VISSVREl.LIDyE. LS9 



the foramen, which is bordered with blue, presents a striking pecu- 

 liarity in this shell, which otherwise resembles F. alabastrites. 



35. nodosa (f. 59), Bom. — Ovali-subrotunda, elevata, pallida, 

 lateribus convexis,costis elevatis nodulosmagnos ferentibus radiata ; 

 foramine subcentrali, ovali, medio contracto. Obs. The well- 

 known species with large nodules on the ribs. 



36. Humphrevi (f. 61), Rve. — F. nodosa simili, sed costis no- 

 duliferis, minoribus, alternatim minimis, interstitiis cccruleis. 

 Obs. The nodulous ribs much less prominent and alternating in 

 size. 



37. conoides (f. 51), Rve. — Ovali, cnissa, rugosa, irregulariter 

 costata, alba, intus viridi; foramine ovali, nigro marginato. Obs. A 

 conical white species, green within, and having a black ring round 

 the fissure. 



38. obtusa (f. 75, 76), Sowb. — Ovali, convexa, leviter costata, 

 costis albis distantibus et interstitiis striatis roseis vel rubris radi- 

 ata ; intus viridi ; foramine parvo, paulo supra medium posito. 

 Obs. Has the sides convex like Humphreyi, with distant white ribs 

 and red striated interstices ; the inside is green, and the foramen 

 small. 



39. Barbadensis (f. 49, 144-146), Gmel. — Ovali, postice 

 paululum attenuate, alba vel pallide fulva, fasciis uigris vel rubris 

 plus minusve interrupts variegata, costis crassis imbricatis rugosis 

 insequalibus radiata; intus viridi ; marginc laqueato ; foramine paulo 

 supra medium posito, parvo, subquadrato. Obs. The ribs on this 

 species are irregular and unequal, imbricated with little exfolia- 

 tions, colouring and markings variable, but always green inside. 

 F. editiu, Kve. (f. 49), is slightly more depressed, attenuated in 

 front, and characterized by smaller ribs. 



40. radiata (f. 48, 50), Lamk., Sowb. — Quam F. Barbadenm 

 magis dcpressa, postice attenuata; costis minime imbricatis. Obs. 

 Variety f. 49 of Barbadensis approaches this species in the form, 

 which is more depressed and attenuated in front; but in this 

 species the ribs are not imbricated. It is betu-r to adopt the 

 late G. B. Sowerby's identification of this Lamarckian species, with 

 the description of which it agrees pretty accurately, than to give 

 it a new name, as Mr. Reeve has done. 



41. rugosa (f. 46, 47), Sowb. — Ovali, valide eompressa, postice 

 attenuata, costis rugosis insequalibus quarum tribus anticis maximis 



VOL. III. Z 



