collinge: non-operculate land and freshwater molluscs. 91 



bluish ; underside (perinotuni ?) dirty white ; foot-sole yellowish-white; 

 keel well developed and fairly prominent, white with numerous 

 minute brown dots. Length of notum (in alcohol) 30, breadth 7, 

 height 7 millim. Breadth of foot-sole 4 millim. Female generative 

 orifice about 6 millim. from the male generative orifice. * 



Hah. — Ban Kong Rah, District of Gaboing. 



This interesting species will probably prove to be at least sub- 

 generically distinct from Aiopo^ when the internal structure is known. 

 It is named in honour of Mr F. F. Laidlaw, a member of the Skeat 

 Expedition, and by whom it was collected. 



Bibliography. 



1. Babor, J. F. — Mittheilungen fiber Nacktschnecken in der 



Sammlung des k. k. naturhist. Hofmuseums. II. Erste 

 vorlaufige Mittheilung zu einer Monographic der Gattung 

 Atopos Simroth. Ann. d. k.k. Naturhist. Hofmus. Wien, 

 1900, Bd. XV, pp. 100-102. 



2. Cockerell, T. D. A. — A Check-list of the Slugs. The Conchologist, 



1893, vol. ii, pp. 168-176 and 185-232. 



3. Collinge, Walter E. — On the Anatomy of A2jera hurnupi, E. A. 



Smith. Ann. Mag. N. H., 1897 (s. 6.), vol. xx, pp. 221- 

 225, pk V. 



4. do. Report on the Slugs. A. Willey's Zoological Results, 



1899 [1900], pp. 429-438, pis. xl.-xli. 



5. do. On a collection of Slugs from South Africa, with descrip- 



tions of some New Species. Ann. Sth, Afr. Mus., 1900, 

 vol. ii, pp 1-8, pis. I, 2. 



6. do. Note on ihQ AnSitovLiy o{ AriqjluJwmicA ijcdaceiis, M.o\x?,?,. 



Journ. Malac, 1901, vol. viii, pp. 50-52, pi. iv. 



7. do. Note on the Anatomy of Apera hurmqji, E. A. Smith. 



Ibid., pp. 71, 72, fig. 



8. do. On the Anatomy of the Vitnnairi-adiamoiViexiiex.lhid., 



pp. 63-70, pis. V, vi. 



9. Crosse, H. — Mollusques nouveaux de Perak. Journ. de Conchyl., 



1879, vol. xxvii, pp. 198-208. 



10. do. Faune malacologique de Perak. Ibid., pp. 336-340. 



1 1. Fulton, Hugh. — A List of the species of Land Mollusca, collected 



by Mr. W. Doherty in the Malay Archipelago ; with 

 descriptions of some supposed new Species and Varieties. 

 Proc. Malac. Soc. Lond., 1899, vol. iii, pp 212- 219, pi. xi. 



12. Godwin-Austen, H. H. — Mollusca of India, 1882-1888, vol. 1. 



