146 



The abominal appendages exhibit nothing unusual. The caudal swimmerefc 

 is somewhat of the Astacidean type, the blades being sub-equal, and being very- 

 similar in size and shape to the telson : the outer edge of the exopodite is 

 strongly and sharply serrated. 



A single female, about 31 millim. long from tip of rostrum to tip of telson, 

 from the Bay of Bengal, off Trincomallee, 200-350 fms. 



The colours in life were : body salmon-red, flecked slightly with white ; 

 third pair of trunk legs with white nodes and salmon-pink internodes. 



Regd. No. ~ (Type of the species). 



Richardina, A. M. Edw. 



Richardina, A. Milne Edwards, Rapport Coram, fauue sous-marine, p. 41 (Paris, 1882), and Recueil de Fig. de 

 Crust, nouv. plate 8 (Paris, 1883). 



Body smooth except for some rows of spines in the anterior part of the 

 carapace, not compressed. Rostrum of moderate length, laterally compressed. 

 Telson blunt-pointed, dorsally spinose, about as long as the caudal swimmerets, 

 the outer of which has no transverse fissure. 



Eyestalks present, short, eyes obsolete. Antennular peduncle short and 

 slender : two antennular flagella of unequal length. Antennal scale elongate, 

 broadly falcate. 



Mandible with incurved 3-jointed palp. All three pairs of maxillipeds with 

 well formed flagelliform exopodites, those of the 3rd pair comparatively shorter 

 than the others. 



The first three pairs of legs are chelate, and increase in length in posterior 

 succession, the 3rd pair are the strongest. The 4th and 5th pairs end either in a 

 simple or bifid dactylus and have the carpus and propodite compounded each of 

 several segments. 



Eggs very large. 



The branchial formula is exactly the same as that of Engysteiiopus, consist- 

 ing of 18 branchiae and 7 epipodites on either side, arranged in the same way. 



Richardina differs from Stenopus chiefly in having the eyes aborted: the 

 body is stouter and more compact and the spines of the carapace are confined to 

 its anterior portion. 



87. Richardina SpongiCOla, Alcock and Anderson. 



Richardina spongicola, Alcock and Anderson, Ann. Mag. Xat. Hist., April 1899, p. 291. 

 Illustrations of the Zooloi;y of the Investigator, Crustacea, Plate XLII. Fig. 4. 



The carapace, which is of thinner texture than the other parts, is short, 

 broad, and tumid ; the prominent posterior edge of the cervical groove is armed 



