316 



pair of oblique furrows (occasionally others indistinctly 

 visible); strong, bifurcating occipital furrow; lunate eyes: 

 granulose thorax; abruptly deflected pleurae; semi-elliptical, 

 well-grooved pygidiuni, with strong border. 

 Found in the Encrinal limestone, at Section 5 (very rare). 

 Proetus rowi. (Green.) (Fig. 2G0.) (Pal. N. Y., Vol. 

 VII., p. 119, Pis. XXL, XXllI. ) 



Distinguishing ClmrHcters. — Semi-elliptical to semi-circular 

 cephalon ; broad flat border ; genal 

 spines reaching to fourth thoracic seg- 

 ment; simple, elongate sub-conate gla- 

 bella, sloping to a broadly rounded an- 

 terior extremity; lateral furrows absent ; 

 large lunate eyes; axis occupying more 

 than one-third the width of the thorax ; 

 pleural? with grooves ; pygidium with 

 nine or ten low, flattened annulations 

 in the axis, and six in the lateral lobes, 

 with indications of a seventh; con- 

 spicuously thickened border; smooth 

 or faintly pustulose surfaces. 

 Found at "Hamburg and Eighteen Mile Creek, Erie 

 County-' (Hall). Found in the Trilobite (?) beds, at Section 

 8 (R. P. Johnson). 



Proetus cur vimarchxatus. Hall. (?) (Fig. 261.) 

 {Froetus sp. Grabau: Faunas Ham. Group, p. 242. Com- 

 pare Pal. N. Y., Vol. VII., p. 94, PI. XXII.) 



D is t ing u is li in g Clmracters.— Sub-triangular glabella, 

 rounded anteriorly; three pair glabellar furrows, the last 

 pair curving strongly backwards and 

 reaching the occipital furrow, the two 

 anterior pair somewhat less curving, and 

 shorter. Surface strongly pustulose. The 

 specimen here described and figured re- 

 FiG. 261. Proetus tains oulv the glabella, which has the out- 



curvimarginatus. (?) ^ o 



pieurod'SlIm bed^i li^^© and pustulose character of P. curvi- 

 wanakah Cliff. (Origil umrginatus Ivoiw l^endleton, Indiana. 



Fig. 260. Proetus rotvi. 

 Outline of a small individ- 

 ual, enlarged to two 

 diameters (after Hall and 

 Clarke). 



