216 GRIFFIN. 



lo sections (each cut at least 30/>« thick) in front of mouth. In 

 C. viarginatus they cease in the section in which the mouth 

 commences. 



IV. SUMMARY. 



Of the fourteen species treated in the foregoing ; nine appear 

 to be new and pecuhar to the Pacific coast *of North America ; 

 two (Emplectonema viridc and E. violacciiui) are already de- 

 scribed, although likewise peculiar to the west American coast ; 

 one [AnipJiiporiis angulattis) with three problematical forms are 

 boreal and are represented on the north Atlantic coast, and one 

 (^CcrcbraUilus marginattis) is cosmopolitan. Among the forms 

 peculiar to the west coast are a few that show remarkably close 

 resemblance to west European forms. Thus Carinella scxlineata 

 is the Pacific representative of C. siipcrba, while C. rubra resem- 

 bles C. niiniata. Emplectonema inride is very closely similar to 

 E. gracile. Lmcits striata resembles Micriira fasciolata} An- 

 other conspicuous fact is the complete absence of Atlantic 

 American species, outside of the strictly boreal forms such as 

 Ampliiportis angidatiis. No banded Carinellas occur on the 

 east coast^, no Carinoma has as yet been found. The east 

 coast Amphiporids and Lineids are either unrepresented on the 

 Pacific or replaced by different species. The noticeable scarcity 

 of Linens on the west coast is perhaps to be correlated with the 

 superabundance of different forms of Amphiporns, which appar- 

 ently replace them functionally. 



Zoological Laboratory of Columbla. University, 

 March, 1898. 



1 If it can ever be shown that Z. striata actually does possess the cirrus, and hence 

 is a micruran, this parallel will be further strengthened. 



2 Except the "large Canadian Carinella dredged in the Gulf of St. Lawrence by- 

 Mr. Whiteaves." Mcintosh '75. 



