28 BIOLOGICAL SURVEY OF 



When the Survey is completed, the original records 

 together with the type specimens will be deposited with The 

 Academy of Natural Sciences, Philadelphia. 



This publication is not intended to be a complete list of all 

 species which have been recorded from this district, but only 

 such as have been found as a result of the work carried on 

 by the Survey or for which the exact locality of capture is 

 known. All references or records which appear to be in any 

 way questionable have been deliberately omitted. It is hoped 

 that in the further -work of the Survey some forms which 

 should be found in this latitude will be checked up. This seems 

 preferable to entering a record which may be false and less 

 readily corrected. 



In connection with the comparatively few references given, 

 it is well to call attention to the ever-widening circle of refer- 

 ences. Each reference which we give is in itself a source of 

 additional earlier references, and each of those is a source 

 of still further references, so that one very soon, by following 

 out this circle of references, gets in contact with the bulk of 

 literature on a given field. 



It has not, however, been thought necessary in all cases to 

 give a detailed description, as it would be merely a repetition 

 of information published elsewhere. By supplying in each 

 case a reference to a good description taken from a recog- 

 nized monograph of a group, preference being given to one 

 with illustrations, I consider that this phase of the work has 

 been amply covered; and concerning the question of nomen- 

 clature we have endeavored to eliminate all error as regards 

 the precise species which the name is intended to indicate. 



With the exception of the Foraminifera, Echinodera, Hiru- 

 dinea, and Arthropoda, which have been identified by 

 Dr. Charles H. Blake, I have personally checked up or identi- 

 fied all the species herein classified and described. In cases 

 where there was the slightest doubt the specimens were sub- 

 mitted to a specialist for critical examination. I am there- 

 fore perfectly confident that the animals dredged by us have 

 been accurateh^ identified. 



