354 



PROCEEDINGS OP THE NATIONAL MUSEUM. 



VOL. 63. 



Genus LAMBERTIA Souverbie. 



Lamberda Souvebbib, Journ. de Conch., 18G9, p. 420. Type Lambertia mon- 

 trouzieri Souverbie. 

 Melanellids with mucronate apex, pupiform outline, and witli the 

 inner lip appressed to the attenuated base of the preceding whorl. 



LAMBERTIA COOKEANA, new species. 



Pkte 49, fig. 1. 



Shell ovate, with a narrow cylindric mucro consisting of two turns, 

 following these two turns, the whorls become decidedly gibboso and 

 appressed at the summit. Surface of the whorls marked by exceed- 

 ingly retractive lines of growth and very fine microscopic" spiral stria- 

 tions. Periphery of the last whorl well rounded. Base moderately 

 long, stout, curved, and revolute; parietal wall covered by a thick 

 callus. 



The type (Cat. No. 150869, U.S.N.M.) has four whorls in addition 

 to the mucro, and measures — length, 3.7 mm.; diameter, 2 mm. It 

 and 10 specimens were collected by Miss Cooke at San Hipoli to Point, 

 Lower California. 



The following additional specimens have been examined: 



EXPLANATION OF PLATES. 



Plate 34. 



Fia. 1. Melanella micans Carpenter, Fossil, Upper San Pedro Series, length 10.6 mm. 



2. Melanella micans Carpenter, Fossil, Lower San Pedro Series, length 10.2 mm, 



3. Melanella micans Carpenter, Fossil, Upper San Pedro Series, length 11.2 mm. 



4. Melanella micans Carpenter, Fossil, Upper San Pedro Series, length 12.7 mm. 



5. Melanella micans Carpenter, a typical specimen, length 12.7 mm. 



6. Melanella micans Carpenter, type, length 9.4 mm. 



Plate 35. 



Fig. 1. Melanella ochsneri Bartsch, topotype, length 8.3 mm. 



2. Melanella rutila Carpenter, type, length 6.8 mm. 



3. Melanella rutila Carpenter, Fossil, Lower San Pedro Series, length 5.8 mm 



4. Melanella solitaria C. B. Adams, type, length 4.7 mm. 



5. Melanella dalli Bartsch, type, length 20 mm. 



6. Melanella rutila Carpenter, Fossil, Upper San Pedro Series, length 6.2 mm. 



7. Melanella micans horealis Bartsch, type, length 11.3 mm. 



Plate 36. 



FiQ. 1. Melanella panamensis Bartsch, type, length 2.8 mm. 



2. Melanella vionicensis Bartsch, type, length 8 mm. 



3. Melanella necropolitana Bartsch, type, length 7.5 mm. 



4. Melanella linearis Carpenter, length 2.6 mm. 



5. Melanella oldroydi Bartsch, Fossil, Upper San Pedro Series, length 7.8 mm» 



6. Melanella oldroydi Bartsch, type, length 9.2 mm. 



7. Melanella oldroydi Bartsch, Fossil, Lower San Pedro Series, length 8.1 mim. 



