l8o COLLINGE : ON GAEOTIS DOUVILLEI. 



look up the original description and figure, and see if it differed at 

 all from Pseudaustenia siamensk, Ckll.'^ As the Asiatic slug-like 

 molluscs are so very imperfectly understood, the subject is perhaps 

 worthy of a short note. 



De Morgan's description- is as follows : 



'^Animal. — Limaciforme allonge, d'un brun clair, orne de chaque 

 cote de deux bandes longitudinalis noires. 



Coquille. — Unguiliforme, aplatie, fragile, tres mince, transparente, 

 composee de deux demi-tours de spire, la partie inferieure manquant, 

 le dernier est tres grande, stries d'accroissement tres fines. 



Dimensions. Long. 9 mm.; larg. 5-5 mm." 



This is accompanied by a figure showing a Peltella-like slug. Both 

 the description and figure are poor, and were it not for the latter, it 

 would be very difficult to say to what genus this species belonged. 

 Although poor, the figure is sufficiently clear to show that the species 

 is closely allied to Peltdla, in fact, is in all probability rightly assigned 

 to the genus Gaeotis, I am therefore at a loss to understand Dr. 

 Pilsbry's statement " doubtless a Girasia." 



With reference to Pseudaustcmia siamejisin, Ckll., the type of which 

 is in the British Museum collection ; through the kindness of Mr. 

 Edgar A. Smith, I have recently had an opportunity of examining 

 this. There are two examples, and judging from the external appear- 

 ance I should say they both belong to the genus Parmariun and are 

 probably allied to P. jmjnllaris, Humb., if they are not young examples 

 of that species. It is, however, very difficult to separate these slug- 

 like molluscs on their external characters, and possibly P. siamensis 

 would on dissection prove to be a valid species. 



HELIX LAPICIDA, L, MONS. SINISTRORSUM, NOV.? 



By F. J. PARTRIDGE. 



Whilst staying at Lynton, North Devon, last summer I was fortunate 

 enough to find a full grown sinistral example of Helix lapirida, L. 

 There is a large colony of the type here inhabiting a low wall, together 

 with the varieties ecarinata and alhina. After a shower of rain they 

 come out, covering the wall and adjacent rocks in countless profusion ; 

 and although I have collected here for some years, and taken many 



1 Ann. and Mag. N. H., 1891, p. 107. 



2 Bull. Soc. Zool. France, 18S5, x, p. 388, pi. 8, Fig. 9. 



