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 bearing a long, blunt, cutting 



Linjiual dpntition of J^. 



point, which reaches beyond the lower edge. The subcylindrica. 



outer side cusj* of the reflection is widely separated from the inner cusp, 

 I741)^Bull. 28— —13 



