220 



NOTES on some points in the STEUCTUEE of the 

 CEEATA of JDendronotus arborescens. 



By Joseph A. Clubb, B.Sc. (Vict.). 



VICTORIA UNIVERSITY SCHOLAR IN ZOOLOGY ; 

 ASSISTANT-CURATOR OF THE DERBY MUSEUM, LIVERPOOL. 



With Plates XIY. and XV. 



[Read April 5th, 1895.] 



The present paper is the outcome of part of the work 

 carried on in the Zoological Laboratory of University 

 College, Liverpool, under the direction of Prof. Herdman, 

 while in residence for the period covered by the Victoria 

 University Scholarship awarded me in June, 1894. 



I. The Liver and the Cerata. 



In the Second Eeport on the Nudibranchiata of the 

 L.M. B.C. District,* drawn up by Prof. Herdman and 

 myself, attention was directed to the published descriptions 

 by Alder and Hancock! and Dr. Eudolph BerghJ of the 

 structure of the cerata oiDendronotus arborescens. These 

 distinguished zoologists described and figured the liver of 

 JDendronotus as giving off branched prolongations which 

 run upwards into the dorsal tentacles (rhinophores), and 

 other dorsal processes (cerata). Alder and Hancock 

 figure these hepatic caeca as conspicuous prolongations 

 from each side of the liver, while Bergh represents them 

 as being of large size in the terminal twigs of the cerata, 



* Trans. Biol. Soc, Vol. III., p. 225. 



tRay Society, "British Nudibranchiata, " Part II., fam. 3, PL II. 

 % " Bijdragen tot de Dierkunde," Natura artis magistra, Afl. XIII., 

 VIII., p. 25, Amsterdam, 1886. 



