298 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



discussed by Doctor Dall in Fur Seals and Fur Seal Islands of the 

 North Pacific, part 3, 1899, page 539, and in the Proceedings of the 

 United States National Museum, volume 37, 1909, pages 185 to 191. 



I would however, on the basis of the present study, suggest a slight 

 rearrangement of the subdivisions (faunal areas) which the larger 

 provinces have been held to contain in the past, namely, I would 

 retain five primaiy provinces, using for them the terms Arctic, North 

 Temperate, Tropic, South Temperate, and Antarctic. 



In the first, the Arctic, I would include the Arctic in the restricted 

 sense and the Aleutic of the present paper. These two correspond 

 to the Arctic and Boreal of the east Atlantic. In the Arctic 

 in the restricted sense there are 4 species belonging 2 each to the 

 subgenera Evalea and Amaura. In the Aleutic these two sub- 

 genera are found containing 15 out of the 19 species peculiar to it, 

 the remainder comprising a single species of Menestlio, 1 of Striotur- 

 honiUa, and 2 of Pyrgolampros, the last named subgenus being 

 practically confmed to the North Temperate province which harbors 

 23 out of the 26 species. 



The North Temperate should embrace the Oregonic and Cal- 

 iFORNic faunal areas which correspond to the Celtic and Lusitan- 

 lAN of the east Atlantic. In this province there is as a leading 

 feature the subgenus Pyrgolampros, only 1 species of which is 

 known in the Tropic province wliile 2 only are found in the 

 Arctic. The subgenus Mormula is also quite characteristic; 2 out 

 of 14 are found in the Tropic, and none are known from the Arctic 

 province. The subgenus Ivara is entirely confined to this province, 

 and Careliopsis and Salassiella are known -from the Californic 

 faunal area only. Evalea finds its greatest development here, being 

 represented by 49 of the 64 species known from the entire west coast. 



The Tropic province should embrace the Mazatlanic, the Pan- 

 AMic and Galapaganic, corresponding to the West African of the 

 east Atlantic. In tliis we find the following subgenera pecuHar 

 to the region, Pyramidella, Pharcidella, Asmunda, Lysacme, Salassia, 

 Pyrgulina, Haldra, and Odostomia. The rather large subgenus 

 Amaura is entirely unrepresented and Pyrgolampros has but a single 

 representative. 



From the South Temperate province, corresponding to the South 

 African of the east Atlantic, we have but 4 representatives, 3 of 

 which belong to the subgenus Pyrgiscus which ranges over the 

 North Temperate and also the Tropic, and one of the subgenus 

 Menestho, which has an equally extensive distribution. 



The Antarctic Pyramidellid fauna is unknown at present, but 

 judging from the currents, one notes that 2 faunal areas are 

 indicated in the Antarctic province; one, the Magellanic, corre- 

 sponding to the Aleutic of the northern hemisphere covering the 



