Diagnoses of New Species and a New Genus of Mol- 



LUSKS FROM THE ReIGEN MaZATLAN COLLECTION : WITH 



AN ACCOUNT OF ADDITIONAL SPECIMENS PRESENTED TO 



THE British Museum. By Philip P. Carpenter, B.A., 

 Ph.D. 



After the publication of the British Museum Mazatlan Catalogue, 

 the bacics of several fresh Spondylus-vaXve.s were examined by Mr. 

 E. D Darbishire and myself. Among the specimens were several 

 tvhieh were deemed worthy of being added to the national collection; 

 thev were deposited there, with a MS. appendix to the Catalogue, 

 ill 1858. As it is not judged necessary to print this separately, I 

 have (with the permission of Dr. Gray) transcribed what should be 

 [ilaced on record, in hopes that it may not be judged out of place 

 in the ' Proceedings.' Those who use the Mazatlan Catalogue are 

 requested to observe not only the corrections in the Appendix, 

 pp. 547-552, but also those made in the Review of Professor C. B. 

 Adams's Panama Catalogue, P. Z. S. 1863, p. 339; and in the 

 British Association Reports, 1863, pp. 543 et seq. The numbers, 

 both of species and of tablets, are continued from the Mazatkii 

 Catalogue, and correspond with those in the Report. The student 

 of the Gulf fauna should also consult the account of Mr. Xantus's 



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