124 Transactions. — Zoology, 



generic name of Janella, Gray, 1850, was used, and arguments 

 given for doing so. As Janella, Grateloup, is identical with Niso, 

 Eisso, the name can stand, but I think, with Pilsbry, that it is 

 far better to reject any name which has been previously pro- 

 posed in a generic sense, whether the first usage is valid or 

 not. Mr. H. A. Pilsbry, in a letter to Mr. Charles Hedley, 

 kindly communicated to me, gives the following weighty 

 reasons : " We never know when a name supposed to be a 

 synonym is going to be revived for a section, sub-genus or 

 genus, on account of characters formerly overlooked ; and 

 when the name happens to be in a little-known group, un- 

 familiar to us — Diptera for example — who is to tell whether a 

 generic name is really a synonym or not?" I, therefore, use 

 now the name proposed by Gould. 



A. papillaris, Hutton. As this species has only been 

 figured by Simroth {A. verrucosus, Von Mart., Nova Acta, Bd. 

 54, pi. iv., fig. 11), and I had an opportunity of getting good 

 specimens near Christchurch, I now give correct drawings of 

 the animal, jaw and teeth of the radula (Plates XIV. and XV., 

 figs. 6-11). I compared carefully Simroth's description of the 

 animal and anatomy of A. verrucosus, Von Martens, 1889, 

 with typical specimens of A. papillatus, Hutton, and the 

 details of its anatomy published by Professor Hutton, and am 

 convinced that both are one and the same species. 



The var. nigricans and fasciata, Von Martens, I never 

 observed in adult specimens of A. papillatus. Young speci- 

 mens of this species I found always mixed of the typical form 

 and var. fasciatus, whilst in adult specimens the colour- 

 markings of the latter had fully disappeared, but they showed 

 somewhat different colours. Some were of a yellowish-brown, 

 but others were dark olive, the latter very likely correspond- 

 ing with the yax. fasciatus in the young. The variety nigricans 

 is rare. 



It seems to me that too much importance has been attri- 

 buted to the colour and colour-markings of Athoracophorus, 

 and this by scientists who have never seen the living animals, 

 but only specimens more or less badly preserved in alcohol, 

 which deteriorates the colour and form of the animals consider- 

 ably. I have collected hundreds of At}ioracophorus on both 

 Islands of this colony, and can testify to the great variability 

 of colour and colour-markings in the species. 



A. marmoreus, Hutton, is no doubt the same as A. viarmo- 

 ratus, Von Martens, described by Dr. Simroth. The descrip- 

 tion and figure of the animal given by Simroth corresponds 

 very well with Hutton's species, and in the main features of 

 the genital organs, according to the publications of both 

 scientists, they also seem to me to agree. I had no specimen 

 of A. marmoratus at my disposal, as was the case with 



