Diagnoses of New Species and a New Genus of Mol- 



1.USKS 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 backs of several fresh Spondi/liis-\-aU'es were examined by Mr. 

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

 <\hich were deemed worthy of being added to the national collection; 

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

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

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

 placed on record, in hoj)es 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. 547-5.52, 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, 18G3, pp. 5-43 et seq. The numbers, 

 both of species and of tablets, are continued from the Mazatla.i 

 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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