64 PALAEONTOLOGY OF NEW YORK. 



of Clarksville, Albany county ; and at Schoharie, Schoharie county. In the 

 Corniferous limestone, on Schultz's Farm, near Clarence, Erie county; Port 

 Colborne, Province of Ontario; Falls of the Ohio. Dalmanites (Chasmops) 

 anchiops, varieties armatus anil sobrimis : Schoharie grit, Albany and Schoharie 

 counties. The variety armatus has also been found in the Upper Helderberg 

 limestones at Arched Rock, Mackinac, Michigan. 



Dalmanites (Chasmops) Calypso. 



PLATE XI A, FIGS. 19-22 



Ddhrumia Calypso, Hall. Descrip. New Species of Fossils, etc., p. 01. 1861. 



'ypso, Hall. Fifteenth Rept. N. Y. State Cab. Nat. Hist., p. 89. 1862. 

 Dalmanites Calypso, Hall. Illustrations of Devonian Fossils, pi. xiii, figs. 1, 2. 1876. 



General Form and Proportions. Outline elongate-elliptical, posteriorly sub- 

 acuminate; length to width as 2 to 1. 



Surface convex, axially elevated, sub-equally trilobate. 



Cephalon. Outline sub-semi-circular, length to width as 1 to 2. Border thin, 

 moderately broad, flattened on the anterior limb, depressed at the sides, and 

 produced at the genal angles into conspicuous spines. Surface convex, 

 somewhat flattened axially. 



Facial Sutures taking their origin on the lateral margins just in front of the 

 genal spines, thence following a direction normal for this genus. Upon the 



fr hecks they lie in a broad, conspicuous sulcus, which unites with the 



sulcus at the base of the eye and becomes obsolete upon the margin. 



Glabella elongate-sub-pentagonal, widest anteriorly; length and width 

 equal. Surface gently rounded, depressed above. Anterior or frontal lobe 

 large, transversely sub-elliptical or sub-rhomboidal ; first pair of lateral 

 furrows strong, inclined posteriorly and passing three-fourths the distance 

 across the glabella; first and second glabellar lobes coalescing, r en i form, ele- 

 vate,] at their outer margins ; second lateral furrows obsolete except at their 

 proximal extremities, where they are represented by two deep depressions 

 or]. its; third glabellar lobes inconspicuous, transverse and separated from 

 the coalesced first and second lobes by the faint third pair of lateral furrows. 



