140 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 23. 



upper, has the peduncle as long as the upper antenna. The coxae 

 of the legs are small and unimportant. Unfortunately the gnatho- 

 poda and anterior pereiopoda are missing ; the three posterior are 

 equal. The three anterior segments of the pleon are large ; each 

 being equal to the three or four of the pereion. The posterior pair of 

 pleopoda terminate in two lanceolate rami. The telson is simple, 

 squamiform, and lanceolate. In this particular species the third 

 segment of the pleon is ornate — ^that is, fringed or ornamented 

 along the posterior margin by a series of teeth, — and the posterior 

 pleopoda have the rami equal. 



It appears therefore that, with the exception of the carina on the 

 dorsal line of the fossil specimen, and the ornate margin of the third 

 segment of the pleon, the description might serve for both specimens, 

 as far as known ; and it is upon this close correspondence of the 

 two, that I have constructed the figures in the accompanying plate 

 (Plate YI. figs. 1 and 2) of Amphijooda, from the fossil specimens 

 found by Mr. Kirkby, without the slightest straining of anatomical 

 details. It is upon this approximation of the recent to the fossil, 

 that I am induced to beheve that the specimens are parts of an 

 Amphipod, which, if correct, is, I believe, the first Crustacean of 

 that Order yet recorded. 



EXPLANATION OF PLATE VI. 



Fig, 1. Proso^poniscus problematicus, restored. 



Fig. 2. rolled up. 



Fig. 3. Four posterior segments of the pereion, and two anterior segments of the 

 pleon, fossil. 3' ligature between the segments, seen on the stretch. 

 3" Posterior margin of the second segment of the pleon in the fossil. 

 3'" Posterior margin of the third segment of the pleon in the recent 

 amphipod {Ampelisca BelUana). 



Fig. 4. Two posterior segments of the pereion, and two anterior of the pleon. 



Fig. 5. Cephalon and two anterior segments of the pereion ; d part of mandible? 



Fig. 6. Cephalon and four anterior segments of the pereion ; d part of man- 

 dible? 



Fig. 7. Cephalon ; viewed anteriorly, partly imbedded in the matrix. 



Fig. 8. PhcBdra antiqua (the unshaded parts are restorations) ; z. Telson, 



8. On some New Species of Eueypteeus ; with Notes on the Distribu- 

 tion of the Species. By J. W. Saltee, Esq., F.G.S., of the Geolo- 

 gical Survey of Great Britain. 



[Deferred.] 



9. Description of a New Fossil Crustacean from the Lowee Geeen- 

 SAm) of Atheefield. By Chaeles Gould, Esq. (Communicated 

 by Professor Huxley, F.G.S.) 



[Deferred.] 



