124 The Ottawa Naturalist. [January 



cephalon suggests a form more or less similar to that of Amphilichas. 

 However, this fragment of a glabella was not actually found attached 

 to any specimen which could be identified confidently as Amphilichas 

 harrisi. 



The species originally described by S. A. Miller (Jour. Cincin- 

 nati Soc. Nat. HisC vol. I, 1878, p. 106, pi. 3, fig. 9) as Lichas 

 harrisi is a typical Amphilichas, a genus characterized by a pygidium 

 in which the axial lobe anteriorly is marked by two transverse rings, 

 while posteriorly it terminates in a point; there are three pairs of 

 pleural segments with free ends. The lateral lobes of the glabella not 

 only reach the neck furrow but are extended along the latter for some 

 distance. Lichas halli, Foerste, and the pygidium recently figured by 

 the writer from the Richmond formation at Richmond, Indiana 

 (Jour. Cincinnati Soc. Nat. Hist., vol. 22, No. 2, 1917, page 43, pi. 1, 

 fig. 2) evidently belongs to another genus, possibly Arctinurus. 



The specimens of Calymene occurring in the cherty Richmond 

 are not sufficiently well preserved to be referred to any definite species, 

 although fragments are not uncommon. 



Two figures of cephalons of trilobites are here presented in the 

 hope that they may prove of interest, although not belonging to the 

 fauna here under discussion. They serve at least to fill spaces which 

 otherwise would have been left vacant on the plate. Synhomalonotiis 

 christyi (Hall), Fig. 29, from the upper part of'the Waynesville mem- 

 ber of the Richmond, is represented by a slightly crushed cephalon. 

 Pterygometopus carleyi (Meek), Fig. 30, is represented by an entire 

 enrolled specimen, lacking only the genal spines; but only the cephalon 

 and the outline of the axial part of the first segment of the thorax is 

 here presented. It was obtained in the Fairmount member of the 

 Maysville group, at Cincinnati, Ohio. 



Bollia permarginata, sp. nov., Figs. 33 A, B, C. Carapace 

 only three-fourths of a millimeter in length, closely resembling the 

 specimen from the Arnheim member of the Richmond identified by 

 Ulrich and Bassler (New American Paleozoic Ostracoda, Proc. U.S. 

 Nat. Mus., 1908, p. 288, fig. 13) as Bollia regularis (Emmons). It 

 differs chiefly in the prominence and continuity of the ventral part of 

 the marginal ridge. The two middle ridges are slightly more elevated 

 than the anterior and posterior branches of the marginal ridge, and 

 are connected at the base so as to produce a more or less U-shaped 

 aspect. They vary from vertical to slightly divergent, with the basal 

 part inclining slightly toward the rear, especially in case of the anterior 

 one of this pair. The anterior branch of the marginal ridge tends to 

 be vertical, and as far separated from the anterior one of the middle 

 pair as the latter are separated from each other. It is located at a 

 distinct interval from the anterior margin of the carapace. The 

 posterior branch of the marginal ridge, however, is marginal, and tends 



