208 AETHUR WILLEY. 



Zool. Soc./ 1895). This important paper, and one by Bela 

 Haller ('' Beitrage zur Kenntniss der Morphologie von 

 Nautilus pompilius") in Semon's ' Forscliungsreisen in 

 Australien, &c./ 1895, have appeared since I left England. 

 In a former paper I dealt with the question of the genital 

 arteries of Nautilus. 



There is another matter concerning Mr. Kerr's work to 

 which I wish to refer. Mr. Kerr (op. cit.) says, "The true 

 coelom (viscero-pericardial sac, Owen) has received compara- 

 tively little attention from previous investigators, Grobben and 

 Lankester being the only authors who devote to it more than 

 a few passing words." 



Haller (op. cit.), referring to the orifices in the pallio- 

 visceral ligament leading from the pericardium into the vis- 

 ceral portion of the coelom, says, ^'doch so viel ich aus der 

 Literatur ersehe, wurden diese Oeffnungen zwischen den beiden 

 Colomtheilen weder ihrer Zahl noch ihrer Grosse und Lage 

 nach, beschrieben." 



What I wish to point out is that both these authors have 

 evidently overlooked Huxley's brief but pregnant memoir 

 '' On some Points in the Anatomy of Nautilus pompilius" 

 ('Journ. Linn. Soc.,' "Zool.," vol. iii,1859,pp. 36— 44),inwhich 

 the delimitations of the coelom and the position and features 

 of the three openings leading from the pericardium into the 

 visceral portion of the ccelom are described with perfect 

 accuracy and with marvellous clearness. It was not necessary 

 for Huxley to have illustrated his article, so lucid is his 

 account, and as a matter of fact the figures he does give do 

 not help much. But I might simply transcribe Huxley's 

 description as an explanation of the figure (PI. 11, fig. 2) which 

 I have drawn from a dissection showing the three openings in 

 question. I have rarely read an account of somewhat compli- 

 cated anatomical relations so perfectly and immediately intel- 

 ligible as the one above referred to by Huxley, and it is 

 undesirable that such work should be ignored. 



