235 



Body-whorl convex, with a flattish base defined by the anterior 

 spiral ; anterior to the peripheral angulation, there are three or 

 four encircling threadlets. Aperture oval, outer lip thin. 



Dimensio7is. — Length, 7; width, 1'75; height of aperture, 1 "5 ; 

 an incomplete example has a greatest width of 2-5. 



Locality. — Eocene ; Muddy Creek ! 



19. Sealaria (Aerilla) glyphospipa, spec. nov. 



Shell minute, thin, slender, imperforate ; ordinary whorls five, 

 moderately convex, strongly costate and slenderly lirate ; the 

 apex is obtuse, and consists of two and a-half smooth large angu- 

 lated turns. 



The costpe are filiform, prominent, and slightly arched, equal 

 and equidistant, about 12 on the body-whorl. The spiral orna- 

 ment consists of narrow subacute threads, separated by wider 

 intervals, about 9 on the penultimate whorl ; the lira^ do not 

 cross the costpe. 



Body-whorl convex with a flattish spirally-lineate base, which 

 is margined by the anterior spiral-thread. Aperture oval, outer 

 lip thin. 



Dimefisions.- — Length, 4; width, 1. 



Locality. — ^Eocene ; Muddy Creek. 



20. Sealaria (Aerilla) mutiea, sjmc. nov. 



Shell small, elongate-turriculate, imperforate ; ordinary M'horls 

 six, moderately convex, costated and spirally lineate-sulcate ; 

 apex obtuse, consisting of two smooth convex whorls. 



The cost^e are moderately stout, distant, ten on the body-whorl ; 

 the intercostal spaces with about four to six engraved sjDiral 

 lines. Base of body-w^horl flatly-rounded, obscurely lirate, and 

 subangulated on the periphery ; aperture oval. 



Dhnensions. — Length, 5 ; width, 1 -25. 



Locality. — Eocene ; Muddy Creek ! (not uncommon). 



21. Sealaria (Aerilla) eylindraeea, w^c. nov. 



Shell small, rather stout, turriculate, imperforate ; ordinary 

 whorls eight, almost flat, costated, and obscurely lirate ; nuclear 

 w^horls four, gradually tapering to an acute apex. 



The costfe are stout, nearly straight, about ten to a whorl ; 

 the intercostal spaces with about five slender spiral threadlets. 

 Base subangulated, obsoletely spirally-lirate ; aperture oval. 



Di^nensioiiS.—ljQngth, 5 5 ; width, 1*75. 



Locality. — Eocene ; Muddy Creek. 



22. Sealaria (Aerilla) gonioides, -^pec. nov. 

 Shell minute, thin, elongate-turriculate, imperforate ; ordinary 

 whorls angulated post-medially, costated, and lirate ; nuclear 

 whorls two, smooth, shining, somewhat-tumid. 



