the length of rest of carapace. 

 Abdomen as in stage I. Telson parallel-sided, a little less than twice as long as wide, 

 with three very minute lateral spines, a large spinous process at each angle, and ten 

 plumose setae on posterior margin. There is no median spine. 



Antennal scale without apical spine ; endopod longer than scale. 



Mandible on left side sickle-shaped, on right with ventral pointed process and 

 minute rudiment of palp. Maxillule as stage I. Maxilla with four inner lobes, with 

 few setae ; exopod with narrow bare proximal part. 



Maxillipede 3 and legs 1-3 with setose exopods ; endopods rudimentary, seated low 

 down on basis. Legs i and 2 not chelate. Maxillipede i with epipod and rudiment of 



