NAPLES FAUNA IN WESTERN NEW YORK, PART 2 269 



it should be regarded a varietal form of that species, specially distinguished 

 by its corrugated surface. One of the specimens figured on plate 12 shows 

 in the character of its sculpture still closer approach to P. venusta. For 

 comparison with the characters of the latter species reference is made to 

 the figures given by Miinster and Freeh. 1 



kochia Freeh. 1891 



The shells of Kochia 2 have the aspect of capulid gastropods, the left 

 valve being strongly convex, with arched and incurved beak twisted back- 

 ward, while the right valve is flat, depressed or concave, when the valves 

 are found conjoined appearing like an operculum to the larger valve. The 

 wings are small and suppressed ; the ligament area clearly striated, elevated, 

 short and concave ; teeth are wholly wanting ; and the whole expression of 

 the shell is very unlike that of other Aviculidae, though from these shells 

 the genus may be regarded as derived. They were early noticed in the 

 rhenish Devonic and were referred to the Capulidae (Naticopsis) by 

 Roemer, but their proper place was recognized by Gosselet, Kayser and 

 others, the late C. Koch introducing for them the generic term Roemeria (a 

 preoccupied name) and Sandberger proposing to call them Onychia, reject- 

 ing the name Roemeria because of its employment among the fossil plants. 

 The leading species of this genus, Kochia capuliformis Koch, is 

 widespread in the lowest horizons of the Lower Devonic (Taunus quartzite 

 and Siegen greywack). 



We have found a single well characterized species of this genus in the 

 Portage fauna, less extreme than K. capuliformis in the elevation and 

 incurvature of the larger valve and thus far showing no evidence of the 

 cardinal area. In some respects these bodies suggest the cardioid species 

 with large larval shells referred to by Barrande under the name Slava 

 (Etage E) and which Freeh and Beushausen term Tiaraconcha (T. 

 scalariformis Beush. Martenberg, Oberscheld ; T. rugosa Kayser, 



1 Op. cit. pi. 14, fig. 15, A, B. 



2 Frech. Die devonischen Aviculiden Deutschlands. 1891. p. 72. 



