Subfamilies, Genera, and Subgenera — Recent and Fossil 173 



1870. Phniorbiila Dall, Ann. N. Y. Lye. N. H., IX, p. 352. Type Planorhis armigerus 



Say. As subgenus of Segmentimi 

 1870. Segmentina Tryon, Con. Hald. Mon., p. 213 (non Fleming). No type cited but 



Planorhis armigerus Say, listed. 



1883. Planorbula Fischer, Man. de Conch., p. 509. Type Planorhis armigerus Say. 



As subgenus of Planorbis 



1884. Planorbula Tryon, S. & S. Conch., Ill, p. 107. Type Segmentina armigera (Say). 



Subgenus of Segmentina 



1886. Planorbula Clessin, Conch. Cab., XVII, p. 35. Type Planorbula armigera (Say). 

 As genus 



1899. Planorbulina M.\rtexs, Biol. Cent. Amer., Moll., p. 400. Clerical error for Pla- 

 norbula. May equal Tropicorbis in part. For group of Planorhis armigerus Say 



1902. Planorbula F. C. Baker, Moll. Chicago Area, Part II, p. 300. Radula figured. 

 As subgenus of Segmentina 



1905. Planorbula Dall, Alaska Moll., p. 97. Type Planorbis armigerus Say. As sub- 



genus of Segmentina 



1906. Planorbula Pilsbry and Ferriss, Proc. Acad. X'at. Sci,. Phil., p. 166. As sub- 



genus of Segmentina 



1909. Planorbula Pallary, Mem. Inst. Egypt, VI, p. 59. As genus. Doubts that Pla- 

 norbula of America is found in Egypt 



1912. Segmentina (part) Hannib.^l, Proc. Mai. Soc. London, X, p. 154. A group 

 mixture, but includes Planorbula of Haldeman. 



1918. Planorbula Walker, Miscel. Papers Mus. Zool., Univ. Mich., X^o. 6, pp. 14, 104. 

 Type Planorbis armigerus Say. Shell and radula. As subgenus of Segmentina 



1923. Planorbula Germain, Rec. Ind. Mus., XXI, p. 179. Type Planorbis armigerus 

 Say. As genus 



1926. Planorbula F. C. Baker, Trans. Wis. Acad. Sci., Arts, and Lett., XXII, p. 203. 

 Type Planorbis armigerus Say. As genus 



1926. Planorbula Lindholm, Archiv. fiir Mollusk., 58 year, Heft 6, p. 258. Thinks it 



should be separate genus 



1927. Planorbula Pilsbry and Bequaert. Bull. Amer. Mus. N. H., LIII, p. 131. Mono- 



type Planorbis armigerus Say. As genus 



1928. Planorbula F. C. Baker, Fresh-water Moll. Wis., I, p. 353. Type Planorbis 



armigerus Say. Genitalia, jaw and radula figured. As genus 



1930. Planorbula H. B. Baker, Occ. Papers Mus. Zool., Univ. Mich., No. 210, p. 43. 



Monotype Planorbis armigerus Say. As genus 



1931. Planorbula Thiele, Handbuch, 2 Teil, p. 480. Type Planorbis armigerus Say. 



As genus 

 1934. Planorbula Pilsbry, Proc. Acad. Nat. Sci. Phil., 86, p. 54. Form of pro.state and 



presence of penial gland indicated 

 1934. Planorbulina Pilsbry, loc. cit., p. 54. Typographical error of von Martens for 



Planorbula. Type designated by Pilsbry Planorhis armigerus Say 

 1940. Planorbula H..\ldeman, Morrison, Nautilus, LIV, p. 65. Notes correct date of 



publication, Oct. 1840 



Subgenus PLANORBULA SS. 



Type by original designation Planorbis arjnigerus Say 



Shell (plate 79, figs. 25-27). Small, ultradextral, of few closely coiled 

 whorls, slowly increasing in diameter, with flatly rounded whorls above 

 and a wide depression below, the body whorl usually carinate in the 

 middle; lips more or less thickened by a varix. Aperture with six lamellae 

 situated well within, placed as follows: a large parietal lamella, somewhat 

 sigmoid, obliquely transverse, with a small tubercular lamella below, at 

 the left end of the parietal lamella; four palatal lamellae (plate 76, fig. 8), 

 a large slightly transverse basal (4), a large lower palatal (3) which is 



