172 



BUSH 



Grove, California, by Dr. Coe, are added, and also some facts 

 regarding the few known species obtained farther south. 



The S fir or bis group, recently found of so much interest 

 (p. 252), has been thoroughly studied as a whole ; the results are 

 here given in as condensed a form as seems possible without 

 interfering with a clear understanding of the many species. 



The three following lists, although not properly a part of the 

 introduction, are placed here for convenience. 



SPECIES PREVIOUSLY RECORDED FROM THE PACIFIC 

 ARRANGED WITH REFERENCE TO THEIR 

 GEOGRAPHICAL DISTRIBUTION. 



North Pacific, 



Bering Sea : 



1. Psetidofotamilla reni/brmis (Leuckart, 1849, Sahella^ 



figures, + Malmgren 1867, as Potamilla^ figures, + 

 Marenzeller 1890). Also North Atlantic. 



2. Euchone analis (Kroyer) Malmgren 1865, figures, 



+ Marenzeller 1890. Also North Atlantic. 



Puget Sound Region : 



3. vancouveri (Kinberg 1866, as Sahelld), See 



p. 197. 



4. Eudistylia -polymorfha (Johnson 1901, as Bisfira^ 



figures). South to Pacific Grove, California. 



5. Megachone ati^rantiaca ]oh.n^on 1901, figures. 



6. Myxicola facifica ]ohnson 1901, figures. 



7. Serfula columbiana Johnson 1901, figures. South to 



San Francisco, California. 



8. Crucigera zygofhora (Johnson 1901, as Serfula^ fig- 



ures). 



Central America to United States of Colombia: 



9. Hydroides crucigera (Morch 1863, as Eucarfhus^ fig- 



ures). Central America, 14 fms. 

 10. Pomatostegus kroyeri Morch 1863, figures. Central 

 America. 



1 When the generic name has been changed by subsequent writers, the original 

 one is also given after the name of the author. 



2 An interrogation mark in the place of the generic name indicates that the 

 description of the species is not sufficiently clear to determine its position. 



