296 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.53. 



being at right angles to that of the succeeding turns, in the first of 

 which the nuclear whorls are frequently quite strongly embedded. 

 In the Melanellidae, on the other hand, the early whorls are dextral 

 and never tilted or immersed. By far the greater number of the 

 Pyramidellid moUusks are highly sculptured, a feature almost absent 

 in the Melanellidae, where varices mark the strongest axial sculp- 

 tural element and the spiral sculpture scarcely exceeds that of finely 

 incised lines. 



The firet Melanellid to be reported from the west coast of America 

 was Stilifer astericolus Broderip, a moUusk collected on starfish at 

 Hood Island of the Galapagos group by Hugh Cuming. This is not 

 only described here by Broderip ' as a new species, but constitutes 

 the type of the genus Stilifer there characterized. 



Two yeai-s after this appeared G. B. Sowerby's paper on the 

 " Eulimas," collected by Hugh Cuming and this describes seven 

 new West American forms ^. These are: 



Eulima splendidida Sowerby, from Sancta Elena. 



Evlima inierrupta SoY>^erby, from the Gulf of Nocoiyo. 



Evlima imhricata Sowerby, from Sancta Elena. 



Eulima Jiastata Sowerby, from Sancta Elena. 



Eulima pusilla Sowerby, from Sancta Elena. 



Eulima varians Sowerby, from Xipixapi. 



Eulima acuta Sowerby, from Montiji Bay. 



Eight years later (1852), C. B. Adams published his catalogue of 

 shells collected at Panama, in which he described ' Eulima iota, 

 Eulima recta, Eulima solitaria. 



Two years after this Arthur Adams's Monographs of the Genera 

 Eulima, Niso and Leiostraca were published.* Here we find tho 

 previously described species redescribed and figured, and some of 

 them referred to other genera than those under which they were 

 originally described : 



Eulima liastata Sowerby, page 794, plate 169, figures 7, 8. 



Eulima pusilla Sowerby, page 794, plate 169, figures 9, 10, 21. 



Eulima iota C. B. Adams, page 798, plate 169, figure 19. 



Niso intcrrupta Sowerby, page 801, plate 170, figure 9. 



Niso spleifididula Sowerby, page 801, plate 170, figure 8. 



Niso imhricata Sowerby, page 802, plate 170, figure 10. 



Leiostraca acuta Sowerby, page 803, plate 170, figure 11. 



Leiostraca, varians Sowerby, page 804, plate 170, figures 23, 24. 



Leiostraca recta C. B. Adams, page 804, plate 170, figure 25. 



The next to make contributions to the west coast members of this 

 family was Philip P. Carpenter, who devotes pages 438-442 of his 



> Proc. Zool. Soc. London, 1832, p. CO. 



* Idem, 1834, pp. 6-8. 



8 Ann. Lye. Nat. Hist.. N. Y.. 1852, pp. 198-199. 



* Sowerby's Thes. Conch., 1834. 



