402 The Ohio Journal of Science [Vol. XIX, No. 1, 



Dalmanites cf. verrucosus Hall. 



Plate XVIII, Fig. .5. 



In the Cedarville dolomite at Cedarville, Ohio, a cephalon 

 was found which bears a close resemblance to Dalmanites 

 verrucosus Hall, from the Waldron shale of Indiana. The 

 Cedarville specimen is a cast of the interior of the test. 



There is no evidence of tuberculation. The broad prolongation of 

 the median part of the anterior border of the cephalon is a little narrower 

 than in the Waldron species. The anterior pair of glabellar lobes is 

 broad, so that the posterior margin of the frontal lobe is not sharply 

 defined. Neither the second nor the third pairs of glabellar furrows 

 reach the dorsal grooves, differing apparently in this respect from the 

 Waldron species. Some of the associated pygidia are strongly tubercu- 

 lated, but there is a possibility of the cephalon here figured being a new 

 species. 



Acrolichas Gen. nov. 



Cranidia as in the European genus Amphilichas. Pygidia differing 

 as follows: Three pairs of ribs, all with free tips; axial lobe narrowing 

 posteriorly to an acute point which reaches the notch between the free 

 tips of the posterior pair of ribs. Genotype : Lichas cucullus Meek and 

 Worthen, from the Kimmswick limestone of Illinois and Missouri. 

 (Geol. Surv. Illinois, 3, 18G8, p. 299, PI. I, Figs. 6, a, b, c; cranidium 

 only.) 



EXPLANATION OF PLATES. 



Pi ATE XVT. 



Fig. 1. Schuchertella prosscri Focrstc. A. brachial valve of a very convex 

 elongate form; B, pedicel valve of a less elongate form; C, profile of 

 specimen A; D, profile of specimen B, joined with that of a brachial 

 valve of ordinary convexity; E, cast of interior of pedicel valve, showing 

 cast of muscular area. Bisher member, from the hill-front northwest 

 of Bisher dam bridge, southeast of Hillsboro, Ohio. 



Fig. 2. Stropheodonta {Brachyprion) plana Foerste. A. cast of interior of pedicel 

 valve; B. profile of same. Bisher member; on James Sanderson farm, 

 north of Danville, Ohio. 



Fig. 3. Rhynchotreta americona Hall. A. brachial valve; B, lateral view. From 

 the Bisher member, in the southeastern part of Hillsboro, Ohio. 



Fig. 4. Atrypa reticularis elongata Foerste. A, pedicel valve; B, brachial side; 

 C, lateral view. From Bisher member, in southeastern part of Hillsboro, 

 Ohio. 



Fig. 5. Bumastjis cf. ioxus (Hall). Cranidium, from Bisher member, in south- 

 eastern part of Hillsboro, Ohio. 



Fig. 6. Whitfieldella cylindrica (Hall). A, brachial side; B, lateral view. From 

 Bisher member, on James Sanderson farm, north of Danville, Ohio. 



Fig. 7. Spirifer niagarensis (Conrad). A, pedicel valve; B. Ijrachial valve. 

 From the Bisher member, on the James Sanderson farm, north of Hills- 

 boro, Ohio. 



