AUTHOR 8 ABSTRACT OP THIS PAPER ISSUED 

 BY THE BIBLIOGUAPHIC SERVICE, OCTOBER 2 



SOME OBSERVATIONS ON QUALITATIVE CHEMICAL 

 AND PHYSICAL STIMULATIONS IN NUDIBRANCHI- 

 ATE MOLLUSKS WITH SPECIAL REFERENCE TO 

 THE ROLE OF THE 'RHINOPHORES'^ 



H. P. KJERSCHOW AGERSBORG 



University of Nebraska, Lincoln, Nebraska 



TWO FIGURES 



INTRODUCTION 



The purpose of the investigation upon which this paper is 

 based was to determine the exact function of the dorsal tentacles 

 which have come to be considered as organs of smell, and are 

 generally called 'rhinophoria.' 



Early writers on nudibranchiate mollusks, Alder and Hancock 

 ('45, p. 19), Hancock and Embleton ('52, p. 242), Jeffreys ('69), 

 ascribed to the dorsal tentacles the function of olfaction, and 

 Bergh ('79), agreeing with these authors, employed the term 

 rhinophoria. In fact, Tapparone-Canefri ('76) suggested this 

 term for Melibe papillosa De Filippi, caUing the Hentacula' 

 rhynophoria. Also later writers, Fischer ('87), Pelseneer ('06) 

 (Prof. E. Ray Lankester's ''A Treatise on Zoology"), seem to 

 agree on this point. Hescheler ('00), however, uses the term 

 ' Kopf tentakel' (Prof. Arnold Lang's "Lehrbuch der vergleichen- 

 den Anatomic der wirebellosen Thiere"). Copeland ('18) thinks 

 that the snails Alectrion obsoleta and Busycon canaliculatum 

 are as successfully directed toward distant food by means of an 

 olfactory apparatus consisting of a single organ of smell, asso- 

 ciated with a siphon terminating in a shifting ' nostril' for samphng 

 the surrounding w^ater and its contents, as anirnals with paired 

 olfactory organs and fixed nostrils. But Arey ('18) disagrees with 



'From Puget Sound Biological Station, Friday Harbor, Washington; and 

 contribution from the Zoological Laboratory, of the University of Illinois, under 

 the direction of Henry B. Ward, no. 206. 



423 



THE JOURNAL OP EXPERIMENTAX, ZOOLOGT, VOL. 36, NO. 4 



