154 UNIDENTIFIED LIMPETS. 



P. lineata LAM., An. s. Vert, vi, p. 331. DELESSERT, Rec. de 

 Coq. t. 28, f. 6. 



I do not recognize Delessert's figures of the type of this species. 

 Deshayes (in Lam. 2d. edit.) gives no additional information, as 

 he did not have access to Lamarck's cabinet. 



H. NIMBUS Reeve. PI. 35, figs. 30, 31. 



I have described this under Acmcea, page 61, but it may be a 

 Helcioniscus. I have not seen the species. 



Spurious, Unidentified and Unfigured Limpets. 



The following list consists mainly of such species as I have been 

 unable to identify with known forms, and which seem to me fairly 

 unidentifiable. A certain proportion of the number I have identified 

 with certainty ; and others with doubt, as will be seen by my notes 

 below. 



It will be understood that I have no desire to revivify names or 

 species which have passed from the memory of man. It is at least a 

 half century too late for that. It is not too late, however, to avoid 

 the use of these dead names for new forms. The frequent duplica- 

 tion of specific names in Patella has shown the necessity of a com- 

 plete list such as that here given. I have deemed it neither nec- 

 essary nor desirable to change well-known modern names which are 

 preoccupied by the old and insufficiently defined names given below, 

 although there exist a considerable number of such duplications. 



The species of Clyptrceidce, Fissurellidce, Siphonariidce and Gadi- 

 niidce, etc., included by older writers in Patella, have been excluded, 

 as far as the original descriptions have enabled me to judge of them. 



? NACELLA SUBSPIRALIS Cpr. (Proc. Cal. Acad. Sci. iii, p. 213), 

 belongs to the Siphonariidce. 



TECTURA RADIATA Pse. (Proc. Zool. Soc. Lond. 1860, p. 437), is a 

 synonym of Williamia gussoni Costa Siphonariidce. 



P. VIRIDIS Dufo (Ann. Sci. Nat. (2) xiv, p. 204, 1840). Seychelles 

 and Amirantes. Unidentified. 



P. AURIFERA Dufo (Ann. Sci. Nat. (2) xiv, p. 204). Make, Sey- 

 chelles. Unidentified. 



P. VIRGINUM Dufo (Ann. Sci. Nat. (2) xiv, p. 205). Mahe, Sey- 

 chelles. Unidentified. 



