1921] NATURAL SCIENCES OF PHILADELPHIA. 307 



With two exceptions^" the species enumerated in Gabb's paper 

 are furnished with labels (names only) in his hand, under card labels 

 written bj'' Professor Heilprin;all of the small species were in vials, 

 the large ones loose in the trays. We found no cases of trans- 

 position of specimens, and with two exceptions" every species or 

 specimen mentioned by Gabb has been found, together with its 

 proper label. 



With two or three exceptions, none of the labels bore any indi- 

 cations of locality or horizon further than "Santo Domingo." 

 What little information exists of more definite character is contained 

 in Gabb 's paper, or sometimes may be inferred from his specific 

 names. The zonal relations of many of the species have been deter- 

 mined by Miss Maury. 



In a few cases the gangue indicates that certain species are from 

 the Orthaulax zone, which is apparently synchronous with the Tampa 

 Silex beds, while the remainder so far as we can judge is later, having 

 much in common wdth the Gatun and Bowden beds, now generally 

 considered Miocene. This was also Gabb's opinion. 



Gabb's descriptions give evidence of haste and the use of a lens 

 of low power only. Dimensions of the shells were often omitted, 

 and when given are almost invariably inexact, as though estimated 

 rather than actually measured. There are many typographical 

 errors, due to the circumstance that the paper was printed after his 

 departure for Costa Rica. He did not see the proofs. We note 

 these things merely to account for occasional discrepancies between 

 the original descriptions and the supplementary descriptive notes 

 to be found in this revision. 



Certain species not Santo Domingan have been named incident- 

 ally in the course of this work, as follows: 



Conus maculospira n.n. for ■planilirahis Sowerby. Recent. 



Conus consohrinus ultimus Pils. & Johns. Pliocene, Costa Rica. 



Conus pseudomarginatus, n. n. for C. marginatus Cossm., not 

 Sowb. Martinique. 



Xancus textilis jamaicensis. Bowden, Jamaica Miocene. 



Bursa crassa bowdenensis. Bowden, Miocene. 



Cyprcea raymondrobertsi bowdenensis. Bowden, Miocene. 



Pyramidella insularum, n. n. for P. canaliculata Sowb. Recent. 



1° " The specimens of Tellina alter nata and T. punicea (?) in the collection have 

 lost their labels; it is not certain that they are Gabb's examples, or that the former 

 is from Santo Domingo. 



