CLINTON OEOUP. 



41 



Position and locality. This coral is found in the lower part of the group at Sodus in Wayne 

 county, at Rochester on the Genesee river, at Reynale's Basin and Lockport in Niagara county, 

 and at Flamborough Head in Canada West, always in the lower part of the group, and very 

 rarely in the higher part. {State Collection.) 



418. 2. FAVISTELLA FAVOSIDEA {n. sp.). 



PL. XVII. Figs. 2 a -/. 



Corallum spheroidal, hemispheric or flattened, increasing by lateral and interstitial additions 

 of new cells ; cells sometimes radiating from a centre, in others they are nearly parallel, and 

 rise from a broad base, increasing on all sides by the addition of new cells ; cells opening upon 

 the surface by four, five or six-sided mouths, the margins elevated, and the separating walls 

 apparently double ; rays often obsolete or broken away, so that they are only presented as 

 projections from the walls of the cells. 



This species has the general ap2>earance of a Favosites, with cells a little larger than F. 

 gothlandica ; and would readily be confounded with that on cursory examination, as it has al- 

 ways been heretofore. A careful examination always shows the remains of rays projecting from 

 the walls of the cells ; and by grinding down good specimens, the true character can be readily 

 ascertained. The cells are smaller than F. stellata of the Hudson-river group, though it much 

 resembles that fossil in its general characters. 



Fig. 2 a. A fragment of a large mass : cells natural size. 



Fig. 2 b. Three of the cells enlarged, showing the double walls which coalesce at intervals. 



Fig. 2 c. A small spheroidal mass of the same species. 



Fig. 2 (f. A section of a spherical mass of this species, showing the radiating cells. 



Fig. 2 e. A small fragment showing the rays within the cells. 



Fig. 2/. Several of these cells enlarged, showing the rays, etc. 



Position and locality. Tliis coral occurs associated with Pentamerus oblongiis at Rochester, 

 and ui the same situation in the towns of Ontario and Sodus in Wayne county. It is also found 

 in the same position at Reynale's basin, Niagara county. {State Collection.) 



419. 1. CANINIA BILATERALIS {n. sp.). 



Pl. XVII. Figs. 3 a-h. 



Obliquely turbinate or obconical, anterior side increasing much more rapidly than the other, 

 very slightly curved ; cup opening obliquely with the axis of the coral, margin considerably 

 elevated above the centre ; rays (lamellee) from 20 to 50 (depending on the age of the coral), 

 curving towards the centre where they are irregularly contorted or coalescing, often running 

 into and uniting with a lamella on each side of a central longitudinal space, scarcely visible 

 externally, and increasing on one or two sides by the addition of new rays. ' Transverse dis- 

 sepiments highest in the centre, and curving abruptly downwards near the margin ; on the an- 



[ FALiONTOLOGy — Vo L. II.] 6 



