BRACHYPODELLA, S.-G. STROPHINA. 55 



flexed, subangular at the termination of the keel. Internal 

 axis slender, encircled by two subequal lamellae, the edges of 

 which are serrate. 



Length 18.5, diam. 3.2-3.3 mm.; whorls 16%. 



Length 15, diam. 2.9 mm.; whorls 15. 



Length 14, diam. 2.7 mm.; whorls 17% (spire complete). 



Length 12.7, diam. 2.7 mm.; whorls 11. 



In one specimen retaining the apex, the nepionlc whorls are 

 smooth. 



Subgenus STROPHINA Morch, 1852. 

 Strophina MCH., Catal. Yoldi, pp. 35. 



Shell strong, obese, carinate below, the base excavated, last 

 whorl shortly free. Axis very thick and heavy, smooth, some- 

 what grooved along the partitions, and perceptibly compressed 

 mesially (pi. 8, fig. 60). 



The radula (pi. 10, fig. 19, B. laterradii var. strophina) is 

 large for the size of the shell, and the teeth resemble those of 

 Amphicosmia. The central has a long narrow cusp, but 

 slightly wider than its basal-plate'. The inner lateral tooth 

 has a stout ectocone, that of the outer lateral being decidedly 

 lower. There are 7 marginal teeth on each side. 



A relationship to Amphicosmia is shown by the weakly 

 biplicate axis. It also resembles the axis of Mychostoma. 



11. B. LATERRADII (Grateloup). PL 8, fig. 58. 



Shell cylindric-turrite, somewhat ventricose, umbilicate; 

 apex truncate; thin, obliquely and symmetrically plicate. 

 Yfhorls a little convex ; neck at the base angulate, subarcuate. 

 Aperture simple, subquadrate. Length 14 to 15, diam. in the 

 middle 5 mm. (Grat.). 



Santo Domingo: Island of Beate, or Beata, off the south 

 coast, between Cape Falso and Cape Mongon (Laterrade, 

 teste Morch.; Suensen, teste Pfr.). 



Clausilia laterradii GRAT., Actes de la Soc. Linn, de Bor- 

 deaux, xi, p. 430, pi. 2, f. 10 (1839). Cylindrella laterradii 

 Grat., PFR., Symbolag, ii, p. 137; Monogr., ii, p. 378. PHIL., 

 Abbild., i, p. 182, pi. 1, f. 18 (from Grat.) . CROSSE, J. de C., 



