268 



CKUSTACEA collected by W. A. HEKDMAN, E.K.S., 



in PUGET SOUND, PACIFIC COAST of 



NOBTH AMEKICA, September, 1897. 



By Alfred 0. Walker, F.L.S. 



With Plates XV. and XVI. 



[Read May 13th, 1898.] 



The collection of Malacostraca made by Prof. Herdman 

 in Puget Sound, on the occasion of his visit to Canada 

 with the British Association, in September, 1897, consists 

 of 33 species, as specified below. Of these the large 

 proportion of 7 appear to be new to science, and of the 

 others 4, viz., Leucothoe spinicarpa (Abild.), Melita dentata 

 (Kroyer), Ischyrocerus minittus, Lillje., and Podoceropsis 

 excavata (Sp. Bate) have not, to my knowledge, been 

 previously recorded from the Pacific, so that nearly one- 

 third of the total number of species are new to the fauna 

 of the west coast of North America. This large propor- 

 tion can only be attributed to the long experience of 

 Prof. Herdman in dredging operations, the trained eye 

 being able to detect small species, as well as to see the 

 difference between similar, but not identical, species in 

 the larger forms. 



The geographical distribution of the European species 

 of Amphipoda in the collection presents some interesting 

 points. Leucothoe spinicarpa has been found from Green- 



