38 Addis on E. V err ill, 



ground-color is nearly white ; the head region and front of cara- 

 pace, two broad bands on the abdomen, and four wide bands on 

 the cheliferous legs are bright red ; the bases of the legs are bright 

 blue. Dana's colored figure shows the red bands, but no blue. 

 It is usually found swimming, with its appendages widely out- 

 spread, near the surface, and most often in pairs. 



It was first reported from Bermuda by Bate (Voy. Challenger). 

 His figure was from a Bermuda specimen. Two fine adult speci- 

 mens studied by me were taken by the Field Natural History 

 Museum party in 1905. They were found in tide-pools at 

 Cooper's Island. 



It is widely distributed in all tropical seas. Reported from the 

 Indian Ocean, Australia, Philippines, Fiji Islands, Cuba, Bahamas. 

 Porto Rico, etc. 



One of the singular larval stages is figured on Plate xii ; after 

 Herrick ; earlier stages are still more peculiar. 



Its bright coloration undoubtedly has a protective value when 

 living among bright red sponges and algae, so frequent on all 

 tropical reefs. 



Tribe PE1SUEIDEA Dana. Prawns. 

 Penaidea Dana, op. cit., 1852. 

 Dcndrobranchiata Bate, op. cit., 1888. 



Branchiae are branched, with slender filaments ; usually eight 

 pairs. Legs of the three anterior pairs are nearly always chelate 

 and slender; those of the third pair longest and always chelate; 

 first pair shortest; fourth and fifth pairs of legs are slender and 

 simple, the last sometimes abortive ; outer maxillipeds are long 

 and leg-like; second and third maxillipeds have an exopodite. 

 Sides of the carapace extend farther back than the dorsal margin. 

 Rostrum is usually long, dentate and carinate ; the carina usually 

 extends back more or less on the carapace. Fourth, fifth and 

 sixth abdominal segments are compressed and usually carinate; 

 sometimes also the second and third. Eyes usually large, on two- 

 jointed stalks. Mandibles have a two- jointed palpus. Antennae 

 long, with a broad foliaceous scale. 



Antennules are biflagellate ; basal segment of the stalk is exca- 

 vated and modified to accommodate the eyes ; there is a basal 

 antennular spine. Sternum usually has complex sexual organs. 



