80 SAN DIEGO SOCIETY OF NATURAL HISTORY 
RAYMO ND ( Percy E)—Co ntinued 
= 
B. A group of species, in which the second segment of the thorax is in no way 
distinguishable from the others. To this group belong the Scandinavian, British and 
American forms. 
The author remarks that Paradoxides Harlani, differs from other species and one 
which makes it almost unique, in the wide, depressed brim at the anterior end of the 
cranidium. 
New and old Silurian Trilobites from S. E. Wisconsin, with 
notes on the genera of Tllaenidae. 
Bull Mus. Comp. Zool., vol. 60, 1916, No. 1. 
The author divides the Illaenoidae into two sections: 
I. Illaenoidae. 
Genera Illaenus, Thaleops, Dysplanus, Wossekia gen. nov. and Octillaenus, Bumas- 
tinae, Genera Bumastus, Actinolobus, Illaenoides. 
Under Bumatus the author includes descriptions of the following species: 
Bumastus cuniculus Hall, B. Niagarensis Whitf., B. Dayi nov., B. decipiens nov., 
B, tenuis nov., B. insignis Hall, B. ioxus, B. graftonensis. 
M. & W. & B. indeterminatus Walc. 
Under Eichwald’s genus <Actinolobus, he refers a single pygidium as Actinolobus 
Americanus from Racine Dolomite. 
Il. Lichadidae—The author refers Weller’s Dicranopeltis nasuta to Trochurus nasuta. 
Odontopleuridae—Ceratocephala goniata Warder, 1838. 
Encrinuridae—Encrinurus reflexus noy. 
The author refers to a new species a pygidium of large size, with 8 pairs of ribs 
on the lateral lobes, which he compares with other American species. 
Calymmenidae—The author enumerates the following species: 
Calymmene Niagarensis Hall, C. breviceps noy. for Hall’s C. Niagarensis, 28th Rep. 
N. Y. State Cab. Nat. Hist., pl. 32, fig. 7-15. 
Calymmene celebra nov. for Hall’s C, Niagarensis, 20th Rep. N. Y. State Cab. Nat. 
Hist., p. 334, based on the pygidium which has 4 pairs of narrow ribs without im- 
passed line, that reach only one-half way to the margin. New genus Liocalymene, with 
Vauxem’s species Hemicrypturus Clintoni for its genotype. This form has a smooth 
pygidium without ribs and a jointed axis, from the Clinton of New York. 
This genus should include the French and Spanish Silurian form described as 
Calymmene Aragoi by Rouault, which differs from C. Salteri described by the same 
author in having 10-11 joints on the axis, and C. Arago only 7. 
Cheirurus Niagarenis Hall. The author restricts this species to Hall’s species from 
Rochester, Pal. N. Y., vol. 2, p. 303, pl. 67, figs. 9-10. 
Raymond refers the Ceraurus insignis Hall, Pal. N. Y., vol. 2, 1852, p. 300, pl. 6a, 
fig. 4, to Cheirurus Welleri nov. Also included Roemer’s C. bimucronata Sil. Fauna, 
Tenn., p. 80, pl. 5, fig. 19, and Hall’s C. Niagarensis, 20 Rep. N. Y. State Cab. Nat. 
Hist., pl. 21, figs. 10-11, and others. 
Cheirurus dilatatus nov. for Hall’s Sphaerexochus Romingeri? 28 Rep. N. Y. State 
Mus. Nat. Hist., 1877, pl. 32, fig. 16. 
Cheirurus patens nov., C. Tarquinius Bill., C. Hydei Weller, and C. nuperus Bill. 
The type of this species was lost and no further specimens have been described. 
Sphaerexochus Romingeri Hall. The author remarks that the pygidium of this 
species is rare and, usually incorrectly figured. The pygidium is entire, and the spine~ 
figured by Hall are the ribs on the pleural lobes. 
Beecher’s classification of Trilobites after twenty years. 
Am. Jour. Sci., ser. 4, vol. 43, 1917, p. 196-210. 
