252 RANKIN. 



short. Distal end of meros reaches to extremity of third pair 

 maxiUipedes. Left chelapod lacking. 



Second pair of pereiopods slender, with very small chelae. 

 Carpus five-jointed ; proximal segment equal in length to 

 the four distal segments. Remaining three pairs of perieopods 

 similar to each other and equal in length to the second 

 pair. Pleopods narrow and biramous. Telson narrow and 

 compressed, with smooth margins. Uropods slightly longer 

 than telson. 



Total length of specimen i6 mm. 



The species above described agrees generically with Athaiias 

 Leach (Edin. Ency., VIII, p. 432), with the exception that the 

 eyes are entirely covered by the carapace. I propose, rather 

 than found a new genus on the single specimen, to amend Leach's 

 definition oi Atlianas by changing the statement, " Opthalmopoda 

 short, scarcely reaching beyond frontal margin of carapace " 

 (Bate, Challenger, Macrura, p. 528), to oplithabnopoda short, 

 covered by, or scarcely reacJdng beyond the frontal margin of 

 carapace. 



There are four hitherto described species of Athanas : 



A. nitiscens Leach. England and Norway, Mediterranean to 

 Cape Verde Islands. 



A. velocidus Bate (1. c, p. 529). Cape Verde Islands. 



A. mascareniciis Richters (Beitrage zur Meeresfauna von 

 Mauritius u. d. Seychellen, p. 164, 1880), Mauritius. 



A. diniorplms Ortmann, Crust, in Semon's Forschungsreise 

 (Jena. Denks., VIII, 1894, p. 12). East Africa : Dar-es-Salaam. 



From all these species A. ortniaimi may be distinguished at a 

 glance by the form of the large chela. 



Pen^eidea. 



Family Penaeidae Bate. 



63. Penaeus constrictus Stimpson. 



Stimpson, Ann. Lye. Nat. Hist. N. Y., p. 135, 1871. 

 Miers, Notes on the Penaeidae, Proc. Z06I. Soc, London, 

 p. 308, i8;8. 



