44 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 16, 



feet, or the peaks of tlie Andes to the south reaching to 11,000 feet, 

 the Isthmus nowhere attains 1000, that is, one-half the height 

 through which these beds of San Domingo have been elevated since 

 their deposition. 



It is to be hoped that Mr. Heniker, to whom we are indebted for 

 this interesting collection, will continue his researches, and clear up 

 the doubt which I have ventured to suggest, whether these fossils 

 belong to the same or to two formations of different geological age. 



Descriptions of new Species of Fossil Shells found bi/ J.S. Heniker, 

 Esq. By Mr. George B. Sowerby. 



Con us Haytensis. 



Testa oblongo-turbinata, conica, laevis, crassiuscula, spira subproducta, spiraliter 

 stiiata, anfractibus primis subcoronatis, ultimi margine postico rotundato an- 

 guloso, ad basin striato ; apertura ampla, postice rotundato-emarginata ; canali 

 subreflexo. 



A variable species ; at the same time it cannot be confounded with 

 any known species. 



CONUS symmetricus. Pl. IX. fig. 1. 



Testa turbinata, crassiuscula, breviuscula, granulosa, spira brevi, spiraliter striata, 

 anfractuum marginibus angulatis ; ultimo anfractu zonis angustis, pluribus, ele- 

 vatis, granosis, lateribus aequalibus, canali subproducto, leviter reflexo. 



A beautiful small Cone, having the last volution covered with gra- 

 nular zones. 



CoNUS STENOSTOMA. 



Testa turbinata, regularis, crassa, laevigata, spira mediocri, subacuminata, lineis 

 incrementi obsoletis solum conspicuis ; anfractibus primis leviter subcoronatis, 

 ultimo postice angulato, mediane et antice transversim lirato, liris subdistanti- 

 bus, subprominulis ; apertura angusta, labii externi sinu postico magno. 



Remarkable for the narrowness of its mouth and the great size of the 

 posterior sinus of the outer lip, as evidenced by the lines of growth on 

 the spire. 



CoNUS PLANILIRATUS. 



Testa turbinata, crassa, transversim sulcata, spira breviter acuminata, Isevi, sub- 

 striata ; anfractu ultimo liris elevatis, numerosis, confertis, superne planis 

 cincto ; interstitiis longitudinaliter tenerrime striatis. 



About twenty prominent, flat-topped ridges may be counted on the 

 last volution. 



CONUS MARGINATUS. 



Testa subturbinata, utrinque subsequalis, sulcata, spira conica, subacuminata, an- 

 fractuum marginibus prominulis ; anfractu ultimo transversim costellato, costel- 

 lis 16 acutangulis. 



Deeply grooved externally, and having the edge of the volutions 

 composing the spire rather prominent. 



