114 SAN DIEGO SOCIETY OF NATURAL HISTORY 
ULRICH (E. O.) and BASSLER (Ray S.)—Continued 
Thilipsura multipunctata n. sp. Octonaria angulata n. sp., O. inequalis 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 robusta n. sp., C. oblonga n. sp. 
Bythocypris punctatulata var. arctatum n. var. Pontocypris arcuata n. sp. P. mawit 
var. breviata 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 Acidaspis, on p. 55, as a similar genus. 
The author quotes Barrande, Vogdes and Clarke on the family and gives figures 
of Odontopleura ovata, Selenopeltis Buchi, Ceratocephala prevosti and C, Danai, 
Dicranurus humatus and Acidaspis Brighti in the text. The author describes seven 
species from the Niagaran limestone of St. Clair Springs. 
Odontopleura Ortonti Foerste, O. arkansana noy. with fig. in text. 
Ceratocephala gonita Warder (depauperata), C. nodulata nov., fig. of head in text, 
C. coalescens, fig. glabella in text. 
Acidaspis quinquespinosa 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The unpublished plates of Acidaspis Salter and Fletcher (two plates), the second 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 quinquespinosus 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., pl. 7, fig. 4. 
Acidaspis obsoleta nov., figs. 13 and 14 in text. 
Ampyx niagarenis nov., fig. 15 in text, compares 4. parvulus Forbes, differs in its 
longer and narrower glabella, and less tumid cheeks. 
Proetus corrugatus nov., figs. 16-17 in text, head and tail; P. subanulatus nov., fig. 18 
in text, tail. 
Arges phyctenoides Green, depauperatus. 
The author uses the preoccupied term Arges referred by Gurich to Ceratages. 
Van Ingen places Lichias Hanovensis Miller and Gurley and L. Byrneansus M. & G. 
as syn. to Green’s species. 
Arges arkansanus nov., fig. 19 in text, head compares Lichas Grayt Fletcher. Lichas 
nereus Hall. 
Encrinurus punctatus Wahl., refers E. ornatus H. & W., to this. 
Dalmanites (Synphoria) 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 Phacops Brongniartii Portlock, which has been referred to the 
subgenus Pterygometopus. 
