156 STREPTOSTYLA. 



Costa Rica: A/ajar de Cartago (Underwood). 



$. costaricensis DA C., Proc. Malac. Soc. Loud., vi, p. 6, pi. 

 1, f. 3 (March, 1904). 



'It much resembles S. cyiindracea Pfr., but is more ovate 

 and has a shorter aperture." Should be compared with S. 

 binneyana C. & F. 



28. S. BINNEYANA C. & P. Vol. I, p. 47. PI. 30, fig. 98. 

 Includes var. major Martens, according to that author. 



Von Martens' figure is copied, pi. 30, fig. 98. In my opinion 

 this form cannot be united with 8. vcntricosnla. 



29. S. THOMSONI Ancey. 



Shell subfusiform, rather thin, subpellucid, very glossy, 

 with an oily luster; amber-buff, ornamented with darker, 

 somewhat irregularly-placed streaks on the last whorl. Spire 

 long-conic, the apex minute, hardly obtuse. Whorls 8| (V), 

 subplanulate, regularly and slowly increasing, separated by a 

 narrow suture with slightly paler margin, obsoletely, closely 

 and minutely plicatulate in front of the suture, smooth; 

 last whorl large, cylindric at the sides, somewhat tapering 

 basally, a little convex above. Aperture vertical, pallid 

 within, narrow, sinuate-semioval. ColumelLar lamina white, 

 twisted, rather solid, thickened in the middle. Peristome 

 simple, rather obtuse, receding at base, sinuously produced in 

 the middle. Length 30, diam. 12, aperture 14 x 4.33 mm. 

 (Ancey) . 



Length 16.5, diam. 9.33, aperture 12.33x3.66 mm.; young 

 shell. 



Length 12, diam. 5.66, aperture 8x2 mm.; young shell. 



Utila Island, off Honduras (Simpson). 



8. thomsoni ANC., Annales de Malacologie 1886, p. 257. 



There is great variation in shape, especially among shells 

 of different ages, the last whorl being strongly conic in young 

 ones. 



30. S. VIRIDULA Aiigas. PI. 29, fig. 81. 



The shell is very obesely fusiform, the diameter exceeding 



