PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



Quite a number of the species are from considerable depths, ob- 

 tained during the explorations made by the United States Bureau of 

 Fisheries steamer Albatross; and another large contingent is due to 

 nij'^ own dredgings on the coast of Alaska and in Bering Sea during 

 1871 to 1880. 



I am also under great obligations to a host of collectors in our 

 Pacific States, who have with the greatest liberality intrusted me 

 with material for study which has added much to our knowledge of 

 the fauna and incidentally to the national collection. 



To Mrs. E. M. Decker much credit is due for the careful retouching 

 of the microphotographs of the new species from a study of the typi- 

 cal specimens under the compound microscope. And to Dr. Paul 

 Bartsch, curator of invertebrates, United States National Museum, I 

 am under many obligations for assistance in various ways during the 

 preparation of the figures. 



Some question having been raised as to the spelling of the family 

 name which I have retained as first proposed by Henry and Arthur 

 Adams in 1853, I submitted the question of " Turridse versus Turri- 

 tida3 " to two expert Latinists, who, after due consideration of all the 

 data, concluded that, while either was correct, the latter term under 

 the circumstances was to be preferred. 



DESCRIPTIONS OF THE SPECIES. 



Family TURRITIDAE. 

 Subfamily Tueritinae. 



TURRICULA LIBYA, new species. 



Plate 2, fig. 5. 



Shell solid, fusiform, the apex eroded, the surface white, covered 

 with a blackish olive periostracum and having about seven (decollate) 

 whorls; suture strongly appressed, obscure; anal fasciole wide, 

 smooth, concave, the sulcus wide and shallow, close to the suture; 

 spiral sculpture of a few feeble threads on the earlier whorls; axial 

 sculpture of (on the penultimate whorl nine or ten. on the last Avhorl 

 only three or four) short prominent riblets extending from the fas- 

 ciole protractively forward to the succeeding suture on the spire; on 

 the last whorl there is on the later part only an angle at the anterior 

 edge of the fasciole; base moderately convex, aperture narrow, with a 

 deep anal sulcus and a prominently arcuate, thin, sharp-edged outer 

 lip ; inner lip with a thin layer of white callus ; pillar thick and solid, 

 attenuated in front ; axis not pervious, canal short, wide, not recurved. 

 Height of (slightly decollate) shell, 40; of last whorl, 24; diameter, 

 13 mm. Cat. No. 96576, U.S.N.M. 



