458 PROCEEDINGS OF THE ACADEMY OF [1896. 



In this article Bulimulus (Ncesiotus) duncanus, B, amastroides 

 Ancey var. Anceyi, B. jacobl var. vermiculatus, B. olla, B. tortu- 

 ganus, B. Bauri, Hyalinia chathamensis, Conulus galapaganus and 

 Succinea corbis are described as new, and the relationship of the 

 Ncesioti to the North American Bulimuli of the type of serperastrus 

 is pointed out. 



Dall, William He ale y. New species of land shells from the 

 Galapagos Islands. Nautilus, March, 1895, Vol. viii, pp. 126-7. 



Bidimulus {Ncesiotus) Reibischi and B. Tannerl are described as 

 new. 



EXPLANATION OF PLATES. 



Note. — Since the figures are of different degress of magnification, 

 the length of each shell in millimeters follows the reference to each 

 figure. 



Plate XV. 



Helicina (Idesa) nesiotlca Dall, base, lat. 3.7 mm. ; p. 451. 

 Hellcina (Idesa) nesioticaDaU, j^rofile; p. 451. 

 Vitrea chathamensis Dall, base, lat. 3 mm. ; p. 448. 

 Succinea brevior Smith, alt. 12 mm. ; p. 449. 

 Succinea corbis Dall, alt. 7.0 mm. ; p. 450. 

 Succinea Bettii Smith, alt. 12 mm. ; p. 448. 

 Succinea producta Reibisch, alt. 11.5 mm. ; p. 449. 

 Trochomorpha f Bauri Dall, alt. 1.5 mm.; p. 447. 

 Trochomorpha f Bauri Dall, base, lat. 2.2 mm. ; p. 447. 

 Vitrea chathamensis Dall, lat. 3 mm. ; p. 448. 

 Conulus galajKiganus Dall, lat. 2.5 mm. ; p. 448. 

 Bulimulus Bauri Dall, alt. 10 mm. ; p. 441. 

 Bulimulus curtus Reibisch, alt. 9.6 mm. ; p. 442. 

 Bulimulus canalijerus Reibisch, alt. 9.5 mm. ; p. 442. 

 Bulimulussp. n., alt. 11.5 mm., from photograph ; p. 444. 

 Bulimulus amastroides Ancey, alt. 10 mm. ; p. 441. 



Plate XVI. 



Bulimulus nesioticus Dall, alt. 12 mm. ; p. 443. 

 Bulimulus olla Dall, alt. 15 mm.; p. 437. 

 Bulimulus planospira Ancey, alt. 19.25 mm. ; p. 432. 

 Bulimulus Reibischi Doll, alt. 10.5 mm. ; p. 444. 

 Bulimulus Tanneri Dall, alt. 11 mm.; p. 438. 

 Genitalia o^ Bulimulus nnx var* incrassatus Pfr. consider- 

 bly magnified ; the male and female orifices (IX, X) 

 open into a single vestibulum and are separated here by 

 an accident of dissection ; I, albumen gland ; II, herma- 

 phoditic duct ; III, ovotestis ; IV, oviduct or uterus ; V, 

 prostate ; VI, retx'actor penis ; VII, jDCnis sac ; VIII, 



