404 Surg.-Capt. A. Alcock on 



Family Leucosidse. 

 Eandallia, Stimpson. 



91. Randallia lamellidentata, Wood-Mason. 



Randalliu lamellulentata, Wood-^Iason, Illustrations of the Zoology of 

 II.M. I.M.S. ' Investigator,' Crustacea, jjart i. pi. v. fig. 5. 



Carapace subcircular, inflated ; the surface granular, beaded, 

 and in the middle line and on the branchial regions pustular, 

 the margins lamellar and irregularly lobulated. 



The front is bilobed ; the antero-lateral margin, like the 

 anterior part of the postero-latcral, is extended horizontally 

 to form a sharp lamella, which is cut up into several unequal 

 lobes larger than the two lobes of the posterior margin. The 

 hepatic, branchial, and intestinal regions are all very clearly 

 delimited, leaving only the boundary between the gastric and 

 cardiac regions undefined ; in the centre of the tumid intestinal 

 region is a blunt spine. The sternum is finely beaded. 



The abdomen is finely granular, and although the segments 

 from the third to the sixth are coalesceut, they are all 

 distinctly defined. 



The eyes and orbits are very small, the latter having two 

 fissures above and one below, and a pronounced hiatus inter- 

 nally. The antennulary fossie are large ; the antonnary 

 fiagella are minute. 



The external maxillipeds are large, with the exposed 

 surface closely and finely beaded ; the exopod, which is 

 rather broader than the endopod, has the outer margin nearly 

 straight and does not quite reach to the pointed extremity of 

 the meropodite. 



The thoracic legs are all granular or finely beaded. The 

 chelipeds, though stout, are not remarkably prolonged, their 

 length not greatly exceeding the breadth of the carapace j 

 the bead-like granules on the upper edge of the meropodite 

 are large ; there is a small tooth on the outer side of the 

 carpus at its distal end ; the palm and the dactylopodite have 

 the outer edge broadly and sharply crested, the immobile 

 finger also being slightly carinated. 



The remaining thoracic legs are short and slender. 



Colour white, with a pinkish blush. 



A male from Station 115, 188-220 fathoms. 



Length of carapace about 12 millim., its breadth being 

 about 13 millim. 



