.II.olilTRS. 



Knrrlnuru* orll , 



i;i s cRISTATi ~. n' sp. 



There is a portion of a small cranidium fnmi the hori/on of the Hudson River 

 ;it Spring Valley, Minnesota, which presents a series of striking characters, 

 ;m<l in th al>-*3nce of negative evidence may provisionally be regarded as a new 



Fig. 68. Cranicliiiiii f l-:crinuru* rrmtntuji. x 3. 



The glabella is obconical, its narrow, blunt extremity being directed posteri- 

 orly and conspicuously elevated. It extends almost if not quite to the occipital margin, 

 over-hanging the posterior edge. The dorsal furrows are very deep and constrict 

 the glabella laterally. The glabellar furrows are represented by three deep puix-t.e 

 at the bottom of the dorsal furrows, and these afford evidence of four pairs of lateral 

 lobes; the first very small on the margin and limited by a faint groove extending 

 up wan! over the surface of the glabella; the second and third also narrow and linear, 

 are immediately merged into the median lobe, while the fourth pair is better 

 developed than the rest, extends entirely across the dorsal furrows, connecting the 

 eye-node with the anterior extremity of the glabella. 



The glabella bears upon its upper surface a few (25) coarse, distant tubercles, 

 which on the posterior portion are elongated, directed obliquely backward and 

 upward, and take on the form of blunt spinules. From the middle point on the 

 anterior margin of the glabella diverges a pair of shallow grooves, which skirt the 

 ante-lateral margins and become obsolete on the lateral slopes. These grooves, 

 which apparently indicate the course of the facial sutures on their anterior limbs, 

 rut off a narrow ridge on each side of the anterior margin and each of these ridges 

 bears a single row of four strong spiniform tubercles. The lateral and posterior 

 concave slopes of the glabella are smooth. The length of this glabella is 5 mm. 



A portion of the left eye-node is retains 1 and appears to have been moderately 

 elevated though not to the bight of the glabella; the eyes were approximate and 

 posterior. Among the Russian species of Encrinnrus described l>y Schmidt, we find 

 lose ally to /.'. / -i-<f'itns in hi* /-.'. wlnH-hi, from the Wesenberg hori/mi I"/-. 

 dt.. \>\. xiv. figs. 16 26). In the latter the glaliella i> less convex and more abund- 

 antly tubercled; but the posterior tubercles are equally spiniform. ami tin- anterior 

 row is clearly delimited though not divided in the center. 



