280 TROCHID.E. 



not larger than those on the base of our shell, while its base is 

 nearly smootli ; its umbilicus is much smaller. In color, size, and 

 general shape, the shells are alike. 



Margarita minutissima. 



Shell very minute, sub-ovately globose ; whorls three, convex, longitudinally 

 furrowed; spire short, obtuse; suture strongly impressed; aperture orbicular, 

 umbilicus large, deep. 



Margarita minutisnimn , Mighels, Best. Journ. iv. 349, pi. 16, fig. 5 (1843). — Stimp- 

 SON, Check Lists, 4. 



Shell very minute, sub-discoiclal, globular-ovate, of a dull ash 

 color ; whorls three, convex, with distinct longitudinal, approximate 

 Fig. 540. s^iltji^ running obliquely, and disappearing as they ap- 

 proach the umbilical region ; spire very low and obtuse 

 I at the apex ; suture deep, aperture circular ; lip sharp 

 and nearly continuous posteriorly ; umbilicus large and 

 profound. Length, about one fifth of an inch; breadth, 

 about equal to the length. 

 Casco Bay. 



I have never found but a single specimen of this shell, which I 

 took from the stomach of a haddock. It is not very nearly allied 

 to any of the other species found on the coast. Under a magnifier, 

 it somewhat resembles M. varicosa, Nob., in the ultimate whorl. 

 It is, however, readily distinguished by its very depressed and ob- 

 tuse spire (^Mighels). 



Margarita tindulata. 



Fig. 172*. 



Shell orbicular, low-conical, dark flesh-color, encircled with regularly disposed 

 spiral lines, alternately larger and smaller, coarsely plaited at the sutures. 



Margarita unduhta, Sowerby, Malacol. and Conchol. Mag. i. 26; roncliol Illust. (]\lar- 

 garita), fig. 4. — Gould, Inv. 1st ed. 254, fig. 172*. -De Kay, N. Y. Moll. 109. — 

 Stimpson, Check Lists, 4. 



Margarita striata, var. Gro'iildiidica, Moi.ler, Ind. Moll. Gr. 



Turho incarnates, Coutiiouy, Best. Journ. Nat. Hist. ii. 98, pi. 3, fig. 13. 



Trochiis tuiiiiilus, Montagu, Leth. Suev. pi. 30, fig. 3. 



Shell thin, orbicular, depressed-conical, usually of a bright brown- 

 ish-red color; sometimes rose-red, at others pale flesh-colored ; whorls 

 four, convex, somewhat flattened above, undulated near the suture 

 by short folds or wrinkles, and encircled by numerous, elevated. 



