190 EEV. R. T. Lowe's list of shells 



With a view to confirm the accuracy of tlie foregoing correc- 

 tions, and to supply materials to Mogadorian or Canarian obser- 

 vers for further researches, and for tlie probable discovery on 

 their shores of more than this one Gymhium, I subjoin a con- 

 spectus of the characters and synonyms of several of the more 

 nearly allied species, as understood by me. 



1. Cymbium Olla (L.). 

 Volufa Olla, L.= F. Neptuni, Gm., Lam, 



Plaits of pillar 4 ; shell proportionately thin and light, globose, 

 ovate, short, inflated, ventricose ; spire very short and obtuse, its 

 mammilla indistinct, depressed, and suture obsolete, nearly or 

 quite closed ; shoulder (at top of outer lip) angular, erect, slightly 

 prominent, rising above the spire into a short, acute, erect angle 

 or point ; inner lip (above the four plaits) distinct and defined ; 

 aperture reaching to or beyond the level of the apex, efluse. Colour 

 plain fulvous-fawn or olive-brown ; when young, usually mottled 

 with pale]' or whitish spots. 



Adult : Valuta Olla, Linn. Syst. ed. 12. 1196 ; Hani. Conch. 

 Linn. 237. V. Nej)tuni, Lam. ed . 2. x. 379. CymhaNeptuni, Sowerb. 

 Sp. Conch, p. 5. if. 2 c, d. Cymhhim persicum, Patera Neptuni, Mart. 

 iii. 51. t. 71. f. 767. L'Tet, Adans. 44. t. 3. f. 1. Tetus Neptuni, 

 Gray in Proc. Zool. Soc. 1855, p. 52. 



YoTJKG or Pull. : TblutaNavicula, Gmel. Yetus Namcula,GTaj, 

 I. e. 51. V. Neptuni pull., Sowerb. Gen. f. 1 ; Sp. Conch, f. 2 a, h ; 

 D'Orb. in W. B. ii. 2. 85. Cymbium persicum mactdatum. Martini, 

 iii. 52. t. 71. ff. 768, 769. 



Sal. "African Ocean and Persian Gulf," Lam.; "African 

 Ocean," /So^fer&. ; Senegal, ^(/ffw*. ; " Lanzarote " (i. e. opposite 

 coast of Africa), Welh ; West Coast of Africa, Gambia, Gray. 



D'Orbigny's typical Canarian specimen of his V. Neptuni, in the 

 British Museum, is certainly nothing (as before afiirmed) but a 

 wretched bleached and battered shell of V. ruliginosa, Sw. Tet 

 I possess a smaU mottled young example of the true V. Neptuni, 

 Gm.(= V. Navicula, Gm.), 2 inches long by 1 inch and 5 lines 

 broad, sent to me by AVebb, in 1829, from Lanzarote, which, 

 though doubtless of African origin, suffices to forbid the quota- 

 tion of V. Neptuni, D'Orb,, in W. B. ii. 2. 85, together with his 

 V. porcina, under C. ruhiginosum (Sw.), var. /3, with which, how- 

 ever, the existing types of both his species in the British Museum 

 are all equally identical. For this, his record of the species as a 



