65 



Morph 43. Plate lviii. 



Johns Island lies to the southeast of Stuart Island in the 

 San Juan group. The specimens illustrated were brought up 

 in a dredgehaul from a submerged reef in this area. We have 

 here an additional example of the increased growth of the 

 snails inhabiting such sites, paralleling the "giant" forms of 

 the Atlantic species found in like situations. 

 Specimens available, 25. 



Morph 44. Plate lix. 



The village of Neah Bay stands at the entrance to the Strait 

 of Juan de Fuca. The specimens illustrated were derived from 

 the piling of the dock at the village. The type presented by 

 this population reappears with various modifications through- 

 out the entire range of the species. The somewhat greater than 

 average size is related to the favorable nutritive conditions 

 commonly found in such situations. 

 Specimens available, 10. 



Morph 45. Plate lix. 



Sitkalidak Island lies off the southern coast of Kodiak Is- 

 land. This population exhibits a range in spire form and sculp- 

 ture bridging the gap between the long and short spired forms. 

 Specimens available, 15. 



Morph 46. Plate lx. 



The materia! representing this population was collected 

 from an area on the shore in the vicinity of Yakutat Village, 

 on Yakutat Bay, Alaska. In this population there is a reduc- 

 tion in the sculptural pattern, the spire form is more obtuse, 

 and the coloration is obscurely indicated; suggesting a com- 

 bination of characters resembling some of the morphs found 

 in the San Juan Islands and elsewhere. 

 Specimens available, 12. 



Morph 47. Plate lx. 



Craig is located on the western coast of Prince of Wales Is- 

 land, Alaska. 



