106 Mr. T. D. A. Cockerell's Notes on Slugs. 



The characters of the mantle in depressa are peculiar, for 

 there are ridges exactly in the position of those in Mariaella. 

 One of these pale ridges passes from the respiratory orifice 

 backwards and the other from the front to the end of the 

 mantle on the left side. There is also a sulcus, suggesting 

 that of Amalia, visible as a curved line on the right side, its 

 convexity towards the respiratory orifice. 



Girasia affinis, sp. n. 



Length 42 millim. (in alcohol) ; middle portion of mantle 

 swollen ; body high, truncate posteriorly in contraction. Aper- 

 ture in mantle circular, only 3^ millim. in diameter. Colour 

 ochre, with grey mottling on mantle and body. Mantle 

 without ridges. Shell brown, shiny. 



Described from a specimen in the British Museum labelled 

 "Austenia peguensis, Theob., Pegu (Theobald)." Certainly, 

 from the label, this ought to be the genuine peguensis, and it 

 agrees in general appearance very well with Godwin- Austen's 

 figure of that species. But Godwin- Austen's figure is of a 

 slug in which the shell is mainly exposed, as in Austenia, 

 whereas G. affinis is a Girasia in the strictest sense. Theo- 

 bald's original description says peguensis is like Austenia 

 gigas in miniature, thus confirming Godwin-Austen's account, 

 besides which the latter also had his specimens from Theo- 

 bald. 



The typical form of peguensis is yellowish, without spots. 



It is thus plain that two very different species have been 

 labelled peguensis, namely the true species of that name, well 

 treated of by Godwin- Austen, and a species closely allied to 

 G. extranea, for which I propose the name of affinis. 



Ibycus sikkimensis (G.-Aust.) =jissidens } Heyn. 



27£ millim. long (in alcohol), mantle 17 millim. long ; 

 hind of mantle to end of tail 6^ millim., hind 6^ millim. of 

 mantle free, making the back altogether about 12| millim. 

 long. Mantle notched in front, anterior part of mantle 

 slightly granulose. Shell-aperture very large. Tail-gland 

 conspicuous. Tail slightly dark-reticulate on each side of 

 keel. General colour dull ochre, sides of neck dark grey, 

 anterior part of mantle slightly marbled with grey. Sole 

 unicolorous. Shell thin, chestnut-brown above, white (calca- 

 reous) below. 



Known by its marbled anterior part of mantle and the short 

 tail projecting beyond the mantle. 



