﻿MONOGRAPH OF THE ATLANTIDAE. 



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NOTE I. 



SYSTEMATIC MONOGRAPH OF THE ATLANTIDAE 

 (HETEROPODA) WITH ENUMERATION OF THE 

 SPECIES IN THE LEYDEN MUSEUM 



Dr. J. J. TESCH. 



(With plates 1—5). 



Having receiitl}^ ^) tried to bring some order into the 

 great confusion, existing in the systematic literature on the 

 Heteropods, and to eliminate some of the difficulties, which 

 the investigator of this group of animals is sure to encounter 

 with, I have been convinced, more than anybody else, that 

 my study could have nothing but a provisional value, and 

 that a firmer base could only be obtained by means of 

 continued labour, and comparison of more material. 



For a systematic revision I have chosen the family 

 Atlantidae. These animals with their tiny, inconspicuous 

 shells, have received but little attention, and after Souleyet's 

 memorable work, more than half a century ago, only very 

 few naturalists have dealt with the group. Among them 

 I may name Gould, Smith, Oberwimmer, Vayssiere and 

 myself. Yet it may safely be said, that the discrimination 

 of the species is perhaps more difficult than in any other 

 family of the Heteropods. 



Mr. P. J. Buitendijk presented, shortly ago, to the 

 Museum, a collection of plankton, brought together, almost 



1) J. t). Tesch. Die lleteropoden der Siboga-Espedition, Siboga-Expeditie, 

 Monogr. LI. 190G. 



Notes from tlae Ley den ^Museum, ^"ol. XXX. 



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