212 PALEONTOLOGY OF NEW YORK. 



conditions of the shell. The striae towards the base of the shell are so closely 

 crowded that fragments of this part, when compared with the portions of the 

 surface towards the summit, might be mistaken for a distinct species. 



Portions of two individuals from the same locality preserve similar features ; 

 but other specimens are required for a full determination of the distinctive 

 characters. The length of the portion preserved in the specimen figured is 

 about 11 centimetres. 



Formation and locality. The only specimens of this species yet recognized are 

 in a calcareous shale, in the higher beds of the Hamilton group, upon the east 

 shore of Cayuga lake, N. Y. 



CONULARIA CONTINENS. 



PLATE XXXIII, KIG, 6,iPLATE XXXIV, FIGS. 3, i, 6 ; AND PLATE XXXIV A, FIG. 6. 



Conularia continens, Hall. Illustrations of Devonian Fossils :' Pferopoda, plate 28, figs. 4-6. 1876. 



Form regularly pyramidal, with the sides gently sloping from the apex, and 

 the angles a little projecting. Transverse section rectangular, with the 

 sides equal or subequal, and usually slightly concave in the middle, 

 convex towards the margins, and abruptly inflected into the furrow at the 

 angles. Faces of the pyramid equal, and without a distinct groove or 

 depression along the centre, which, however, is marked by an interruption 

 of the striae. Angles marked by a narrow, distinctly rounded furrow, into 

 which the surface-markings are extended. Aperture unknown ; the 

 summit has been truncated by a septum. 



Surface marked by regular and abruptly elevated, transverse stria?, which curve 

 gently forward, and along the mesial line are interruptedly alternating and 

 interlocking with each other, the extremities gradually dying out in the 

 interstriate spaces ; in some places the striae appear as if abruptly bent 

 forward, without alternation, along the middle. These striae are distant 

 from each other about three times their own width, and their crests are 

 ornamented by regularly arranged minute pustules, from which, on the 

 lower side, extend very slender ridges, reaching one-third or one-half 





