172 BUSH 



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

 regarding the few known species obtained farther south. 



The Spirorbis 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. Pseudopotamilla reniformis (Leuckart, 1849, as Sabella? 



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

 Marenzeller 1890). Also North Atlantic. 



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



4- Marenzeller 1890. Also North Atlantic. 



Puget Sound Region: 



3- - ?2 vancouveri (Kinberg 1866, as Sabella). See 



p. 197. 



4. Eudistylia polymorpha (Johnson 1901, as Bispira, 



figures). South to Pacific Grove, California. 



5. Mcgachone aurantiaca Johnson 1901, figures. 



6. Myxicola pacifica Johnson 1901, figures. 



7. Serpula columbiana Johnson 1901, figures. South to 



San Francisco, California. 



8. Crucigera zygophora (Johnson 1901, as Serpula, fig- 



ures). 



Central America to United States of Colombia : 



9. Hydroides crtictgera (Morch 1863, as Eucarphus, 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. 



* 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. 



