64 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



bryozoans named with depths and dates, data for these groups may 

 not be representative. 



Station i was in the gravel zone. Special techniques employed 

 here might yield more animals, especially small ones such as amphi- 

 pods, which were frequently observed near shore crawling in and out 

 of the gravel. The presence in this zone of an animal such as the 

 dorid Aldisa zetlandica ( ?) is amazing. Since it was present as soon 

 as the ice went out it could not have migrated from deeper water, and 

 the only explanation for its existence here is that it burrows into 

 the gravel. But it seems incredible that a single specimen could sur- 

 vive the grinding to which the gravel is subjected when the ice breaks 

 up and piles up in ridges, as it does in the early winter. 



Representative animals from a dredge haul from this station are 

 as follows : Hydroids — Corymorpha sp., 2. Nemerteans — Amphi- 

 porus lactifloreus, i; A. macracanthus, 1. Bryozoans — Alcyonidium 

 disciforme, 10. Polychaetes — Phyllodoce groenlandica, 14. Amphi- 

 pods — Atylus carmatus, 4. Gastropods — Aldisa zetlandica, 1 ; Cylichna 

 occulta, I. 



Station la was in the mud zone where it is difficult to obtain a 

 true sampling because it is impossible to dredge to the depth at which 

 most of the animals live. The following were among those obtained : 

 Bryozoans — Alcyonidium disciforme, 16. Holothurians — Myriotro- 

 chus rinki, 9. Polychaetes — Pectinaria granulata, 8. 



Station 2 was in the typical mud zone and the most important 

 animal in the hauls was Hydractinia sp. on snail shells. 



Station 3 was also in the typical mud zone. Nemerteans — Amphi- 

 porus paciflcus, i; Linens ruber, i; Micrura alaskensis, 1. Bryo- 

 zoans — Alcyonidium disciforme, 13. Holothurians — Psoitis fabricii, 

 few (probably washed in from the rubble zone) ; Myriotrochus 

 rinki, 15. 



Stations 4, 6, 12, 13, and 60 were at Eluitkak Pass, where the 

 depth is given on U. S. Coast and Geodetic Survey maps as 40 feet, 

 but a sounding made in the summer of 1949 gave 46 feet. No doubt 

 the depth varies somewhat, for a strong current sweeps through the 

 Pass. The amount of mud found in a dredge haul is somewhat vari- 

 able. At this depth one should expect to encounter a mud bottom, for 

 in the open ocean no rubble bottom is found in less than 100 feet of 

 water, but the current here keeps the mud washed away and the sur- 

 face of the stones exposed so that animals may grow on them. 



On the whole the fauna of Eluitkak Pass is like that of the rubble 

 bottom in the open ocean at depths of no feet or more. One striking 

 difiference is the total absence of echinoderms, owing undoubtedly to 



