142 THE NAUTILUS. 



these snails has hitherto hindered a knowledge of their anat- 

 omy, the accounts given by Lehrnann being very incorrect. 

 Acanthinvla aculeata proves to have genitalia comparable to 

 those organs in PitpillicUr. A. lameUata Jeffr. is without male 

 end organs (vasdeferens and penis). This condition Mr. 

 Steenberg is disposed to regard as secondary'. VaUonia cos- 

 tata has pallia! and reprotluctive organs of the group Orthu- 

 rethra. Mr. Steenberg has rendered an important service in 

 working out the characters of these difficult snails. 



The Philippine Lai«jd Shells op the Genus Amphidro- 

 MUS. By Paul Bartsch. Bull. U. S. Nat. Mus., no. 100, pp. 

 47; 22 plates. Having at hand a large amount of authen- 

 tically localized material, Dr. Bartsch lias been able to trace 

 relationships and define species and subspecies in this diffi- 

 cult group of beautiful tree snails with precision and detail 

 not reached hitherto by the authoi*s who have treated of them. 

 The Philippine series is traced to two routes of migration 

 from Borneo, one through Palawan to the Calamianes, the 

 other by way of the Jolo group to jMindanao, etc. On Min- 

 danao the relation of topography to the distribution of species 

 and races suggests to the author ' ' that this island is composed 

 of a series of smaller islands which have been fused into the 

 large territory by a comparatively moderate raising of that 

 part of the ocean floor. ' ' Numerous new forms are described, 

 and all are figured. — H. A. P. 



Some New Species op Amastra. By C. ^Montague Cooke. 

 Occasional Papers Bernice Pauahi Bishop Museum, vol. 3, no. 

 3, pp. 29, 3 plates. While this paper is especially valuable 

 on account of the new forms made known from Kauai (6) 

 and from Hawaii (9), there are also interesting species from 

 Oahu, Molokai and Maui. Two sinistral species (one Pleis- 

 tocene) from Maui, and one Pleistocene species from Oahu are 

 added to the short list of sinistral Amastras. A. hitchcocki is 

 a very large new Amastra from Molokai. Many of the new 

 forms are from Pleistocene deposits. Excellent photographic 

 figures are given. — H. A. P. 



