36o DISCOVERY REPORTS 



endopod 2-55 mm.; exopod faintly segmented, with three groups of aesthetes; stylo- 

 cerite large. 



Flagellum of antenna as long as scale. 



Legs I and 2 not chelate. Pleopods large. 



This specimen is included in this series, ahhough the presence of a supra-orbital 

 spine shows that it must belong to a distinct species. 



Stage IX? (Figs. 16-19). 



One specimen in the last stage was taken in plankton and moulted the same night to 

 the post-larval stage. As the animal was not examined alive I have only the moulted 

 skin for description. 



Rostrum i mm. long, with four dorsal teeth. Carapace 1-9 mm. long, without 

 supra-orbital spines, but with dorsal, antennal and pterygostomial spines. A series of 

 lines are clearly marked (Fig. 16). These lines, which do not seem to bear any relation to 

 the carapace lines described by Boas and others, are repeated in almost exactly the same 

 arrangement in specimens from the Barrier Reef and Bermuda. In a specimen from 

 Bermuda, which was examined very soon after preservation, they were very clearly 

 picked out in red. In Caridion gordo7ii there are two transverse red lines, the one 

 immediately in front of the anterior tubercle, and the other running across from the 

 gastric groove. They correspond to the two transverse lines in Lysmata, but the posterior 

 longitudinal lines cannot be traced. It is possible that they may none the less exist and 

 be visible in the moulted skin. 



Abdominal somite 5 without dorsal spines; somite 63-6 times as long as deep. 

 Telson 1-3 x 0-45 mm. with one pair of lateral spines and 5+5 terminal spines, of 

 which the second is very large. Anal spine absent. 



Peduncle of antennule i -95 mm., with small stylocerite ; outer flagellum 4-9 mm. long, 

 segmented, with aesthetes on segments 2, 3, 4. Antennal scale 1-85 x 0-35 mm., 

 flagellum very long. 



Mouth-parts of the same form as in earlier stages. Exopod of maxilla very large, 

 somewhat truncated in front. 



Maxillipede i with exopod expanded at base and bearing here ten setae ; distal part 

 with six setae. Legs i and 2 subchelate. The following table gives measurements 

 (in mm.) of the legs. Leg 4 is lost. Propod of leg 5 expanded, the length about 4^ times 

 the width. 



Pleopods large, with rudimentary setae. 



