500 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 23, 



apparently destitute of a nuchal furrow ; it differs also in the form 

 of the anterior border of its carapace. 



Upper White Lias. Ilminster. Museum of Charles Moore, Esq., 

 F.G.S. 



7. Erton Oppeli, spec. nov. PI. XXIY. fig. 4. 



I beg leave to call attention to a curious specimen of Eryon (part 

 of the Haberlein collection, now lodged in the British Museum) 

 from the Lithographic Stone of Solenhofen. 



It is preserved upon the plane surface of a slab, and shows the 

 five pairs of limbs, the large and broad maxillipedes with their palpi 

 attached, one of the inner antennae with its two setae, and, lastly, 

 the fourth, fifth, sixth, and seventh abdominal segments with their 

 caudal plates attached. 



Out of the large number of specimens of Eryon which I have 

 been able to examine from Solenhofen, and among the numerous 

 examples figured, I cannot find a single instance in which, as in 

 this individual, the first pair of chelae are so small as compared with 

 the four succeeding pairs of legs, or in which the caudal plates, 

 including the central plate (the telson) are so remarkably round and 

 broad. 



In illustration of the complete manner in which the Solenhofen 

 Crustacea have been treated, I believe this to be the only inde- 

 terminable example out of a collection containing upwards of 400 

 specimens of this class. 



I propose to name it Eryon Oppeli, after the author of the 

 ' Palaontologischen Mittheilungen,' whose works will long remain 

 his best monument. 



Length of forearm 1 inch 4 lines, breadth 2 lines ; length of 

 chelae 2 lines, second pair 18 lines long, breadth 1| line ; length 

 of third pair 14 lines, breadth 1 J line ; length of fourth pair 13 

 lines, breadth IJ line ; all these are chelate, but the fifth pair are 

 monodactylous ; length of fifth pair 7|- lines, breadth 1 line. 



Maxillae 5 J lines in length by 3 lines in breadth, semiorbicular 

 in form exteriorly, interior margins straight and finely serrated ; 

 palpus 3 lines in length ; antennae 3 J lines in length ; abdomen 

 8J lines in breadth ; telson 7 lines long by 6| broad — with the 

 overlapping caudal plates, making 11 lines in breadth. 



Eeyois-, sp. ? 



I wish to record the fact that Mr. Moore has also obtained from 

 this same Upper Lias rock a fine Eryon, which measured at least 

 6 inches in length, its abdomen 2 inches in breadth, and the cara- 

 pace probably 2| inches ; much of the latter, however, has been 

 destroyed ; and therefore I do not feel warranted in giving it a 

 specific name, as it may perhaps prove to be Eryon antiquus when 

 we know more about it. 



Ebton", sp? 



Lower Chalk, Steyning. (Vide Morris's Catalogue, p. 108.) 



This is probably a portion of a Squilla, several fragments of which 



