GLANDINA. 83 



Its cusp is generally simple, lonj;, and narrow ; Imt in G. msra it lias a (Iccidctd 

 blunt cuttini^ point, and in G. sem'itanmi it lias a Ion;?, slender cutting point; 

 for that of G. trnncdta, see below. 



The side teeth are all of the purely aeul(!ate type; the base of attachment 

 is long, narrow, incurved at sides, gradually rounded above, expanded and 

 bluntly truncated below, the general outline being somewhat like that of the 

 sole of a shoe. From this base of attachment springs a large aculeate cutting 

 point. These side teeth are like the marginals in Zonifcs, Limax, etc. ; they 

 may therefore be called marginal teeth, and the lateral teeth, usually present 

 in the Vitrinea, may be said to be entirely wanting. 



As stated above, the marginal teeth increase rapidly in size for a short dis- 

 tance from the median line, and then gradually decrease in size, as they pass 

 off laterally, the last tooth being still smaller than the first. 



In illustrating the dentition of this genus, I refer to the figure on p. 29 7, 

 Vol. II., to show the general arrangement en chevron of the rows of teeth. 

 Fig. A of my Plate I. is intended to show the shape of the individual teeth of 

 G. truncata from the central to the extreme marginal. 



I have not had an opportunity of examining the lingual membrane of G. 

 hullata, Texasiana, decussata, or Vanuxemensis. 



The restricted subgenus is confined almost exclusively to Mexico and Cen- 

 tral America, but several species are found in our Southern Region, even as far 

 north as South Carolina. There is also one Mediterranean species. 



Glandina Vanuxemensis, Lea. 



Vol. III. PI. LXIL Fig. 1. 



Shell elongated, ovate-fusiform, thin and fragile, considerably transparent, 

 pale fawn-color, in some specimens inclined to greenish, and generally flecked 

 with distant, pale spots ; the surface is, in a measure, coarsely granulated by 

 the decussation of longritudinal and revolving lines, the latter of which are 

 more distant from each other than the former, and become less and less dis- 

 tinct towards the anterior portion of the whorl ; whorls 7 or 8, the apical 

 ones smooth and forming a mammillary tip ; suture crenulated ; aperture about 

 one half the length of the shell, nearly three times as long as broad ; columella 

 strongly arched, and scarcely glazed by enamel. Length of axis, 68 mill; 

 breadth, 25 mill. 



Glandina Vanuxemensis, Lea, Trans. Am. Philos. Soc, Y. 84, PI. XIX. Fig. 78, 



Obs. I. 196 (1837). — Pfeiffer, Symbols, III. 91. — Binney, Terr. Moll., 11. 



299, PI. LXIL Fig. 1. — W. G. Binney, T. M., IV. 141 ; L. & Fr.-W. Sh., 



I. 15. —Fischer and Crosse, Moll. Mex., 100 (1870). 

 Glandina Vanuxemii, Tryon, Am. Journ. Conch., II. 226 (1866). 

 Achatina Vanuxemensis, Reeve, Conch. Icon., PI. XIII. Fig. 48. — Pfeiffer, 



Monog. Helic. Viv., II. 294. 

 Oleacina Vanuxemensis, Pfeiffer, Brit. Mus. Cat., 36; Mou. Hel., IV. 643. 



