GONIOCHELE. 25 



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

 pear-shaped, gibbous, and granulated. 



Length of carapace, 07 inch nearly; breadth, 7 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 antennas. The affinities of this form, as far as indicated by the character 

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

 from Atelecyclns; 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 antenuse ; transverse antennary fossse, with a distinct, short, solid, basal joint 

 of the antennules, and a horizontal, plain, and vmarmed 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 quinque-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 CanceridjB, 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 requke them to be 

 corrected. 



Ord^r—JNOMUHJ ? 

 Sub-Order— APTERURA ? 



Family— (?) 



Genus — Goniochele, Bell. 



Char. Gen. Testa hexagona, latior quam longior. Orhilce latse, apcrtae, supra 

 dentataj, margine inferiore intcgcrrimo, semicirculari. Fedes aiitici validi, manu 

 comprcssa, obtrigona, digito mobili contra marginem anteriorem oblique truncatura, 

 apposito ; reliqui graciles ; postcriores parvi, supra dorsum retroversi. Abdomen in utrocpic 

 sexu segmentis omnibus separatis ; maris lineare, rosMiNiE ovale. 



4 



