492 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxxiii. 



afforded hardly any Pyramidellids in the area under consideration, the 

 principal localities where collections have been made are: Sitka; the 

 region about the eastern end of Vancouver Island, including the Straits 

 of Fuca, the Gulf of Georgia, and Puget Sound; the vicinity of San 

 Francisco, California; and Monterey Bay. 



It is well to note that in the great archipelago extending fronn Fuca 

 Strait to Cross Sound there is a marked difference between the fauna 

 of the inner channels, which have their waters chilled by the dis- 

 charges from a multitude of glacial streams, and that of the outer 

 coast, which is washed by the comparatively warmer waters of the 

 Pacific Ocean. Many southern forms creep up along the outer coast 

 which are unknown from the inland bays and channels. 



From the paucity of information in regard to a considerable part of 

 the coast referred to, generalizations as to distribution at present can 

 at best be of a purely tentative character, and are therefore submitted 

 with due reserve. 



The recognition of new species and the distribution by collectors of 

 their discoveries under the new manuscript names has been going on 

 for several years, and it seems essential that the publication of the 

 data should be made with as little delay as possible, in order that these 

 names may be used in local lists and other places without leading to 

 confusion. 



The junior author has prepared the text of this paper, with the 

 exception of this introduction, and the part of the senior author has 

 been chiefly the collecting of material for study and an editorial 

 supervision of details, including the text herewith. The drawings of 

 the species were in part prepared by the late Dr. J. C. McConnell and, 

 since his death, chiefly by Miss Evelyn Mitchell. 



Genus TURBONILLA Risso.« 



Turhonilla Risso, Hist. Nat. Eur. Mer., IV, 1826, p. 224= Euturhonilla Semper, 

 Arch. Nat. Fr. Meek., 1861, pp. 354-361. 



Shell with sinistral apex, cylindro-conic, many whorled, generally 

 slender; with a single columellar fold which varies in strength and 

 frequently is not visible in the aperture. 



Type. — Turhonilla typlca Dall and Bartsch. 



«In the preparation of the present diagnoses the following terminology is used: 

 "Axial sculpture," the markings which extend from the summit of the whorls 

 toward the umbilicus. 

 The axial sculpture may be — 



"Vertical," when the markings are in general parallelism with the axis of 

 the shell. 



"Protractive," when the markings slant forward from the preceding suture. 

 "Retractive," when the markings slant backward from the suture. 

 "Spiral sculpture," the markings following the directions of the coils of the 

 whorls. 



