^ 



Morph 51. Plate Lxiii. 



Three Saints Bay is located on the coastline of Kodiak Is- 

 land, Alaska. In this population the strong development of 

 the spiral bands, modified by a corresponding expression of 

 the axial bands, gives the shells a rather striking sculptural 

 pattern. There is also a tendency to develop the secondary 

 spirals. The coloration follows the usual scheme, with the de- 

 velopment of finely banded forms. The spire form is variable^ 

 but tends towards the shortened type. 

 Specimens available, 15. 



Morph 52. Plate lxiii. 



Etoro Island is one of the Kurile chain, which extends north- 

 Ward from the main Japanese archipelago. 



The writer docs not have sufficient Japanese material to 

 express an opinion as to the relationship of the forms of Tbais 

 inhabiting the Japanese islands, and those occurring in the 

 Aleutians. Since however, the faunal elements of the two areas 

 are known to have much in common, they presumably were 

 even more closely related during some parts of the Pleistocene. 

 The only material from the Kuriles area available to the writer 

 which can be assigned to the lamellosa complex are four speci- 

 mens from Etoro Island, that seem to compare rather closely 

 in their form and sculptural pattern with local races from the 

 Aleutians. Since Etoro is located towards the southern end of 

 the Kuriles, it would seem that lamello s a ox c\o%t\y allied forms 

 must have a wide distribution among the islands, and along 

 the shores of Kamchatka. 



Morph. S3. Plate lxv. 



Sitkalidak Island is located off the southern coast of Kodiak 

 Island. The type of shell found in this population conforms to 

 a widespread pattern which reappears at many points in the 

 distribution of the species. The spire is short, and the sculp- 

 tural organisation is much reduced. 

 Specimens available, 6. 



