MUSEUM OF COMPAKATIVE ZOOLOGY. 37 



Cadulus carolinensis Bush. 

 Cadulus Bushii Dall. 

 Cadulus Agassizii Dall. 

 Cadulus lunula Dall. 

 Cadulus obesus Watson. 

 Cadulus amiantus Dall. 

 Cadulus cucurbita Dall. 

 Cadulus acus Dall.* 

 Cadulus minusculus Dall.* 



This list contains about four hundred and seventy species and varieties col- 

 lected by the " Blake," to which may be added those enumerated in Part I, 

 making a total of about seven hundred species, with which, in both papers, 

 between two and three hundred related forms are compared or differentiated, 

 making a total of nearly one thousand species, more or less fully discussed in 

 this Report. Of those in Part I, eighty-one species, seven varieties, and twelve 

 groups of higher value were regarded as new. In the present paper three 

 hundred and eighty-five species and varieties, and thirty higher divisions, are 

 treated as new, making a total for this Report of four hundred and seventy- 

 three species and varieties, and forty -two genera, subgenera, or sections dis- 

 criminated for the first time among the Brachiopods, Pelecypods, Gastropods, 

 and Scaphopods collected by the Blake, or illustrating the fauna investigated 

 in the work of the Blake. In addition to these, there are about twenty species 

 of Nudibranchs in the hands of Dr. R. Bergh, of Copenhagen, to be reported 

 upon ; the Pteropods and other floating pelagic forms have not been studied, 

 while the report by Professor Verrill on the Cephalopods has been some time 

 published, and includes some ten or twelve species. 



The magnitude of this contribution to our knowledge of the Mollusks of the 

 region, due to the exertions of Professor Agassiz, Pourtales, Sigsbee, Bartlett, 

 and their co-workers, is very evident. But the writer may fairly add that the 

 value of the work consists not merely in having added nearly five hundred new 

 forms to the known fauna, and materially enlarging our list of genera ; but, 

 to an equal or greater extent, in the knowledge gained of the organization and 

 structure of some of the most interesting Mollusks known. There is in this 

 Report material enough to reward the attention of naturalists, both of the 

 systematic and the purely morphologic schools, to whose appreciative and 

 impartial criticism it is respectfully offered by the writer. 



