82 SAN DIEGO SOCIETY OP NATURAL HISTORY 



RAYMOND (Percy E)— Continued 



species of this family show distinct traces of facial sutures, particularly of the part 

 behind the ejes. He gives a figure of the head of a young species of Elli/>tocef'hala 

 asaplioides Emmons. 



In regard to the placing of Calymmenldae, Dr. Ra\innnd follows that of Beecher 

 and places it in the Order Proparia, because the post ocular portion of the facial 

 sutures cut the genal angles in Pharostoma and the genal spines are borne bv the 

 fixed cheeks. The free cheeks are decidedly Proparian. 



and Barton (Donald ('.) A revision of American species of 



Ceraurns. 



Bull. Mus. Comp. Zoology, vol. LIV, No. 20, 1913. 



The authors state that the genus Ceraurus was proposed in 1832 by Green, for a 

 new T'rilobite which he describes as Ceraurus pleurexantlicinus. and refer to Green's 

 Monograph, 1832, p. 83. 



The original description of tliis genus was first published in The Monthly Journal 

 of Geology, June, 1832, p. 560, fig. 10, republished in tlie monograph. 



Although the authors do not quote Corda. they take Reed's classification of Cheirurus 

 into two groups on the form of the pygidae. The first with cyrtometopian pygidium 

 like Ceraurus Green. The second like Cheirurus insii^nis type of pygidium with 3 

 pairs of subequal pleural spines and a short median spine. 



The American species they class as follows: 



Ceraturus hispinosus sp. nov. 



Glabella or occipital segment strongly spinose with a pair of short, horn-like spines 

 on the crest of the frontal lobe. 



Ceraurus numifor Billings. A single medium spine on the neck segment. 



Cerauruf mismeri Foerste. CJlabella expanding rapidly forward. (lenal angles with 

 spines. 



Ceraurus liudoson't Raymond. Glabella expanding forward; eyes more than one- 

 half the length of the head; a small form glabella expansion T in 4. 



Ceraurus pleurexanthemus Green. A medium-sized glabella expansion 1 in 7. 



2. Ceraurus milleranus M. & G. Eyes one-half the length of the head from tlie 

 posterior margin. 



3. Ceraurus Jnitatus n. sp. Eyes less than one-half tlie length of the head from the 

 posterior margin. 



Ceraurus granulosus sp. noi' Glabella with parallel sides. 



The autliors note in tlie Trenton fossils of Ceraurus pleurexanthemus CJreen, from 

 the typical locality, that the pvgidium \aries on the posterior border with either 

 aspinose and rounded border or with 2, 1- or 5 short spines or denticles. 



The Ceraurus Jenfafus sp. nov. 



The authors refer to Hall's C. pleurexanthemus, Pal. N. Y., vol. 1, p. 1847, pi. 65, figs. 

 Id, Ih, li, and pi. 66, figs, la-lg. 



The Ceraurus i^ranulosus sp. nov. is the C. pompiiius Raymond, 7th Report, tieol. 

 Vermont. 



The Ceraurus Milleranus M. & G. is tlie Cnlymmenc hucklanJi. .'\nthon\-, 1839. (I 

 would suggest the older name.) 



The authors refer Ceraurus rarus \\'alcotf to Em rinurus Ceraurus pustulosa Hall to 

 Eoharpes. 



To conform witli the authors' reclassification, the authors remark that besides the 

 species noted, that Vogdes' Catalogue, made in the year 1893, contains a number of 

 other species, which do not belong to the genus as now restricted, as follows: 



Cheirurus apolln Billings, to the genus Anacheirurus. Cheirurus glaueus, C. satyrus 

 and C. perforator Billings, belong to Nieszkowskia (Schmidt subgenus of 1881). 



