Sec. 4. Spirally ribbed or striated ; outer lip diffuse ; columella Jlai- 

 tened or concave. 



H. pulchella, Tankervillii, virginea, globosa, costata. 



Sec. 5. Globose ; outer lip confluent xoitk the columella ; inner lip 



thin. 



H. zonata, lutea, variegata, neriteila, picta, variabilis, Antil- 

 lanira, occidentalis. Guadaloupensis, maculata, polita, similis, 

 parva, globulosa, maxima, ambeliana, Zephyiina, pellucida, flavida. 



Sec. 6. Columella as in Sec. 5 ; shell pyramidal. 

 H. Trochulina, conica, elongata, elegans, rupestris, Sloanii. 



Sec. 7- Shell carinated ; outer lip conjluent zvith the columella. 



H. acutissima, Trochiformis, Oxystoma, Carocolla, aggluti- 

 nans, Lazarus, viridis, candeana, carinata, RotelJa, pilosa. 



Sec. 8. Shell depressed ; columella angulaled. 



H. Rhodostoma, angulata, fulva, Brasiliensis, syivatica, oresi- 

 gena. 



Sec. 9. Shell horny ; columella rather angulated, or slightly notched ; 

 cuter lip scarcely thickened. 



H. orbiculata, cornea, castanea, nitida, rotunda, rainuta, vestita, 

 rugosa. 



DESCRIPTIONS. 



Sec. I. Lip thickened, sinuous, depressed at the base of the columella. 



Sp. 1. H. AURANTiA,(pl.i. f. 1, 2.) Gray, Zool. Journ. i. p. 69. 



Testa globosa, laevi ; labio externo reflexo, crasso, in medio 



sub-exparjso, postice et antice depresso ; labio interno crasso, ex- 



paiiso ; columella lata complanata. 



The peritreme of this globular shell is generally of a light 

 orange colour; it is thick, and the outer lip is depressed above, and 

 at its union with the columella, which is broad and flattened. 



Jamaica. 



2. H. Jamaicensis, (pi. i. f. 3, 4.) nobis. 



T. H. aurantiae simillima, sed magis conica, et magis tenui ; 

 peritremate pallidiore, minCis incrassato. 



More conical than the last, with the edge of the aperture thinner. 

 It may be only a variety. 



3. H. H^MASTOMA, (pi. i. f. 5, 6. pi. iii. f. 98.) Moricand. 

 Mem. Coq. terr. et. fluv. de Bahia. 



T. H. aurantiae simiii, sed anfractibus superne striatis ; colu- 

 mella sub-angulata. 



Our first two figures of this shell were copied from those giren 



