362 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 41. 



appressed to the base; parietal wall covered with a thick callus, 

 which renders the peritreme complete. 



The specimen described and figured (Cat. No. 16206, U.S.N.M.) 

 comes from Cape San Lucas, Lower California. It has 2^ post-nuclear 

 whorls, and measures: Length 1.2 mm., diameter 0.7 mm. The tyi'e 

 and another specimen are on Tablet 1711, Liverpool Collection, 

 British Museum. They wece taken off Spondylus, Mazatlan. 



EXPLANATION OF PLATES. 

 Plate 29. 



Fig. 1. Alvania castanella Dall; Type; length 2.4 mm.; p. 336. 



2. Alvania hakeri Bartsch; Type; length 1.4 mm.; p. 337. 



3. Alvania lirata Carpenter; length 2.8 mm.; p. 338. 



4. Alvania pedroana Barlsch; Type; length 2.2 mm.; p. 341. 



5. Alvania aurivillii Dall; T^'pe; length 4.2 mm.; p. 336. 



6. Alvania albolirata Carpenter; Tj^je; length 3 mm.; p. 338. 



7. Alvania trachisma Bartsch; Type; length 3.3 mm.; p. 339. 



8. Alvania carpenteriVi^ einkawH; Type; length 2 mm.; p. 341. 



9. Alvania californica Bartsch; Type; length 2.5 mm.; p. 340. 



Plate 30. 



Fig. 1. Alvania alashana Dall; Type; length 2.9 mm.; p. 343. 



2. Albania montereyensis Bartsch; Tj^pe; length 2.3 mm.; p. 343. 



3. Alvania hoodensis Bartsch; Type; length 2.5 mm.; p. 345. 



4. Alvania electrina Carpenter; Tyi:)e; length 2.7 mm.; p. 346. 



5. Alvania profundicola Bartsch; Type; length 3.2 mm.; p. 345. 



6. Alvania excurvata Car^ienieT; Type; length 2.8 mm.; p. 344. 



After a camera lucida sketch by Doctor Carpenter. 



7. ^Zrania/Zosa Carpenter; Type; length 3.5 mm.; p. 342. 



8. Alvania nemo Bartsch; Type; length 2.6 mm.; p. 348. 



9. Alvania galapagensis Bartsch; Type; length 3.3 mm.; p. 347. 



Plate 31. 



Fig. 1. Alvania purpurea Dall; length 2.6 mm.; p. 353. 



2. Alvania iliuliukensis Bartsch; Type; length 3 mm.; p. 350. 



3. Alvania acutilirata Carpenter; Type; length 2.3 mm.; p. 352. 



4. Alvania cosmia Bartsch; TjT)e; length 2.2 mm.; p. 352. 



5. Alvania halia Bartsch; Type; length 2.4 mm.; p. 354. 



6. Alvanis rosana Bartsch; Type; length 2.6 mm.; p. 349. 



7. Alvania compacta Carpenter; Tj-pe; length 3 mm.; p. 351. 



8. Alvania fossilis Bartsch; Type; length 2 mm.; p. 349. ♦ 



Plate 32. 



Fig. 1. Alvania almo Bartsch; Tj^pe; length 1.5 mm.; p. 359. 



2. Alvania tumida Carpenter; length 1.2 mm.; p. 361. 



3. Alvania oldroydas Bartsch; Type; length 1.6 mm.; p. 360. 



4. Alvania clarionensis 'Qaxisch.; Type; length 2.9 mm.; p. 356. 



5. Alvania effusa Carpenter; Type; length 2.9 mm.; p. 358. 



After a camera lucida sketch by Doctor Carpenter. 



6. Alvania lara Bartsch; Tj'pe; length 2.5 mm.; p. 357. 



7. Alvania sequisculpta Keep; Tj^pe; length 3.2 mm.; p. 358. 



8. Alvania ima Bartsch; Type; length 2 mm.; p. 355. 



