110 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
only superficial, since Couthouyella has neither a sinistral nucleus, 
nor a columellar fold of which the first is always, and the second 
usually, present in Pyramidellidae. The position of the eyes is 
characteristic of Eulimidae, to which family we refer the new genus. 
We are indebted to Messrs. Kurtz and Stimpson for a manuscript 
figure of the animal. 
Couthouyella striatula (Couthouy). 
PI. 11, figs. 13, 16; PI. 14, figs. 56, 58. 
Pyramis sfriatulus Couthouy, Proc. Boston soc. nat. hist., vol. 2, p. 101, pi. 
1, fig. 6, 1839,^ Odostomia striatula (Couthouy) Verrill = Menestho albula 
auct. (not Turbo albulus O. Fabricius, 1780,= Odostomia (Menestho) albula 
O. Fabricius). 
Shell elongate-conic, strong, milk white. Nucleus composed of 
about one and one quarter smooth dextral turns. Early post-nuclear 
whorls well rounded, the later ones slightly rounded on the anterior 
two thirds between the sutures, having the summits appressed and 
somewhat excurved, which renders the outline of each turn slightly 
sigmoid. The space immediately anterior to the summit is smooth, 
barring the faint incremental lines which cover the entire surface of 
the shell; the rest is marked by low spiral cords of which there are 
four on the second, five on the third, and six on the fourth to sev- 
enth, after which the shell seems to reach a senile stage in which the 
spiral cords become much divided, less regular, and less strong. On 
the penultimate whorls of the adult shell there are fifteen low cords 
between the summit and the periphery. Sutures well impressed. 
Periphery rounded. Base moderately rounded, marked by eight 
spiral cords, those nearest the periphery being the best developed, the 
rest growing successively weaker, the anterior third of the base being 
unmarked. Aperture ovate, somewhat effuse anteriorly, posterior 
angle acute; outer lip thick within, curving to a sharp edge; columella 
curved, re-enforced for a little more than half its length by the base, 
reflexed in the free anterior portion. 
An adult specimen that has lost its nucleus and probably the first 
two and one half post-nuclear turns, measures: length, 13.6 mm.; 
diameter, 4.3 mm. 
Not one of all the adult specimens of this species that we have 
examined, was complete. In all, the early whorls were decollated. 
