476 Capt. A. F. McArdle— Some Results 



The species is nearest E. indica of Alcock and E. lata of 

 M. Rathbun (E. puhescens, Faxon) . It differs from the former 

 in having a flatter carapace with less swollen branchial 

 regions, a cardiac region not depressed, in being covered with 

 hair, in having longer eyestalks, and in having the external 

 orbital spines directed forwards instead of obliquely outwards. 

 From E. lata by its general hairy covering, by the longer 

 eyestalks which extend beyond the angle of the orbit, the 

 external orbital spine projecting beyond the rostral spines, 

 and the chelipeds being much longer in proportion to the 

 ambulatory legs. 



In the " Key to the Indian Species of Ethusa" as pub- 

 lished by Major Alcock in the J. A. S. B. vol. lxv. part ii. 

 no. 2 (1896), the species will be placed with E. andamanica in 

 part 2 of the first division, being divided from it by the dis- 

 tinction that the external orbital spines are long, acute, and 

 project beyond the level of the frontal spines, and the body 

 being hairy. 



The species will be figured in the " Illustrations to the 

 Zoology of the R.I.M.S. ' Investigator.' " 



MACRURA. 



Fam. Thalassinidae. 



Calocaris, Berl. 



Calocaris Alcocki, sp. n. 



Description of an adult female. — Carapace laterally com- 

 pressed and smooth. Rostrum long, narrow, and curved 

 upwards, deeply grooved on its upper surface, the margins 

 of the groove being produced backwards as well-defined ridges 

 over the anterior part of the carapace, and giving rise on 

 either side to a small spine directed upwards and forwards. 

 The rostrum itself has two small spinules on its left margin, 

 one on its right. All the regions of the carapace are smooth 

 and devoid of hair. A slight median carina runs the whole 

 length of the carapace. The abdomen is longer than the 

 carapace, smooth, non-carinated. 



Eyestalks short, eyes rudimentary ; no traces of pigment 

 or cornea. 



The second antennas have their first or basal joint unarmed, 

 the second joint has two fixed spines. A short internal spine 

 and an external, which is longer, but which does not reach 

 the next joint. From the second joint there also arises an 

 articulatory spine or scaphocerite, which projects but for a 



