P I R E N A . 



Plate II. 



Species 6. (Mus. Cuming.) 



Pikena maura. Pir. testa cylindraceo-oblonga, anthra- 



cind, anfractibus qualuor, delude decollatd, subangus- 

 tls, rotundatis, llris tenuibits confertis, senls, superne 

 clngulatls ; aperturd parvd, sinubus fere obsoletls. 



The negro Pirena. Shell cylindrically oblong, coal- 

 black, whorls four, theu decollated, rather narrow, 

 rounded, encircled with about half-a-dozen close-set 

 ridges at the upper part ; aperture small, notches al- 

 most obsolete. 



[lab. West Africa. 



A solid blue-black shell, decollated in all the specimens 

 I have seen, so as to leave but four whorls, which are en- 

 circled round the upper part with about half-a-dozen fine 

 corded ridges. 



Species 7. (Mus. Cuming.) 



Pirena lingulata. Pir. testa obeso-subulald, solldd, 

 castaneo-nigrd, ad suturas ferrugined, anfractibus con- 

 tiexo-planatls, law litis ; aperturd parvd, shin superlorl 

 lata, prof undo, labro attenuato-effuso, linguaformi. 

 The tongued Pirena. Shell stoutly subulate, solid, 

 chestnut-black, rusty at the sutures, whorls convexly 

 flattened, smooth ; aperture small, upper sinus broad 

 and deep, lip attenuately effused, tongue-shaped. 

 Hab. West Africa. 



A smooth chestnut-rust shell, agreeing in this respect 

 with the Melania of the same district. The upper sinus 

 of the aperture is unusually large, and the lip being un- 

 usually attenuately effused, protrudes like a tongue. 



Fig. 8. (Mus. Lea.) 



This uncoloured figure, copied from Mr. Lea's Basistoma 

 Edwardsil, belongs more properly to a subdivision of Me- 

 lanin, distinguished by Mr. Swaiuson with the title of 

 Hemislnus, and will be described with that group. 



Species 9. (Mus. Cuming.) 



Pirena spinosa. Pir. testa turritd, suiventrlcosd, in- 

 tense brunned, nltente, anfractibus quinque, deinde 

 decollatd, superne concaw-canallculatls et striatis, 

 deinde Iambus, ad angulum tuberculis acutis murlcato- 



squamatls distantlbtis consplcue coronatls, anfractu 

 ultimo litis valldis quatuor ad quinque basi cingulato ; 

 aperturd subampld, sinu lato, profundo, labro atte- 

 nuato-effuso, margine columellarl lamlnarl-reflexo, ru- 

 bido. 



The spined Pirena. Shell turreted, somewhat ventri- 

 cose, deep-brown, shining, whorls five, then decollated, 

 concavely channelled and striated round the upper 

 part, then smooth, prominently coronated on the angle 

 with distant, sharp, prickly-scaled tubercles, last 

 whorl encircled with four to five strong ridges at the 

 base ; aperture rather large, sinuses broad and deep, 

 lip attenuately effused, columellar margin laminarlv 

 reflected, tinged with red. 



Lamarck, Anim. sans vert. vol. viii. p. 500. 

 Pirena Madagascariensis, Enc. Meth. 

 Melanopsis spinosa, Deshayes. 



Hab. Madagascar. 



The tubercles of this fine species are remarkably cuspid, 

 each being surmounted with a minute, sharply beaked, 

 horny scale, such as in Melania setosa is erected "behind 

 the bristled lashes. 



Species 10. (Fig. a, b, Mus. Cuming.) 



Pirena fluminea. Pir. testa turrlculatd, ferrugineo- 

 fuscd, anfractibus quinque, delude decollatd, strlls ele- 

 valk nndlque dense funiculatis, superne concavo-subex- 

 cavatis, longitudlnalller pllcato-liratls, llrls ad angu- 

 lum. murlcato-squamatls ; aperturd subampld, profunde 

 slnuatd, margine columellarl lamlnarl-reflexo, rubldo. 



The river Pirena. Shell turriculated, rusty-brown, 

 whorls five, then decollated, corded throughout with 

 close-set raised striae, slightly concavely excavated 

 round the upper part, longitudinally plicately ridged, 

 ridges prickly-scaled on the angle ; aperture rather 

 large, deeply sinuated, columellar margin laminarly 

 reflected, tinged with red. 



Gmelin, Syst. Nat. p. 3603. 



Hab. Madagascar. 



Probably a variety of the preceding species, though 

 densely sculptured throughout with raised striae, with the 

 prickly ridges less defined and more frequent. 



November, 1859. 



