98 VARICELLA, JAMAICA. 



41&. Var. unicolor (C. B. Adams). PL 16, fig. 5. 



"Species similar to the preceding, [ingallsiana] but the 

 shell is uniformly light brown, without 'any dark stripes; 

 the striae are rather more strongly impressed; the columella 

 is not arcuate; and the form is rather more slender. Mean 

 divergence 33; length .7 inch; breadth .21 inch; length of 

 aperture .33 inch." (Adams). 



The Adams collection contains one nearly adult shell (the 

 type), and -a young one. The type measures, length 17, 

 diam. 5.5, aperture 8.5 mm., with 6% whorls. There are 

 three varix-lines on each of the last two whorls. It is pale 

 rose, with colorless varix-streaks. There are about 4% striae 

 in a mm. on the last whorl. It- differs from V. a. ingallsiana 

 only in being a trifle more elongate, and without the faint 

 color-streaks of that form. 



41c. Var. gay ana (C. B. Adams). PI. 16, figs. 8, 9. 



"Shell well elongated ovate-fusiform: light brownish yel- 

 low, with a series of very distinct triangular spots of dark 

 brown, descending from the suture, about five or six on each 

 whorl : varicose coincidently with the brown spots, the varices 

 being rather feebly indicated, as in A. nitida ; with fine regu- 

 lar rather crowded transverse striag : apex subacute : spire with 

 the outlines a little convex: whorls seven or eight, rather 

 convex, with a well impressed suture : aperture long ovate, 

 acute above: labrum sharp and thin: columella nearly 

 straight, rather narrow and obliquely truncated. Mean di- 

 vergence 30, length .76 inch; greatest breadth .27 inch; 

 least breadth .25 inch ; length of aperture .36 inch. This rare 

 and elegant species is dedicated to my assistant Mr. A. M. 

 Gay, in testimony of his industry and rapid acquisitions in 

 natural history." (Adams). 



There are three examples in the Adams collection, two 

 larger than the immature type, and evidently added later, 

 but doubtless of exactly the same race. They measure : 



Length 22, diam. 6.9, aperture 9.5 mm. ; whorls 7%. 



Length 21, diam. 7, aperture 9.3 mm.; whorls 7%. 



The longer shell is very glossy, pale buff, the early whorls 



