180 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Amphipoda Gammarida and Caprellida occur according 

 to Sars and in the L.M.B.C. District : — 



Number of Sars' species under 20 fath. (A) 106. 



do. 20— 50 „ (B) 102. 



do. 50—100 „ (C) 74. 



do. over 100 „ (D) 57. 



Number of Sars' species in L.M.B.C. Dist. (A) 76 



,, species not in Sars in do. 14 



— 90. 

 ,, Sars' species, &c. ... (B) 21 



,, species not in Sars ... 2 



— 23. 

 ,, Sars' species, &c. ... (C) 9 



,, species not in Sars ... 



— 9. 

 ,, Sars' species, &c. ... (D) — 1*. 



It will be seen from the above, at least as regards the 

 Amphipoda, 



1. That the proportion of species to genera increases 



with the area, and 



2. That a far greater number of species are found at 



depths less than 100 fath. than at that or a greater 

 depth, 208 species being recorded below 50 fath. 

 against 74 between 50 and 100 fath. and 57 above 

 100 fath. 



* Podocerus odontonyx {—P. herdmani), a doubtful species taken in 21 

 fath. and 38 fath. off Port Erin. 



