boetxger: on sulcobasis concisa. 185 



now in the Bremen Museum, and kindly sent me for examination by 

 Professor Dr. H. H. Schauinsland, exhibits much shallower furrows 

 than the type figured by Ferussac. The depth of furrows is therefore 

 by no means to be considered as a character of predominant value. 

 It is possible that on certain islands S. concisa concisa shows a tendency 

 to produce furrows in a greater degree than usual. This presumption 

 could only be proved by a much larger amount of material, which 

 unhappily is still wanting. Certainly there are specimens of the true 

 concisa concisa, the furrows of which are by no means stronger than 

 in the other sub-species. The type locality of concisa is the little 

 island of Rawak, near Waigiou (Freycinet) ; from the island of 

 Waigiou it was brought home by Wallace. Besides these there have 

 been mentioned specimens of concisa from Cuming's collection, which 

 were said to come from the Aru Islands and from New Guinea. 

 All quotations in literature refer to these four finds. The shells from 

 New Guinea, which Cuming placed in concisa concisa, are in fact 

 very distinct from this sub-sj)ecies. Gude separated it in 1906 as 

 a nevv species, which he named ciimingi. Thus all statements of 

 habitat indicating S. concisa concisa, Fer., fi'om New Guinea are 

 based on Cuming's shells, and are to be referred to S. concisa cumingi 

 (Gude). The statement which Gude made in 1906 of S. concisa concisa 

 (Fer.) coming from New Guinea (after having separated S. cumingi 

 from it) is also to be referred to 8. concisa c^imingi, for Glide's 

 statement was only based on the quotations of literature of concisa 

 from New Guinea, mentioned above. The specimens from Cuming's 

 collection supposed to come from the Aru Islands and determined as 

 concisa certainly belong to that sub-species.^ One of these shells is 

 figured in Keeve's monograph of Helix in 1852. Another shell was 

 given by Cuming to von dem Busch. It is the specimen mentioned 

 above, which was described by Pfeiffer in 1848, and which is now in 

 the Bremen Museum. Its furrows are not so well developed as in the 

 specimen figured by Reeve. PI. v, figs. 4-6, in my paper represent 

 this shell. The suj)posed locality is no doubt erroneous, for no 

 specimen of S. concisa concisa (Fer.) exists on these islands, but it is 

 replaced by S. concisa cumingi (Gude), as my treatment of cumingi 

 will show. 



This sub-species is distributed on Waigiou and adjacent islands, 

 and it seems probable that it will also be found on some part of the 

 neighbouring coast of New Guinea. Accurate localities of this 

 sub-species are the islands of Rawak (Frevcinet) and Waigiou 

 (Wallace). 



3. Sulcobasis cokcisa cumingi (Gude). PI. V, Figs. 7-12. 



1865. Semicornu riibrum, Alb. partim. Wallace, Proc. Zool. Soc, 



p. 410. Aru Islands (Wallace). 

 1868. Helix rubra. Alb. partim. Pfeitfer, Mon. helic. viv., vol. v, 



p. 374. Aru Islands (Wallace). 



^ Messrs. G. K. Gude and G. C. Robson were kind enough to procure me 

 photographs of one of Cuming's specimens of true concisa ; they are 

 reproduced on PI. V, Figs. 1-3. 



VOL. XI.— SEPTEMBER, 1914. 13 



