THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE II. VOL. VIII. 



No. XII— DECEMBER, 1881. 



ozEaia-iisTJ^Xi j^ie,Tio3LEs. 



I. — Contributions to the Study of Fossil Crustacea. 



By Henry Woodtvard, LL.D., F.E.S., F.G.S. 



(PLATE XIV.) 



HAVING- received an invitation from Mr. W. Stoddart to examine 

 the collection of his late father, Mr. W. W. Stoddart, F.G.S., at 

 Sneyd Park, Clifton, Bristol, I availed myself of the opportunity to do 

 so in April last, and was interested in finding, among many other good 

 British fossils, a new and undescribed Crustacean belonging to the 

 genus Eryon, from the Stonesfield Slate of Stonesfield, Oxfordshire. 



Unfortunately only the intaglio is preserved, the relievo side 

 having probably escaped detection or been broken up. This is, 

 however, sufficiently clear to enable one readily to compare it with 

 the other known forms of this well-marked genus. 



Ten species of Eryon have been described from the Lithographic 

 Stone of Solenhofen, which may be considered as probably near the 

 horizon of our Kimmeridge Clay. They are : — 



Eryon propitiqmts, ScMot. 

 ,, spinimarms, Germ. 

 ,, orbiculatus, Miinst. 

 ,, elongatus, Miinst. 

 ,, arctiformis, Schlot. 



Eryon bilohatus, Miinst. 

 ,, longipes, Fraas. 

 ,, Schuberti, Meyer. 

 ,, Bedenbacheri, Miinst. 

 ,, Oppeli, H. Woodw. 



To these must be added one species from the Oxford Clay of the 

 Haute-Saone, France, viz : — 



Eryon Perroni, Etallon. 



Next in descending order will come Mr. Stoddart's Eryon from the 

 Stonesfield Slate. 



1. — Eryon Stoddarti, H. Woodw., sp. nov. Plate XIV. Fig. 2. 



Description. — Carapace one-third broader than long, cervical groove 

 moderately deep and well defined ; dorsal ridge strongly marked and 

 extending from the posterior border to the cervical groove ; two 

 equidistant branchio- cardiac ridges extend from the same groove to 

 the posterior border on either side, terminating just where the margin 

 of the first abdominal segment joins the carapace ; the cervical groove 

 is marked by a deep notch on the border of the carapace, and the 

 posterior edge of the notch is shai-ply toothed ; the branchial border 

 is evenly rounded, and bears several small denticles upon it ; the 

 hepatic region has two strongly-marked rounded notches, and the 

 border is also finely dentated ; the anterior border is not clearly 

 defined. Greatest breadth of carapace, 5 centimetres; length, 3^ 



DECADE II. — VOL. VIII. — NO. XII. 34 



