DXTBUN NATUBAL HISTORY SOCIKTY. 27 



FRIDAY EVENING, MARCH 13, 1857. 



Professor "W. H. Harvey, M.D., M.R.I.A., in the Chair. 



The Minutes of the previous meeting having been read and signed, — 



Mr. II. P. Williams exhibited a fine specimen of the Peregrine (Falco 

 peregrinus), killed in the county of Meath, and presented to the Society 

 by Henry Meredith, Esq., through George Annesley Pollock, Esq. 



Dr. J. R. KiNAHAN read a paper — 



ON A CRANGON NEW TO SCIENCE, WITH NOTICES OP o¥hER NONDESCRIPT 

 CRUSTACEA, AND OBSERVATIONS ON THE DISTRIBUTION OF THE CRUSTACEA 

 PODOPHTHALHIA op the EASTERN, OR DUBLIN MARINE, DISTRICT OF IRE- 

 LAND. 



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Before proceeding, according to my promise at our last meeting, to 

 describe this hitherto unnoficed Crangon, it will be necessary to review, 

 in a cursory way, the species of this genus already described. 



The genus Crangon is now generally restricted to those macrourous 

 Crustacea in which the first pair of legs are subcheliform, that is to say, 

 terminating in a movable hooked claw, articulated to the external 

 angle of the extremity of the terminal joint of the leg, and folding down 

 on a permanent fixed spine, arising from the internal angle of the same 

 joint ; the second pair of legs slender, minute, and didactyle, i. e. ter- 

 minating in a regular-formed hand, with a movable finger ; the remain- 

 ing pairs of legs acuminate and monodactyle ; the external maxillipeds 

 subpediform ; the internal antenna) inserted on a line above the ex- 

 ternal, and the eyes free. Thus excluding certain species, which aro 

 now grouped under the following genera : — Argis {Kroyer). [Eyes con- 

 cealed beneath the carapace ; fourth and fifth pair of legs dilated, nata- 

 torial: (C. Lar.) {Oicen).'] Sabinea ( Ouen). [Second pair of legs very 

 short, not cheliform : C. septein carinatus {Sabine).'] Paracrangon {Dana), 

 [Second pair of legs obsolete : Paracrangon echinatu* {Dana).'] 



