146 



The abominal appendages exhibit nothing unusual. The caudal swimmer-eft 

 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 Avere : 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. 



Riehardina, A. Milne Edwards, Rapport Comm. faune sous-marine, p. 41 (Paris, 1882), and Recueil do Pig. 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. Antenna! 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 ch elate, 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 Engystenopm, consist- 

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



Bicluirdlna 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. Riehardina spongicola, Alcock and Anderson. 



Bicliardinit sponyinla, Alcock and Anderson, Ann. Mag. Nat. Hist., April 1899, p. 291. 

 ILLUSTRATIONS OF THE ZOOLOGY 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 



