39© TORREY 



pairs are tertiaries, placed between the primaries and secondaries. 

 One member of each pair is confined to the region of the tentacles and 

 is not more than two millimeters long. It always lies between a pri- 

 mary mesentery and the other member of the pair. The latter almost 

 equals the secondaries in size, and is plentifully supplied with longi- 

 tudinal muscles on both faces (fig. 20). 



Family CRIBRINID^ McMurrich. 



Bunodidce Gosse, i860. 

 Tealida R. Hert, 1882. 

 Bunodactidcc Verrill, 1899. 



Actiniin^e with a flat contractile base ; column usually with verrucas 

 or tubercles; margin often with complicated acrorhagi. Sphincter 

 muscle strong, circumscribed, endodermal ; perfect mesenteries usually 

 numerous ; acontia absent. 



In his latest paper, published in 1901, McMurrich has united with 

 Ehrenberg's genus Cribrina the synonymovis Bunodes Gosse, Biino- 

 dactis Verrill and Evactis Verrill ; and has made the necessary modi- 

 fication in the family name to accord with that of the type genus. In 

 accepting these changes I have not thought it necessary to repeat the 

 reasons supporting them, which McMurrich has already discussed at 

 length. 



Genus Cribrina Ehr. 



Cribrinidffi without true acrorhagi ; usually with numerous perfect 

 mesenteries which are in some cases in other than a hexamerous plan ; 

 sphincter strong ; ectodermal musculature of the disk and tentacles not 

 imbedded in the mesogloea ; column wall destitute of an epidermal 

 covering and provided with verrucie arranged more or less distinctly in 

 vertical rows; tentacles simple (McMurrich, 1901). 



CRIBRINA ARTEMISIA. 



Localities. — Puget Sound ; Sitka ; Yakvitat ; Popof Island ; Dutch 

 Harbor. Abundant. 



Genus Urticina. 

 This genus is distinguished from Cribrina only in the bedding of 

 the muscles of the tentacles and disk in the mesogloea, according to 

 McMurrich, who suggests that this character may prove to be inade- 

 quate ground for separation. The single specimen in the Harriman 

 collection affords no means for settling the question. 



