BULLETIIiT 111, UNITED STATES NATIONAL MUSEUM. 



rial has also been received from the Tomas Barrera expedition to 

 western Cuba, furnishing probably a very complete series of the 

 shallow-water forms of Cuba. Finally, a share of the material taken 

 by the State University of Iowa Expedition to the Barbados in 1918 

 has been added to the national collection. 



It was the attempt to identify and classify this 20 years' accumu- 

 lation of new material that led to a review of the whole collection, 

 which, in turn, furnishes the subject matter of this paper. The 

 following new species and subspecies are herein described: 



Dentalium laqueatum regulare. 

 Dentalium, texasianum cesium. 

 Dentalium, texasianum rioense. 

 Dentalium gouldii portoricense. 

 Dentalium gouldii colonense. 

 Dentalium reheccaense. 

 Dentalium entale stimpsoni. 

 Dentalium agile subagile. 

 Dentalium occidentale georgiense. 

 Dentalium ceratum Jlavum. 

 Dentalium ceratum tenax. 

 Dentalium bartletti. 

 Dentalium tubulatum. 

 Dentalium meridionale jamaicense 

 Dentalium meridionale verrilli. 

 Dentalium floridense. 

 Dentalium amaliense. 

 Dentalium sowerhyi pelliceri. 

 Entalina quadrata. 

 Siphonodentalium striatinum. 

 SipTionodentalium verrilli. 

 Siphonodentalium, occidentale. 

 Siphonodentalium hushi. 

 Cadulus quadridentatus acompsus. 



Cadulus catharus. 



Cadulus parvus. 



Cadulus foweyensis . 



Cadulus portoricensis. 



Cadulus rushi arne. 



Cadulus providensis. 



Cadulus elongatus. 



Cadulus greenlawi. 



Cadulus arctus. 



Cadulus hraziliensis. 



Cadulus simpsoni. 



Cadulus nitidus. 



Cadulus miamiensis. 



Cadulus mayori. 



Cadulus iota. 



Cadulus subula. 



Cadulus verrilli. 



Cadulus regularis. 



Cadulus atlanticus. 



Cadulus transitorius. 



Cadulus transitorius harhadensis. 



Cadulus platensis. 



Cadulus podagrinus. 



Cadulus halius. 



Cadulus tersus. 



Cadulus elephas. 



Before proceeding to the consideration of the genera and species I 

 wish to make grateful acknowledgment to the officials of the United 

 States National Museum for the privilege accorded me to consult and 

 freely to use the great collection of Scaphopods in their care, and for 

 their courtesy and invaluable aid rendered me in the preparation of 

 this paper. 



I am also greatly indebted to Dr. Henry A. Pilsbry, curator of the 

 conchological section of the Philadelphia Academy of Sciences, for 

 the generous loan of the Academy collection of Denialia and Caduli, 



