Among the pelagic larvae of bottom living animals, none 

 were so conspicuous as certain echinoderm larvae. Echino- 

 plutei were taken from station N5 northward to station N12 

 (fig. 58), the greatest numbers occurring at station N6 off 

 Cape Romanzof. It is interesting to note that station N6 is 

 in the area in which the water temperature was found to 

 be uniformly warm, 43 to 40 degrees F from surface to 

 bottom, (see figs. 17, 18, 19, and 23). These larvae were 

 perhaps the result of recent spawning in or near the area, 

 since the larvae were mostly in the 4-arm stage, which at 

 13 to 14 degrees C is reached about 46 hours after the eggs 

 are spawned, according to studies in Puget Sound. Other 

 successful hauls were made in water with greater temperature 

 stratification, in the band of relatively warm surface water ex- 

 tending out from the Alaskan Coast. No echinoplutei were taken 

 immediately north of Bering Strait (stations N10, N27, and Nil) 

 where the surface isotherms are bent towards the east by 

 cold water flowing along the western portion of the strait; 



Figure 58. Locality records of 

 Echinopluteus, giving the number 

 of individuals per haul, adjusted 

 to 60-meter vertical hauls (size 

 of shaded area proportional to 

 number of individuals caught at 

 that point). 



