114 SAN DIEGO SOCIETY OP NATURAL HISTORY 



U LRICH (E. O.) and BASSLER (Ray S.)— Con tinued 



Tliilipsura mitltipinntata ii. sp. Octoiiaria angiilala n. sp., 0. incquaits n. sp., O. 

 simplex Krause, 1891. 



Craterellina n. gen. 



The most obvious characteristic of the genus is the presence of a crater-like depres- 

 sion, bordered by a more or less distinctly elevated rim, occupying the anterior one- 

 third or one-half of each valve. 



Craterellina rohusia n. sp., C. ohloui^a n. sp. 



Bytliocypris punctatulata var. arctatum n. var. Ponlocypris arruata n. sp., P. ina^vii 

 var. hre-viata Jones, 1889, and Pachydomella longula n. sp. 



Van Ingen (Gilbert). The Silurian fauna near Batesville, Arkansas. 



School of Mines Quart., vol. 23, 1901. No. 1. 



The author refers to certain plates which were not issued with the publication. 



The author remarks on the family Acidaspidae Barr. (used for the xii family, with- 

 out a family name), that this term is used in preference to Odontopleuridae of Bur- 

 meister (used by this author for a family name), which latter name had more re- 

 cently been suggested by Etheridge and Mitchell in 1897, inasmuch as the genus 

 Acidaspis Murch. (January, 1839,) and Emmrich's name Odontopleura (1839) is of 

 later date. There was no date of publication given on Emmrich's De. Trib. Dis- 

 sertates. 



The author refers to Murchison's Acidaspif, on p. 55, as a similar genus. 



The author quotes Barrande, ^'ogdes and Clarke on the family and gives figures 

 of Odontopleura ovata, Selenopeltis Buclii, Ceratocephala prevosti and C. Danai, 

 Dicranitrus hiimatus and Acidaspis Brigliti in the text. The author describes seven 

 species from the Niagaran limestone of St. Clair Springs. 



Odontopleura Ortonti Foerste, O. arkansana nov. with fig. in text. 



Ceratocephala gonita Warder (depauperata) , C. nodulata nov., fig. of head in text, 

 C. coalescens, fig. glabella in text. 



Acidaspis auinquespinosa Salter MS., fig. 12 head in text. 



The unpublished plates of Acidaspis Salter and Fletcher (two plates), the second 

 one (figs. 10-12) of Acidaspis qninrjuespinnsus nov. of a small head with spined 

 occipital ring, and an entire specimen (fig. 12) with a median node to the occipital 

 ring. Van Inger's figure is more in keeping with Lake's fig., pi. 7, fig. 4. 



Acidaspis ohsoleta nov., figs. 13 and 14 in text. 



Ampyx ningarenis nov., fig. 15 in text, compares A. parvulus Forbes, differs in its 

 longer and narrower glabella, and less tumid cheeks. 



Proctus corrugatus nov., figs. 16-17 in text, head and tail; P. subanulatus nov., fig. 18 

 in text, tail. 



Arges phyctenoides Cireen, depauperatus. 



The author uses the preoccupied term Arges referred by Ourich to Ceratages. 



Van Ingen places Lichias Hanovensis Miller and Gurley and L. Byrneansus M. & G. 

 as syn. to Green's species. 



Arges arkansauus nov., fig. 19 in text, head compares Liclias Grayi Fletcher. Liclias 

 nereus Hall. 



Encrinurus punctatus Wahl., refers E. ornatus H. & W., to this. 



Dalmanites (Synp/ioria) viglans Hall, D. (Synphoria) arkansanus nov., figs. 20-22, 

 heads and tail, broad and narrow forms. 



These forms differ in the well-marked triangular outline of both cephalon and the 

 frontal glabellar lobe, of the American Ordovician and Silurian species. Their near- 

 est ally appears to be Pliacops Brongniartii Portlock, which has been, referred to the 

 subgenus Pterygometopus. • 



