PROCEEDINGS OF THE NATIONAL MUSEUM. 225 



EXPLANATION OF PLATES. 



Note. — As the figures of the plates are araplitied or reduced from the natural 

 8iz(^ in proportions whicli are not the same for all the figures, in the explauation 

 to the jdates, after the name of the species, the actual height or length of the speci- 

 men figured is given in millimeters. 



PLATE XV. 



Figs. I, 4. Holospira semisculpta Stearns; lou.23.0™™; p. 208. 

 2, 3. Holospira arizonetisis Stearns ; Ion. 13.0™"' ; p. 208. 

 5, 10. Capulus (Cyclothyca) corrugatm Stearns; alt. 3.0'""'; p, 212. 

 f), 7, 8. HeJlx {Arionta) coloradolinsis Stearns; max. diani. 1.5.25'"'"; p. 206. 

 1». Melania ( ? Gonlohusin) acutifilosa Stearns; alt. IG.f)'""' ; \i. 211. 

 11, 12, 13. Helix (Arionta) magdalenensix Stearns ; max. diam. 12.5"'"'; p. 207. 

 14. Mitra ( ? Costellaria) nodocancellafa Stearns ; alt. 10.0'""' ; p. 213. 



PLATE XVI. 



Figs. 1, 2. Periploma discus Stearns; Ion. 41.0"""; p. 222. 



3,4. Vetiericardia barbarensin Stearns; Ion. 16. 0'""^; p. 214. 



5,6. Venericardia ventricosa Gould; inside and outside view of type specimen; 



alt. 15.0""" ; p. 216. 

 7, 9. Miodon prolongalus Carpenter ; inside and outside view of typical speci- 

 men, from Middletoii Island, Alaska ; alt. 5.0'"'" ; p. 217. 

 8. Venericardia borealis Conrad ; inside view ; lou. 33.0'"'" ; p. 215. 



PLATE XVII. 



Figs. 1, 2. Chione effeminata Stearns; Ion. 13.0'"'"; p. 221. 



3,4. Lucitia a^quizonata Stearns; Ion. 46.25"""; p. 220. 

 5, 6. Lucinafilosa Stimpsou; lou. 40.0"'"' ; p. 220. 



Proc. N. M. 90 15 



