.^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. Mm.). 



AvicuLA HiRUNDO (Liun.). 



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



Pecten coRALLiNOiDES, d'Oibigny. 



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

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

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



Hab. Canarj- 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 ohliqua, iiicEquilateralis, cequivalvis, mediocriter convexn, 

 albida veljlavescens,supra castas rufo vet roseo tincta et maculata, 

 costis 7-oiundatis circiter \G,sulcos iynmaculatosmodice profundos 

 (squantibus, instructa, inter et supra castas liris tenuibus, minute 

 squamosis, ornata ; auriculce parvte, incequales, jwstica valvce 

 dextra' oblique declivis, liris tenuibus radiantibus .5-7 instructa, 

 antica paulo major, radiatim lirata, minute squamosa, inferne 

 vix sinuata ; auriculce valvce sinistrce liris tenuibus, paucis, 

 squamatis, ornatce ; pagina interna Jlavo-albida, plus minus 

 rubicunda. 

 Lanyit. 29 miJlim., 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 

 beautiiul 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, rvfescens vet 

 rosacea, maculis albis, lineisque gracilibus, zigzaqformibus, 

 j)urpu7-eis, ornata, costis radiantibus, tenuibus, auranlio-riifis, 

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

 pulcherrime lamellata ; valva canvexa, mediocriter profunda 

 vel purpurea, apicem versus pallida vel albida, inter castas 

 pwpureo tincta, costis paulo latioribus et planioribus quani in 

 valva superiore ; auriculce parvce, plus minus purpurea tinctce ; 

 pagina interna valvce profxindce alba, fusco-purpurea marcjinata, 

 V. plancR in medio aurantio vel roseo, et ad marginem jnirjmreo 

 tincta. 



Lavffit. et latit. .32-34 millim. 



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

 raised lamelliform lines of growth are the chief distinguishing 



