r!06 MR. E. A. SMITH ON THE [Apr. 1, 



Pinna pernula, Chemnitz. 



Pinna pernula, Chemn., Reeve, Conch. Icon. pi. 12. figs. 22 a, b. 



Hub. St. Croix, West Indies {Chemnitz) ; Madeira {Brit. Mus.). 



AVICULA HIRUNDO (LiuU.). 



Hah. On the sea-beach, St. Helena {Melliss). 



Pecten corallinoides, d'Orbigny. 



Pecten corallinoides, d'Orb. in Webb & Berthelot's Hist. Nat. 

 Canaries, MoUusques, p. 102, pi. 7b. figs. 20-22 ; Sowerby, Thes. 

 Conch, vol. ii. p. 65, pi. 12. figs. 3, 4. 



Hab. Canary Islands, Cape Verde Islands. 



This striking species has not previously been recorded from so 

 southern a locality. 



Pecten atlanticus. (Plate XXII. figs. 9-9 b.) 



Testa obliqua, incequilateralis, cequivalvis, mediocriter co?ivexa, 

 albicla veljiavescens, supra castas rufo vel rosea tincta et maculata, 

 costis rotundatis circiter 1 G, sulcos immaculatosrnodice profundos 

 aquantibus, instructa, inter et supra costas liris tenuibus, minute 

 squamosis, ornata ; auriculce parvce, incequales, postica valvcB 

 dvxtra oblique dedivis, liris tejiuibus radiantibus .5-7 instructa, 

 antica paulo major, radiatini Virata, minute squamosa, inferne 

 vix sinuata ; auriculce valves sinistrce liris tenuibus, paucis, 

 squamatis, ornatce ; pogina interna Jiavo-albida, plus minus 

 rubicunda. 

 Longit. 29 millim., diam. 15, alt. 29. 



This species is remarkable on account of its oblique form, which 

 is produced by the posterior slope being longer than the anterior. 

 The angle at the apex, formed by the dorsal slopes, is about equal 

 to a right angle. The surface is rough to the touch through the 

 beautitul wavy lines of growth which everywhere adorn the surface, 

 and, upon the ridges, become minute scales. 



Pecten (Janira) turtoni. (Plate XXII. figs. 10, 10 a.) 



Testa rotundata ; valva plana leviter concava, 7-ufescens vel 

 rosacea, maculis albis, iineisque gracilibus, ziyzagformibus, 

 purpureis, ornata, costis radiantibus, tenuibus, aurantio-riijis, 

 circiter 17-19, instructa, lineis incrementi confertis, elevatis, 

 pulcherrime lamellata ; valva convexa, mediocriter profunda 

 vel purpurea, apicem versus pallida vel albida, inter costas 

 purpurea tincta, costis paulo latioribus et planioribus quam in 

 valva superiore ; auriculce parvee, plus minus purpurea tinctce ; 

 pagina i7iterna valvce profundce alba, fusco-purpureo marginata, 

 v. planes in medio uurantio vel rosea, et ad marginem purpureo 

 tincta. 



Longit. et latit. 32-34 millim. 



The fine ribs, the comparatively small auricles, and the beautiful 

 raised lamelliform lines of growth are the chief distinguishing 



