1896.] NATURAL SCIENCES OF PHILADELPHIA. 459 



vas deferens; IX, male; and X, female orifice, accidentally 

 parted ; XI, duct of spermatheca ; XII, spermatheca. 

 From a drawing by W. G. Binney, Esq., p. 429. 



Fig. 7. Bulimulus duncanus Dall, alt. 17.5 mm.; p. 438. 



Fig. 8. Succinea 6rei>ior Smith, camera lucida outline of jaw, con- 

 siderably magnified ; p. 449. 



Fig. 9. Leptinaria chathamensis Dall, alt. 3.5 mm.; p. 451. 



Fig. 10. Succinea producta Reibisch, outline of jaw, magnified, from 

 camera lucida sketch ; p. 449. 



Fig. 11, 12, 13. Bulimulus Simrothi Reibisch (tortuganus Dall) 

 showing variation in individuals and character of surface ; 

 alts, respectively 12.25, 11.0 and 10.75 mm. ; p. 440. 



Fig. 14. Bulimulus cinereus Reibisch, alt. 8.5 mm. ; p. 437. 



Plate XVII. 



Figures all drawn from camera lucida sketches. 



Fig. 1. Jaw of Bulimulus rugulosiis Sby., much magnified; p. 



431. 

 Fig. 2. 3 ?i^ oi Bulimulus Simrothi J)di\\; -p. AAO. 

 Fig. 3. Teeth of Bulimulus ventrosus Reibisch, central and inner 



lateral, 3a two exti'eme outer laterals or marginals ; p. 



434. 

 Fig. 4. Rhachidian and innermost lateral teeth of Bulimulus 



chemnitzioides Forbes ; 4a, three of the outermost laterals ; 



p. 445. 

 Fig. 5. Rhachidian, inner lateral and 5a, two outer lateral teeth 



of Succinea producta Reibisch ; p. 449. 

 Fig. 6. Rhachidian and adjacent laterals and 6a, one of the outer- 

 most laterals of Bulimulus unifasciatus Sby.; p. 439. 

 Fig. 7. Rhachidian tooth and adjacent laterals and 7a, two outer 



laterals of Bulimulus Bauri Dall ; p. 441. 

 Fig. 8. Rhachidian tooth, adjacent laterals and 8a, two outer 



laterals of Bulimulus citrtus Reibisch ; p. 442. 

 Fig. 9. Rhachidian tooth, adjacent lateral and 9a, two more mar- 

 ginal laterals oi Succinea brevior Smith; p. 449. 

 Fig. 10. Rhachidian and two adjacent lateral teeth and 10a, an 



outer lateral and marginal tooth of Bulimulus nux var. 



incrassatus Pfr. ; p. 429. 

 Fig. 11. Javf of Bulimulus U7iifasciatus Qhj.; p. 439. 

 Fig. 12. Rhachidian tooth, laterals of one side and part of the 



uncini of Helicina nesiotica Dall ; p. 451. 

 Fig. 13. Jaw of Bulimulus achatellinu.-< Forbes ] p. 428. 

 Fig. 14. Pupa Wolfii Miller (5a hH Dall, MS.) alt. 2.5 mm.; p. 



446. 

 Fig. 15. Jaw of Bulimulus Bauri Dall ; p. 441. 

 Fig. 16. Single tooth of Leptinaria chathamensis Dall, from a 



sketch by W. G. Binney, much magnified; p. 451. 



