280 FERUSSACIA, MADEIRA. 



north near Porto Moniz; also at Santa Cruz; under stones, very 

 rare. 



Achatina leacociana LOWE, Ann. Mag. Nat. Hist. (2 eer. ), ix, 

 p. 119 (1862); P. Z. S., 1854, p. 205. PAIVA Mon. Moll. 

 Mader. , p. 105. PFR., Monogr. , iii, 511. Lovea leacockiana 

 WOLLASTON, Test. Atlant., p. 249. 



The small, fragile shell is shaped much like C. lubrica, from 

 which it differs conspicuously by the wide truncate columella 

 and the strongly arcuate very thin outer lip. It has been re- 

 ported by Paiva from Sao Lourengo Point; but is not present in 

 the collection made there by Mr. Grabham, who found speci- 

 mens at Santa Cruz. 



Subgenus CYLICHNIDIA Lowe. 



Cylichnidia, LOWE, Ann. Mag. N. H. (2), ix, 1852, p. 119 

 (for A. leacociana and cylichna; A. ovuliformis also mentioned) ; 

 P. Z. S. 1854, p. 206, type A. ovuliformis. 



Shell short, elliptical-ovate, somewhat pupiform, composed 

 of few whorls, 4 to 5; aperture piriform, contracted by a strong 

 parietal lamella and sometimes supraparietel and palatal folds; 

 columella plicate or horizontally truncate at base. Type F. 

 ovuliformis. 



This group is remarkable for its apertural plica? and lamella. 

 F. cylichna, a decidedly phylogerontic form as ghown by the ab- 

 normal development of the parietal callus, is now extinct. In 

 its apertural armature Cylichnidia apparently shows relationship 

 to Azeca and to Calaxis. 



73. F. OVULIFORMIS (Lowe). PI. 39, fig. 23; pi. 40, figs. 36, 37. 



"Shell narrowly elliptical somewhat pupiform, of equal 

 width at the two ends, short, glossy, smooth. Spire very ob- 

 tuse, half the length of the shell. Whorls slightly convex, 

 somewhat swollen; suture distinct. Aperture obovate, narrow, 

 biplicate, one fold transverse, abrupt and prominent, situated 

 midway between the columella and angle of the lip, the other 

 at the columella, more obsolete, oblique. Columella expanded, 

 thin, twisted, obliquely truncate. Length 2, diam. 1 line, 

 whorls 4 " (Lowe). 



