(^ 



This population is obviously very similar to the forms fig- 

 ured on Plate Lin, derived from another area on the same 

 Alaskan island. It will be noted however, that the imbrication 

 is less pronounced, while delicate color banding is in evidence 

 This is an illustration of the delicate shading commonly found 

 in the differences between closely allied local races. 

 Specimens available, 12. 



Morph 48. Plate lxi, 



Kagamil Island is one of a group known as the Islands of 

 the Four Mountains, located near the center of the Aleutian 

 Chain. The scanty material available indicates that through- 

 out the Aleutian Islands a type prevails in which a short spire 

 and reduced banding is in evidence, resembling quite closoly 

 some of the local races found to the south of Cape Flattery. 

 Beachworn shells from Unalaska and from Adak Island to the 

 westward, tend to confirm this impression. 

 Specimens available, 6. 



Morph 49. Plate Lxi. 



Afognak Island lies to the northeast of Kodiak. The single 

 pair of shells available for study indicate a type of structure 

 comparable to that premised for the Aleutians to the west- 

 ward, or to populations occurring in Puget Sound. 



Morph 50. Plate lxii. 



This population was collected from a reef near the village 

 ofYakutat, in Yakutat Bay, Alaska. The striking difference 

 between this local race and that shown on Plat lx, derived 

 from an adjacent area, illustrates the familiar fact that very 

 dissimilar races may inhabit closely adjoining areas, seemingly 

 not differing greatly in tneir ecological conditions. 



In the present morph it will be noted, there is exhibited a 

 range in size, spire form, sculpture and coloration, indicating 

 a mixture of several ancestral stocks. 

 Specimens available^ 25. 



