THE ANNALS AND MAGAZINE OF NATURAL HISTORY. [SIXTH SERIES.] No. 93. SEPTEMBER 1895. XXX. — Notes on Amphipoda, old and ne.io. By the Rev. TiiOMAS R. R. Stebbing, M.A. [Plates VIII.-X.] The family Photidte was divided in Boeck's system into three subfamilies— Photina3, Leptoclieirin^, and Microdeutopinte. Though the name Microdeutopus alludes to the peculiarity of the animal's second gnathopods being-smaller than the first, the Microdeutopinge included species in which the first gnatho-pods are smaller than the second. For this and other reasons explained in the ' Challenger ' Amphipoda, p. 1062, and Sars's ' Crustacea of Norway,' p. 538, it has seemed desirable to relinquish Boeck's subdivision of the family. Delia Valle, in his ' Gammarini,' p. 351, carries the process of amalgamation further, and unites the Photidre and the Podoceridaj in one rather unwieldy family with the Corophiidfe. It is quite true that the three families are intimately related, but it is certainly a matter of convenience to keep them separate, and for this purpose the dorso-ventrally depi-essed body in the CoropJiiidie and the hooked uropods in the Podoceridte are useful cha-racters, neither of them being present in the Photida3. To borrow the words which Professor T, Thorell uses on a simihxr occasion — " The groups are on the whole and in their ti/pical forms sufficiently different to deserve their separate denomina-tions and the rank in the system which it has iiitlierto been customary to give them." Ann. t£' Mag. N. Hist. Ser. 6. Vol. xvi. 15
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