GONIOCHELE. 25 



and straight, formed by the projecting front ; basal joint of the internal antennae 

 pear-shaped, gibbous, and granulated. 



Length of carapace, - 7 inch nearly; breadth, 07 inch. 



Obs. The only specimen known of this beautiful species is in the collection of 

 Mr. Wetherell, and was found at Holloway. The carapace only remains, but this is 

 perfect excepting the extreme posterior margin. Of the important orbital and antennary 

 regions there exist only the orbits, the antennary fossae (imperfect), and the basal joint of 

 the internal antennae. The affinities of this form, as far as indicated by the character 

 of the carapace, is clearly to the family of Corystidae, and it is probably not far remote 

 from Atelecyclus; but it differs from that genus, and from all others of the family 

 in several particulars ; in the more circular and circumscribed orbit, indicating short 

 ocular peduncles, a narrower hiatus of the orbit, probably filled by the basal joint of 

 the external antennae ; transverse antennary fossae, with a distinct, short, solid, basal joint 

 of the antennules, and a horizontal, plain, and unarmed front. The latter part, in every 

 known species of Atelecyclus, the genus to which the present form appears, prima facie, 

 to be most nearly allied, is quin que- dentate, the three middle teeth being the most 

 prominent. The orbits too, are, in the recent form, much less entire, and the fissures 

 both above and below are large and deep. These characters indicate an approach to 

 some of the Canceridae, and especially remind us of some of the more circular forms 

 of Xantho, as, for example, X. integer of De Haan, to which, however, its relation is more 

 apparent than real. 



The above observations on the affinities of this fossil, must be taken as merely 

 provisional, and the discovery of more perfect specimens may require them to be 

 corrected. 



Order— ANOMUEA ? 

 Sub-Order— APTERURA ? 



Family— (?) 



Genus — Goniochele, Bell. 



Char. Gen. Testa hexagona, latior quam longior. Orbita lata?, apertae, supra 

 dentatae, margine inferiore integerrimo, semicirculari. Pedes antici validi, marm 

 compressa, obtrigona, digito mobili eontra marginem anteriorem oblique truncatum, 

 apposito; reliqui graciles; posteriores parvi, supra dorsum retroversi. Abdomen in utroque 

 sexu segmentis omnibus separatis ; biaris lineare, eqsmiNjE ovale. 



4 



