Parti. PHILIPPINE LAND SHELLS BARTSCH. 7 



(pp. 130-133) Amphiclromus maculiferus Sowerby with variety 

 obscurus Fulton; subspecies multicolor Mollendorff; subspecies 

 gracilior Fulton; variety strigata Mollendorff; subspecies inflatus 

 Fulton, Amphiclromus chloris Reeve (pp. 143-144) with variety 

 pallidulus Pilsbry from Zamboanga and varieties purissimus Pilsbry 

 and rosa Pilsbry from Basilan Island. 



A. roeseleri Mollendorff is listed on pages 144-145 — A. entobaptus 

 Dohrn on pages 145-147. A. lindstedti Pfeiffer is referred to as 

 coming from Balabac according to Fulton (pp. 228-229). As we 

 have said before, the Balabac specimens cited probably refer to 

 some of the forms of A. quadrasi Hidalgo. A. lindstedti Pfeiffer 

 comes from Malacca. 



Amphidromns quadrasi Hidalgo is treated (pp. 229-230) and 

 solldus, versicolor, dubius, and everetti of Fulton are recognized. 



GEOGRAPHIC DISTRIBUTION. 



The genus Amphidromus presents some A'ery fascinating zoo- 

 geographic problems in the Philippine Islands, and. when fully 

 studied, will undoubtedly throw considerable light on the derivation 

 and dispersal of the Philippine land shells. At present the available 

 information is fragmentary, and more material with specific locality 

 notes is badly needed. 



There are several distinct groups which show a northward migra- 

 tion from Borneo into the Philippine Archipelago. One of these 

 is the group of AmpMdromus quadrasi, which has undoubtedly come 

 from some Bornean stock and is extending its range northward into 

 Palawan. At the present time it is distributed over Balabac and 

 the adjacent islands. 



Then there is the group of Amphidromus entobaptus, which ex- 

 tends over Palawan and the Calamianes group, apparently splitting 

 up into races in the islands of the latter group, and a generic label 

 " Calamianes," which was applied by the older collectors to material 

 from this group, is absolutely insufficient to enable one to understand 

 the complex or the conditions and causes for the variations presented 

 by a mixture of forms assembled from the various places within the 

 group. This is well shown by the specimens which we have had 

 for examination which have enabled us to recognize a number of 

 races, each practically confined to a separate island. The northern- 

 most extension of the yellow Amphidromus is found in Mindoro in 

 the large inflated species now described as A. mindoroensis. 



No Am,phidromus has been reported from Luzon (the term 

 " Manila " seen at times on old labels simply means that they were 

 purchased in the Manila markets and not that they occur at or about 

 Manila), nor do any Amphidromi occur on any of the smaller 



