PLATE XXVI. 



Fig. 1. Dentalium sericatum Dall ; 13.0. Page 423. 



" 2. Turbonilla interrupta Totten ; foot of animal from below, greatly 

 magnified. Page 337. 



2 b. Turbonilla interrupta Totten ; animal from above. Page 337. 



3. TarritellayucatecajiaDaW; 16.5. Page 265. 



4. Siliquaria modesta Dall ; 26.0. Page 260. 



5. Dentalium ceratum Dall ; 30.0. Page 424. 



6. Bivonia exserta Dall, young in first stage ; 11.0. Page 264. 



7. Pundurella circularis Dall ; from below ; 5.75. Page 403. 

 7 b. Pundurella circularis Dall, profile; 5.75. Page 403. 

 7 c. Turbonilla curta Dall ; the aperture is imperfect ; 8.3. Page 337. 



7 (1. Turbonilla belotheca Dall ; 14.0. Page 335. 



8. Puncturella trifolium Dall, from below ; 14.0. Page 403. 



8 b. Puncturella trifolium Dall, profile ; 14.0. Page 403. 

 8 c. Hanleyia tropicalis Dall ; medial valve ; 4.0. Page 415. 

 8 d. Hanleyia tropicalis Dall ; posterior valve ; 3.0. Page 415. 



9. Dentalium ophiodon Ball; 12.5. Page 427. 

 10. Maihilda barbadense Dall ; 6.2. Page 266. 



