TOMLIN AND SHACKLEFORD : MARINE MOLLUSCA OF S. THOME. 269 



Chiton lyratus Sow. 

 Sowerby, Conch. Illust., f. 126 (1840). 

 Reeve, Conch. Icon., pi. xviii., f. no. 

 Sowerby, Mar. Shells S. Afr., App. p. 19. 



S. Thome, one perfect specimen and many valves ; Dakar (Dautzen- 

 berg) ; Port Elizabeth (Sowerby). 



Dentalium (Laevidentalium) gruveli (Dautzenberg). 

 Dautzenberg, Contrib. Faune Afr. Occ, I., p. 109, pi. iii., f. 21 — 23 



(1910). 



S. Thome, not uncommon ; Cansado, Pte. du Repos, B. de 

 Rufisque, W. of Cape Rouge (Dautzenberg). 



Dentalium rubescens Desh. 

 Deshayes, Mem. Soc. Hist. Nat. (Paris) II., p. 363, pi. 16, f. 23 — 25 

 (1825). 



S. Thome, common ; Canaries (McAndrew) ; Mediterranean. 

 Weinkauff and Dautzenberg wrongly call this species rufescens. 



Ostrea lacerata Hanley. 

 Hanley, P.Z.S., 1845, p. 106. 

 O. lacerans Reeve, Conch. Icon., pi. xxii., f. 51. 



S. Thome, common on rocks exposed at low water ; Senegal and 

 Morocco (Dautzenberg) ; Cape Verdes (Nobre). 



G. F. Dollfus (Quaternaire marin du Senegal, p. 64) unites to this 

 species O. stentina Payr., paticiplicata Desh., } plicahtla Gmel., cristaia 

 Hidalgo, and guineensis Dunk. If the identification is confirmed O. 

 stentina Payr. has priority (1826). O. stenti7ia is recorded from the 

 Mediterranean, Portugal, Morocco, Canaries, and Madeira. 



Fossil, at Timardine and N'Tibrau in Senegal (Dollfus). 



Most authors, probably following Reeve, quote the name of this 

 shell as lacerans. Hanley's name, however, was lacerata. 



Spondylus powelli Smith. 

 Smith, Joiirn. of Conch., vii., p. 70 (1892). 



S. Thome, rare ; Madeira ; Cape Verdes ; Canaries (Watson) ; 

 Liberia and Senegal (Dautzenberg). 



The Rev. R. Boog Watson's collection contains a specimen which 

 was brought alive to Lowe in February, 1852. 



Spondylus gaederopus L. 



Linne, Syst. Nat., ed. xii., p. 1136 (1767). 



S. Thome, common ; Cape Verdes ; Mediterranean ; Angola 

 (Nobre). 



