FISSUEELLA— Plate VI. 



Species 38. (Mus. Cuming.) 



FissuEELLA GKISEA. Fiss. testd ovata, depressiusculd, 

 lavigatd, lineis concentrkis incrementi subirregulariius, 

 orificio parviuscttlo, ohlongo ; cinereo-grised, bMin 

 versus violaced, obscure radiatd. 



The geey Fissueella. Shell ovate, rather depressed, 

 smooth, concentric lines of growth somewhat In-egular, 

 orifice rather small, oblong, ash gi-ey, violet towards 

 the base, obscurely rayed. 



Hah ? 



This species has no sculpture to characterise it, but the 



colouring is peculiar. 



Species 39. (Mus. Cuming.) 



Fissueella apeeta. Fiss. testd uvatd, crassd, depressius- 

 culd, concentrice creberrime elevato-striatd, interstitm 

 incisis, orificio ovato, peramplo ; violaceo-cimrascente, 

 violaceo-nigricante irregulariter radiatd, basi albi-mar- 

 ginatd. 



The open Fissueella. Shell ovate, thick, rather de- 

 pressed, concentrically very closely elevately striated, 

 interstices engi-aved, orifice ovate, very large; pale 

 violet ash, rayed irregularly with violet-black, edged 

 with white at the base. 



SowEEBY, Tankerville Catalogue, App. p. vi. Conch. Illus. 

 f. 10. (sub nom. F. Idautula). 

 Pupillaa aperta, Gray. 

 Fissurellidea megairema, D'Orbigny. 



Hab. Ensenada de Kos, Coast of Patagonia ; D'Orbigny. 



Notwithstanding that Lamarck refers to Bom's vignette 

 of this species for his F. hiantula, it is certainly distinct 

 from that which served for his description. Lamarck's 

 F. hiantula is the species which Mi'. Sowerby assigns to 

 F. Javanicauis, and is well characterised by the remark : — 

 " etant posee sur son ouverture, elle ne s'appuie que sur 

 ses deux cotes." 



Mr. Sowerby's original view of this species appears to 

 be the conect one ; and his remark that " the depressed 

 white margin is probably caused by the mantle of the 

 animal overlapping the edge of the shell " is confirmed by 

 M. D'Orbigny's figiu-e. Voyage dans I'Amer. Merid. Moll. 

 pi. 63. showing that the animal is of very large size, with 

 the shell only occupying a small portion of the back, into 

 the flesh of which it is imbedded to the depth of the 

 uncolom'ed edge. 



Species 40. (Mus. Cuming.) 



Fissueella Mexicana. Fiss. testd oblomjo-omtd, de- 

 pressd, lateribm compressiuseuld, radiatim sulcatd, liris 

 hitermediis incrementi lineis concentricis decussatis, 

 orificio oblongo, latiusculo, medio subcontracto ; pur- 

 piireo-rufd, suhobscure nigro radiatd, albd circa orifi- 

 ciiim. 



TuE Mexican Fissueella Shell oblong ovate, de- 

 pressed, a little compressed at the sides, radiately 

 grooved, intermediate ridges decussated with concen- 

 tric lines of increase, orifice oblong, rather broad, 

 slightly contracted in the middle ; purple red, some- 

 what obscurely rayed with black, white round the 

 orifice. 



Sowerby, Conch, nius. Fissurella, Cat. p. 8. no. 07. f. 61. 



Hab. Real Llejos, Mexico ; Cuming. 



The orifice of this species is characterised e.vternaUy by a 

 very decided white border. 



Species 41. (Mus. Cuming.) 



Fissueella nigkita. Fiss. testd ovatd, depressiusculd, 

 lateribus compressd, extremitatibus levatd, radiatim- 

 subtiliter liratd, concentrice striatd, orificio ovali, per- 

 amplo ; intense cinereo-fuscd, obscurl nigro radiatd. 



The dingy Fissueella. Shell ovate, rather depressed, 

 compressed at the sides, lifted at the extremities, ra- 

 diately finely ridged, concentrically striated, orifice 

 oval, very large ; dark ash brown, obscurely black- 

 rayed. 



Sowerby, Pro. Zool. Soc, 1834, p. 137. 



IM. ? 



Closely allied to F. hiantula, but the orifice is larger 



and not contracted at the sides. 



Species 42. (Mus. Cuming.) 



Fissueella fulvescens. Fiss. testd oblongo-ovatd, au- 

 tice sttbattenuatd, depressd, subtilissime radiatim et 

 concentrice striatd, orificio oblongo ; vivid} fulvd, lacco 

 pulcherrim£ radiatd. 



The fulvous Fissueella. Shell oblong-ovate, slightly 

 attenuated anteriorly, depressed, very finely radiately 

 and concentrically striated, orifice oblong ; bright 

 yellow, beautifully rayed with lake. 



Sowerby, Pro. Zool. Soc, 1834, p. 137. 



Hab. Valparaiso (under stones on the shore) ; Cuming. 

 From the bright yellow colouring of this shell, the rays 



have very much the appearance of sun-beams. 



