62 



Morph 33. Plate xlviii. ^{! 



Vashon Island is located in King County, Washington. The 

 material representing this morph was collected from the piling 

 of a dock at Paradise Cove on the western side of the island. 

 As is commonly seen in such situations, the piles are covered 

 by an extensive growth of marine organisms, which appear to 

 supply the snails with an abundance of food, thus accelerating 

 their growth and causing them to attain an unusually large 

 size, while the imbrications are correspondingly exaggerated. 

 Specimens available, 100. 



Morph 34. Plate xlix. 



Rocky Bay is a small arm of Case Inlet, Mason County, 

 Washington. In this population the shells are rather heavily 

 imbricated, and present forms which resemble some of those 

 found in the San Juan Islands and elsewhere. They also sug- 

 gest a transition to the even more "frilled" variants occurring 

 in Puget Sound, as seen in morph 35 derived from a neighbor- 

 ing area, as well as to the northward in Kitsap County . Variants 

 are also present leading to forms in which the sculpture is much 

 reduced. In this morph color is almost completely absent or 

 feebly expressed. In the entire collectiori only a single specimen 

 was found to be heavily pigmented. 

 Specimens available, 100. 

 Morph 35. Plate L. 



The material representing this morph was derived from an 

 oyster bed located in the vicinity of the town of Ally n on Case 

 Inlet, Puget Sound. 



In this population we find an example of the most extreme 

 type of the imbricated variants. Closely related populations 

 occur throughout Port Orchard, Sinclair Inlet, Rich Passage 

 and the Manchester area in Puget Sound. Coloration is lack- 

 ing or feebly expressed in the material at hand. 

 Specimens available, 25. 

 Morph 36. Plate Ll. 



Silverdale is located at the northern end of Dye Inlet, io 

 Kitsap County, Washington. 



