of Emmons, in Washington County, N. Y. 195 



Olenoides Foedi, n. sp. 



Plate I, figs. 5-56. 



Head rather strongly convex, frontal margin rounded, moder- 

 ately elevated and separated from the glabella by a groove of 

 medium width and depth. Glabella prominent, subquadri- 

 lateral, narrowing very slightly towards the broadly rounded 

 front; three pairs of short, obscure furrows occur well down 

 toward the dorsal furrow surrounding the glabella; occipital 

 ring well denned and bearing a spine that projects upward and 

 backward. Fixed cheeks about one-half the width of the gla- 

 bella and curving slightly downward from the glabella to the 

 palpebral lobe ; ocular ridge strong and extending to and con- 

 necting with the rim of the palpebral lobe ; eye situated midway 

 of the facial suture and rather prominent in size and position; 

 postero-lateral limbs short, broad and deeply grooved by the fur- 

 row within the posterior margin ; at a point midway of the lat- 

 ter, a broad angle is formed and a rudimentary spine indicated. 



The direction of the facial suture is well shown in the figure 

 of the head on the plate. A free cheek, associated in the same 

 hand specimen of rock, shows a low visual surface for the eye, 

 a marginal rim similar to that between the facial sutures, and a 

 short spine at the postero-lateral angle. 



The associated pygidium is moderately convex, and bears a 

 narrow, convex, median lobe, divided into five transverse 

 segments »and a short terminal segment ; the lateral lobes are 

 marked by four coalesced segments, indicating the continua- 

 tion of the anterior segments of the median lobe ; although 

 broken by the smooth border, the segments may be traced into 

 the four anterior of the six spines of the outer margin. Sur- 

 face granulose under a strong magnifier. 



A comparison with Olenoides quadriceps and 0. Wasatchensis 

 (Bull. 30, U. S. Greol. Survey) shows a marked resemblance in 

 the pygidige, but, in the head certain differences occur, such as 

 the narrower glabella and the wider furrow between the glabella 

 and frontal rim of 0. Fordi. 



The species referred to this genus from the American Cam- 

 brian strata are : 0. Nevadensis (the type), 0. Marcoui, 0. 

 quadriceps, 0. Wasatchensis and 0. Forcli. In Bulletin 30, U. 

 S. Geol. Survey, I referred 0. lypicalis, OJ flagricaudus, 0. 

 levis and 0. spinosus to Olenoides, out since obtaining a nearly 

 perfect specimen of Olenoides, closely related to the type 

 species, I am convinced that the last mentioned four species 

 belong to an as yet undescribed genus. This genus will be 

 characterized in a future paper. 



0. Fordi occurs in the lowest horizon of the Taconic slaty 

 series now known to me, and is associated with Olenellus asa- 

 phoides, Microdiscus connexus, Linnarssonia Granvillensis, etc. 



