58 TRUNCATELLINA. 



The two localities known for S. calamitosa are near to- 

 gether. Orcutt reports it as found under decaying Mesem- 

 bryanthemum equilaterale. In both places it was found with 

 N. hemphilli. 



Genus TRUNCATELLINA Lowe. 



Truncatellina LOWE, Ann. Mag. N. H. (2), ix, April 1852, 

 p. 275, for Pupa linearis Lowe only; Proc. Zool. Soc. London, 

 1854, p. 207 (March 16, 1855), P. minutissinia Hartm. desig- 

 nated as type. v. MARTENS, Nachrbl. d. M. Ges., 1878, p. 38. 

 Not " Truncatellwa Orb., Tabl. Meth. Ceph., 1826," SCUDDER, 

 Nomenclator Zool., 1882, p. 345, and Universal Index, p. 329, 

 error for Truncatulina Orbigny, Ann. Sci. Nat., vii, 1826, p. 

 278, Foranainifera. 



Isthmio Gray REINHARDT, Sitzungsber. Ges. Nat. Freunde 

 Berlin, 1879, p. 133 (review of species and their distribu- 

 tion) ; Nachrichtsblatt deutschen Malak. Ges., 48, 1916, p. 

 158. WESTERLUND, Fauna. Pal. Reg. Binneuconch, iii, 1887, 

 pp. 126-129. KOBELT, Iconographie Land- und Siisswasser- 

 Moll. (n. F.), viii, p. 83. Not Isthmia Gray, see Vol. XXV, 

 p. 71. (Misspelled Jothmia in Beilage Jahresh. Ver. Vaterl. 

 Naturk. Wurttemb. 68 Jahrg., 1912, p. 33, and Istmia in Pae- 

 tel's Catalog, 1889.) 



Laurinella HESSE, Nachrichtsbl. d. Malak. Ges. 47, 1915, p. 

 53 ("fur die winzigeii Schnecken der minutissima-Gruuppe") ; 

 Pupa minutissinia auct. cylindrica Fer. here selected as 

 type. 



The shell is minute (1.2 to 2.5 mm. long in known species), 

 cylindric, with obtuse, rounded summit, and short, strongly 

 convex whorls. Aperture ovate, without defined sinulus, the 

 lip narrowly expanded, often thickened, outwardly a little 

 straightened; having one to three teeth (parietal, columellar 

 and lower palatal), or none; the columellar and lower palatal 

 more or less deeply immersed when present. 



Animal without inferior tentacles. The shell is carried 

 nearly upright. 



Type: T. linearis (Lowe). Distribution: Palsearctic and 

 Ethiopian regions; living under stones and wood. 



