252 DAllONIA. 



depressa, solidiuscula, alba, late et profunde umbilicata; spira 

 proininula ; anfractibus subconvexis, supra lsevibus, infra concen- 

 trice sulcatis, umbilico carina prominente circumcincto. Obs. A 

 species of simple sculpture, of very elegant form, described by 

 P. P. Carpenter from the seas of China. 



14. anaglypta (pi. 255, f. 28, 29), A. Ad.— Testa depresso- 

 turbinata, alba, nitida, profunde et late umbilicata ; spira elatius- 

 culfi ; anfractibus rotundatis ; carinulis concentricis acutis crenu- 

 latis ; interstitiis lineis radiantibus late clathratis ornatis, basi cari- 

 nulis confertis denticulatis instructis; umbilico magno, intus 

 radiatim lirato ; apertura orbiculari, margine crenato. Obs. A 

 very beautiful, richly-embossed shell, with a style of sculpture very 

 much resembling that of C. Beeviaiia, but the form is more tur- 

 binate than in that pretty species. 



15. ammonoceeas (pi. 255, f. 21, 22), A. Ad. — Testa de- 

 presso-turbinata, discoidea, late umbilicata, alba, solida, concen- 

 trice striata, radiatim costata ; costis tenuibus, subdistantibus, ad 

 suturas evanidis ; anfractibus rotundatis ; apertura circulari ; pe- 

 ritremate continuo ; labio callo parvo resupinato instructo. Obs. 

 The only species resembling this is C. Schrammi, Fisch., from 

 Guadeloupe, which has the same remarkable Comu-Ammonis 

 appearance, but the whorls of which, instead of being rounded, 

 have two concentric keels which gives the species, says M. Fischer, 

 the appearance of Planorbis crisiatus, with three rows of spines. 



16. bipoecata (pi. 255, f. 30, 31), A. Ad.— Testa parva, 

 subdiscoidea ; spira depressa, albida, late umbilicata; anfractibus 

 3, subplanulatis, ultimo antice dilatato, supra lsevi, infra con- 

 centrice striato, ad peripheriam liris duabus validis transversis in- 

 structo ; apertura circulari ; peritremate continuo, simplici. Obs. 

 This little species differs from any of those described, and may 

 easily be recognized by the double keel which surrounds the 

 periphery. 



Subgenus Daeonia, A. Ad. 



Shell orbicular, discoidal, evolute, spire depressly concave; 

 whorls rounded, more or less disunited; aperture circular; peri- 

 treme continuous. Obs. I have considered it advisable to keep 

 this as a distinct subgenus, on account of the very peculiar form 

 and sculpture of the shell. The type species greatly resembles 

 Ammonia spirilla, L., or Spirilla aaslralis, Lam. 



1. spieula (pi. 255, f. 32, 33), A. Ad. — Testa orbicularis, dis- 

 coidea, evoluta; spira depresso-concava ; anfractibus rotundatis, 



