PLATE XXVII. 



Fig. 1. Dentalium laquentum Verrill ; 29.0. Page 426. 



" 2. Dentalium ceratum Dall, very young ; 7.0. Page 424. 



" 3. Dentalium carduus Dall ; 16.0. Page 423. 



" 4. Dentalium Gouldii Dall, var. obscurum ; 28.0. Page 424. 



" 5. Cadulus quadridentatus Dall, and outline of aperture, of which the 

 antero-posterior line is across the plate ; 10.0. Page 428. 



" 6. Dentalium perlongum Dall, and outline of aperture, of which the 

 antero-posterior line is across the plate ; 80.0. Page 419. 



" 7. Cadulus amiantus Dall; 5.75. Page 431. 



" 8. Cadulus lunula Dall, and outline of aperture, of which the antero- 

 posterior line is across the plate ; 6.0. Page 431. 



" 9. Caduhcs orqualis Dall, and outline of aperture, of which the antero- 

 posterior line is across the plate ; 15.0. Page 429. 



" 10. Dentalium callithrix Dall ; 25.0. Page 427. 



"11. Cadulus acus Dall ; 8. 0. Page 432. 



" 12. Dentalium ensiculus Jeffreys, and outline of aperture, of which the 

 antero-posterior line is across the plate ; 20.0. Page 428. 



" 12 a. Cadulus Watsoni Dall, and outline of aperture, of which the antero- 

 posterior line is across the plate ; 13.0. Page 429. 



" 12 b. Dentalium callipeplum Dall ; 36.0. Page 419. 



" 12 c. Cadulus Agassizii Dall, and outline of aperture, of which the antero- 

 posterior line is across the plate ; 9.0. Page 430. 



" 12 d. Cadulus cucurbita Dall, and outline of aperture, of which the antero- 

 posterior line is across the plate; 4.0. Page 431. 



