432 PROCEEDINGS OF THE ACADEMY OF [1896. 



Bulimuhts {Ncesiotus) ruqulosus Pfr., Nom. Hel. viv., p. 254, 1881 ; Ancey, 

 Bull. Soc. Mai. France, IV, p. 294, 1887, (Chatham Island) ; Stearns, Proc. 

 U. S. Nat. Mus., xvi, pp. 381, 426, 1893. _ 



B. rugulosus var. infuscafa Ancey, op. cit., p. 294, 1887, 



? Bulimulus [Aasio'lus) midus Reibisch, Isis, 1892, p. 9, t. i, fig. 15. 



Not B. rugulosus Reibisch, Isis, 1892, p. 7, t. i, figs. 11 a-b, = B.perspec- 

 tivus Pfr. 



Under stones near the shore, Blackbeaeh Road, Charles Island, 

 Dr. Baur ; Charles Island, Darwin and Wolf; Chatham Island, 

 Darwin, Kellett and Cuming. 



Jaw thin, membranaceous, light horn-colored, low, wide, arcuate, 

 of equal height throughout, ending bluntly ; anterior surface with 

 about 20 broad, flat ribs, their outer edges reinforced, the margins 

 of the jaw squarely denticulated by the projecting ends of the ribs. 



Some varieties of B. nux approach this species quite closely, espe- 

 cially that to which Reibisch gave the name of invalidus. 



Bulimulus (Naesiotus) planospira Ancey, Plate XVI, figure 3. 



Bulimus eschariferus Reeve, Conch Icon., pi. xx, fig. 121 (bad, text excL), 

 1848. 



Bulimulus rugulosus var. planospira Ancey, Bull. Soc. Mai. de France, IV, 

 p. 294, 1887. 



Bulimulus rugulosus Reeve (Smith, in lilt.) ex parte. 



Northeast end of Charles Island, at about 200 feet. Dr. Baur. 



This is one of the most elegant species of the group. It is very 

 closely related to B. rtigulosus from which it may be discriminated 

 by its larger size and greater number of whorls, and by the deeper 

 suture and more lax manner in which the last whorl is coiled. In 

 B. planospira the spiral sculpture is usually more elevated and con- 

 spicuou.s. It has been found only on a limited portion of Charles 

 Island, while rugulosus is common on both Charles and Chatham. 

 As this form has not been figured I include a figure of it. 



Bulimulus (Naesiotus) ustulatus Sowerby. 



Bulinus ustulatus Sby., P. Z. S., 1833, p. 72, (Charles Island) ; Conch. 111., 

 p. 6, fig. 42, 1833.. 



Buhmus ustulatus Desh.in Lam. An. s. Vert., ed. II, vol. viii, p. 279, 1838; 

 Pfr., Mon. Hel. Viv., II, p. 217, 1848 ; Kuster, in Chemn. Conch. Cab., ed. 

 II, Bulii7ius, t. 62, figs. 16-18; Reeve, Conch. Icon., pi. xxi, fig. 130, 1848. 



Buliminus ustulatus Beck, Ind. Moll., p. 70, 1838. 



Bulimtdus [Ompkalostyla) ustulatus H. & A. Ad., Gen. Rec. Moll., II, p. 

 161,1855. 



Bulimus [Nirsiotus^ ustulatus Albers, Heliceen, p. 162, 1850. 



Bulimulus iNesiotes) ustulatus Martens in Albers, ed. ii, p. 221, I860. 



Bulimulus [Na-siotus) ustulatus Vir., Nom. Hel. Viv., p. 254, 1881; Stearns, 

 Proc. U. S. Nat. Mus., xvi, p. 427, 1893. 



Bulimulus {NtFsiotus) venustus Reibisch, Isis, 1892, p. 5, t. i, fig. 7 ; not B. 

 ustulatus Reibisch, Isis, 1892, p. 4, t. i, fig. 5, = nux var. 



Charles Island, Cuming. 



