290 AZECA. 



ovate, less narrow above than in Ferussacia, and with a tendency 

 to be toothed, either near the upper end of the parietal callus, 

 in the middle of the parietal wall, or on all margins; columella 

 abruptly truncate at the base at all stages of growth. 



The penis has a long club-shaped appendix ; radula with 

 about 20,1,20 teeth, the laterals bicuspid. 



Type A. menkeana goodalli. Distribution, central and south- 

 ern Europe and north Africa. 



In the present condition of our knowledge of the soft anatomy 

 of these snails, I see no sufficient cause for separating Hypnophila 

 and Azeca generically. Oryptazeca also seems similar by the 

 compact shape and truncate columella of the shell, but the 

 absence of any apertural teeth or calluses whatever may be held 

 to sufficiently characterize it as a distinct genus; moreover, the 

 soft anatomy of Oryptazeca is that of Ferussacia, so far as known. 

 The modern subgenera of Azeca are evidently relics of an old 

 stock, which seems to have passed its acme. 



Subgenera of Azeca. 



a. Aperture conspicuously toothed or lamellate on both outer 

 and inner margins. Azeca, s. str., species 1, 2. 



a 1 . No teeth or lamell in outer lip. 



b. Parietal callus thickened with the edge calloused near 

 the posterior angle; columella truncate, at least in ob- 

 lique view. Subgenus Hypnophila, sp. 3 to 14. 

 b l . Parietal callus thin; not toothed; columella scarcely 

 truncate. Subgenus Gomphroa, sp. 15, 16. 



Subgenus AZECA, s. str. 



Azeca (" adopted from Dr. Leach") TURTON, Manual of the 

 land and fresh-water shells of the British Islands, pp. 6, 68, 

 "type Turbo tridens Montagu." LEACH, Synops. Moll. Great 

 Britain, edit. Gray, 1852, p. 88, for A. matoni Lesich=A. m. 

 goodalli. Azecastrum BOURGUIGNAT, Ame"nite*s Malac., ii, p. 87 

 (1858), type A. tridens. PFR., Monographia Heliceorum 

 Viventium, iii, 521, etc., in part. KNIGHT, Journal of Conch., 

 ix, p. 275 (derivation of name Azeca). Odontalus PARKEYSS, 

 Systemat. Verzeich. Oesterreich Land- u. Fluss-Conch., in 



