NO. 2 



OLGA hartman: submarine canyons 



103 



was usually considerably less than those taken by the same grab without 

 a camera, suggesting that the bite was not as deep. 



The following canyons have photographic records. 



1. Mugu canyon, Sta. 7521, in 850 meters, mud. The photograph 

 (Fig. 20) shows numerous small black specks and fewer white ones, 

 uniformly dispersed over the bottom. The Analyses showed the presence 

 of many dead tube remains of Phyllochaetoptcrus litnicolus and white 

 tubes of Protis pacifica. There were no living animals. This bottom is 

 characteristic of the subsill parts of San Pedro and Santa Monica 

 basins. The bottom is nearly or altogether dead. The cloud of silt was 

 stirred up by the mechanism of the camera. 



Fig. 20. Mugu canyon, Station 7521, in 850 meters. The cloud of silt 

 was stirred up by the camera mechanism. The small irregu- 

 larities are projecting dead tubes of annelids, and the white 

 fragments possibly Cyclopecten. The base line represents 

 about 12 cm. 



