. Bulletin - United States National Museum. Science. EASTERN PROVINCE NORTHERN REGION SPECIES. 193 Family STENOGYRID^. FERUSSACIA, Eisso. Animal heliciform, as in Patula, obtuse before, pointed beliiud; man- tle subcentral, thin, simj)le, i^rotected by a shell; anal and respiratory orifices on tbe right of mantle, under the peristome Fig. 199. of the shell; generative orifice behind the right eye-peduncle; no locomotive disk; no caudal mu- cous pore. Shell ovate-oblong, imperforate, smooth, pellucid, ^^^^, ^, Femssada. glistening, dark horn-colored; whorls rather con- (Keeve.) vex; aperture le
. Bulletin - United States National Museum. Science. EASTERN PROVINCE NORTHERN REGION SPECIES. 193 Family STENOGYRID^. FERUSSACIA, Eisso. Animal heliciform, as in Patula, obtuse before, pointed beliiud; man- tle subcentral, thin, simj)le, i^rotected by a shell; anal and respiratory orifices on tbe right of mantle, under the peristome Fig. 199. of the shell; generative orifice behind the right eye-peduncle; no locomotive disk; no caudal mu- cous pore. Shell ovate-oblong, imperforate, smooth, pellucid, ^^^^, ^, Femssada. glistening, dark horn-colored; whorls rather con- (Keeve.) vex; aperture less than one-half the shell's lengthj ovate; columella more or less truncated ; peristome blunt, its margins joined by callus. The genus seems most developed around the Mediterranean Sea, but it is found also in Madeira and Australia. Our only species is circum- polar. The jaw is low, slightly arcuate, wide, with but slightly attenuated, blunt ends; cutting edge with a slightly produced, wide, median pro- jection; anterior surface without ribs, but with fine vertical striffi. There is a strong muscular attachment on its upper margin. (See Fig. 200.) Lingual membrane as usual in the Eelicidw. Plate IV, Fig. E, of T. M. U. S., V, as well as that of the jaw, I drew from a Maine specimen, furnished by Mr. Anson Allen. ' ' '' Fig. 200. There were 24-1-24 teeth, with 8 perfect laterals. The central teeth are small and narrow in proportion to the laterals, with a long, narrow base oi attachment, expanding at its lower angles. The reflected portion is very small, tricuspid; the central cusp stout, short; the side cusps small, blunt; all the cusps bear short cutting points. The lateral teeth are about as wide as high in their base of attachment, which iis subrectangular. The whole upper edge is squarely reflected. The reflection is very fig. 201. short, and bears a stout, blunt, long, inner cusp, ^-^^^ C^"^^^ reaching almost to the lower edge of the base of ) \(-^ attachment, and be
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