ANOSTOMA. 115 



globulosa LAM., An. s. Vert, vi, pt. 2, p. 102; edit. Desh., viii, p. 

 153 BECK, Index, p. 34 REEVE, Conch. Syst. ii, pi. 168, f. 2. 

 A. globutosum KttSTER, Conchyl. Cab., Helix, pi. 101, figs. 29-32. 

 DESHAYES in Encycl. Me"th., ii, p. 52, and in Fe>., Histoire, i, p. 

 399. PFR., Monogr. i, p. 3 ; iii, 284 ; iv, 327 ; v, 438 REEVE, 

 Conch. Icon. f. 2 a, b FISCHER, Journ. de Conchyl. 1869, p. 209, 

 pi. 11, f. 1-5; 1871, p. 261, pi. 11, f. 4-8 (anatomy). ^nosfowa 

 globulosa MACGILL., Conch. Text-book, ed. vi, p. 106, pi. 13, f. 25. 



Helix globulosa GUERIN, Iconogr. Moll., pi. 6, f. 2 Helix (Heli- 



codonta) ringicula FER., Prodr., no. 114; Hist., pi. 53, f. 1, 2 



Anostoma ringiculum SCHAUF., in Paetel's Catal., p. 98. Helicodon 

 ringiculus SOWB., Catal. Shells Coll. Tankerville, p. 35, no. 888 

 (1825). Anostoma hexodon F. DE WALDHEIM, Mus. Demidoff, 

 iii, p. 231 (1807). ? Lucerna antigua HUMPHREY, Museum Calon- 

 nianum, p. 61, no. 1128 (1797). 



Variable in size, degree of carination, and development of the 

 wrinkle-sculpture ; some specimens being merely striate, with only 

 traces of corrugation, while others, usually the larger specimens, are 

 strongly corrugated beneath and above the keel on the last whorl. 

 In a series of seventeen specimens in the collection of the Academy 

 there seems to be a gradual passage between the extremes. In one 

 specimen there is a fold midway between the two palatals (fig. 61). 



The size of the perforation in the peristome varies widely, in 

 specimens of the same size, and it may enter either directly or 

 obliquely. The maculation of the base is usually rather sparse, but 

 occasionally copious, and in one specimen before me spots are want- 

 ing. 



A. ringens is the longest-known and commonest species of the 

 genus, yet no definite locality for it has been published. 



A. CARINATUM Pfeiffer. PL 7, figs. 62, 63. 



Shell with a long basal suture, conoid-lenticular, rather solid, acutely 

 carinate ; pale, narrowly banded with chestnut above the keel and 

 at the suture. Spire shortly conoid ; whorls 5, rather flattened, the 

 upper ones striatulate, the last with irregular and waved rib-striae ; 

 the base convex, spotted with chestnut, scrobiculate in front. Aper- 

 ture following the slope of the spire, semicircular, contracted by six 

 strong, curved lamellae ; peristome white, broadly expanded and re- 

 flexed, the right margin provided with a large foramen at its inser- 

 tion. Alt. 13, greater diam. 24J, lesser 19 mill. (Pfr.). 



