337 



Sphaernnia is often found in rrt'N'ices or other sheltering nooks outside of its 

 Inirrows, and is e\identl\' something of a forager. Its stomach contents have iieen 

 found to i)e made up of thi' minute \egetalile and otiier growths whirii co\-er the sur- 

 face of the piling. We have foiuid fragments of wood in the intestine, hut not in 

 quantity sufficient to indicate that the organism feeds habitually on this substance, 

 or depends upon it in an>- ilegree for its nourishment. 



Genus CiiKi-tKA 



The members of this amphipod genus differ markedly trom the isopod genera 

 Limnoria and Sphaeroma. The body is more attenuated, somewhat lateralK' instead 

 of dorso-\entralh' compressed, and e(|uipped with much more prominent appendages 

 than the isopod borers possess. 



Two species have i)een described, of which cme occurs in Atlantic waters and the 

 other in the Pacific Islands. Neither has as yet appeared on the Pacific Coast of North 

 America. Both are apparenth' adapted primarily to tropical or sub-tropical waters, 

 and are not of common occurrence in northern harbors, although ('. terebrans has been 

 report(.'d along the coast of Kurojie from Norway to the Black Sea. 



Fig. 141. Chtiuru ///i/f/nf from Tut uila. (1) male. I2j female. Both X 17. 



