76 SAN DIEGO SOCIETY OF NATURAL TIISTORY 
RAYMOND (Percy E)—Continued 
in the thorax, as it is not possible to tell where the pygidium begins. He compares the 
species with FE. offawaensis. In front of the glabella the brim of E. dentoni is nar- 
row, deeply concave, and the anterior rim is curved upward; while in EF. otfawaensis 
the brim, at the front, is wide and nearly flat. 
The author also describes and illustrates Bumastus billingis R. & N. Holasaphus 
moorei Matthew. Pseudosphaerexochus apollo Billings, to which he refers the Am- 
phion cayleyi Billings and Ceratocephala goniata Warder, 
VI. Description of some new Asaphidae. 
The author includes under the genus Hemigyraspis, a specimen figured in 
Trans. Roy. Soc. Canada, vol. V, pl. 3, fig. 7, for a form similar to dsaphellus planus 
Matthew, which the author now refers to Hemigyraspis meconnelli sp. nov. Includ- 
ing under the genus this species, also dsaphellus planus Matthew and Hemigyraspis 
collteana Raymond, 1910. 
The author used as a type for his subgenus Hemigyraspis, dsaphus affinis McCoy, 
as described by Salter, Mong. Brit. Tril., pl. 24, figs. 13-14, p. 164, and included 
Oxgygia desiderata Barr. Niobe menapicensis Wicks and N. solvensis Hicks with the 
above species. 
Under Basilicus Barrandi Hall, the author remarks that this species has evaded the 
eyes of the describers of ‘Trilobites, and it was not until recently that the writer's 
curiosity to know what form it was which Vogdes referred to Ogygia (Catalogue of 
Trilobites, p. 324) caused him to unearth it. 
Raymond places as syn. to Hall’s species Asaphus wisconsensis and romingeri Wal- 
cott, 1879. Ptychopyge ulrichi Clarke, and Basilicus romingeri R. & N. 
Under the Genus Ogygites Tromelin and Lebesconte, 1875. 
The author describes and illustrates Ogygites canadensis Chapman, referring as syn. 
Asaphus halli and hinksiit, and comparing Asaphus latimarginatus Hall, with the 
species. 
The author describes as new Isotelus latus, differing from I, gigas in having all its parts 
much wider. 
Raymond remarks, that the Museum contains a number of specimens of Isotelus 
from St. Joseph Island, from which Stokes in 1823 figured a specimen as Asaphus 
platycephalus, which compares well with DelKay’s /. gigas of 1824, and advocates the 
dropping of DeKay’s species. 
The following authors use platycephalus Stokes, in preference to DeKay’s name of 
I, gigas: Bronn in 1835, Buckland in 1840, Burmeister in 1843, Roemer in 1851-56, 
Nieszkowski in 1857, Billings in 1863, and Vogdes in 1893. I think due credit should 
be given to Stokes and eliminate gigas. 
The author also describes and illustrates Isotelus maximus Locke, and Brachyaspis 
altilis Raymond, the Asaphus platycephalus Billings. (Catalogue of Silurian Fossils of 
Anticosti, p. 26, fig. 9b.) 
VIII. A revision of the species which have been referred to the genus Bathyurus. 
The author states that Billings erected the genus Bathyurus with dsaphus extans 
Hall, for the type, and described many species under it. Some 50 species have been 
referred to this genus; but in the revision the author only includes twelve, including 
three new species. 
Under the Family Bathyuridae Walcott, the author gives a revised generic descrip- 
tion and describes the following species: 
Bathyurus extans Hall, B. perplexus Billing, probably a synonym of B. extans, Bathy- 
urus johnstoni sp. nov. closely allied to B. extans. Bathyurus sp, intermediate between’ 
B. extans and B, superbus. Bathyurus superbus Raymond. ‘This species attains a 
larger size than any other known Bathyurus. B. longispinus Walcott, B. amplimar- 
