76 RAN DIEGO SOCIETY OF NATUllAE HISTORY 



RAYM OND (Percy E)— Continued 



in the thorax, as it is not possible to tell where the pygidium begins. He compares the 

 species with E. ottaivac/isis. In front of the glabella the brim of E. detitoni is nar- 

 row, deeply concave, and ilie anterior rim is cur\'etl upward; while in E. nlta^vat'iisis 

 the brim, at the front, is wide and nearly tlat. 



The author also describes and illustrates Bumastus /iilliiii;is R. & N. Hola.uip/ius 

 moore'i Matthew. Pseudosphaerfxui litis npollo Billi/igs, to wiiich he refers the .7///- 

 p/iion cayleyi Billings and Cerntoceplialn goniola W^arder. 



VI. Description of sonie new Asaphidae. 



The author includes under the genus Hemigyraspis, a specimen figured in 

 Trans. Roy. Soc. Canada, vol. V, pi. 3, i\^. 7, for a form similar to .Isaphelhis planus 

 Matthew, which the author now refers to Ilemigyro.sp'is mcro/i/irlli sp. nov. Includ- 

 ing under the genus this species, also J saplicV.tis planus Matthew and Ilrmigyraspis 

 coUleana Raymond, 1910. 



The author used as a type for his subgenus Hemigyraspis, Asaplius affinis McCoy, 

 as described by Salter, Mong. Brit. Tril., pi. 2-1, figs. 13-14, p. 164, and included 

 Ogygia desidt'ialrt Barr. Niohe mennpicensis Hicks and A', salvensis 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 \'ogdes referred to Ogygia (Catalogue of 

 Trilobites, p. 324) caused him to unearth it. 



Raymond places as syn. to Hall's species Asaplius vjisrorisensis and romingeri \\a\- 

 cott, 1879. Ptychopyge ulriclii Clarke, and Basilic us romingeri R. k N. 



Under the Cjenus Ogygites Tromelin and Lebesconte, 1875. 



The author describes and illustrates Ogygites canadensis Chapman, referring as syn. 

 Asaplius lialli and liinksii, and comparing Asaplius lalimarginatus Hall, with the 

 species. 



The author describes as new Iso/elus latus, differing from /. 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 1S23 figured a specimen as ylsaplius 

 platycephalus, which compares well with DeKa>'s /. gigas of 1824, and advocates the 

 dropping of DeKay's species. 



The following authors use platycephalus Stokes, in preference to I)eKa\'s name of 

 /. gigas: Bronn in 1835, Buckland in 184(), Burineister 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 maximtis Locke, and Bracliyaspis 

 eltilis Raymond, the Asaplius 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 Bath\urus. 



The author states that Billings erectet! the genus Bathyurus with Asaplius extans 

 Hall, for the type, and described many species luider 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 Bathyuritlae ^^'alcott, the author gives a revised generic descrip- 

 tion and describes the following species: 



Bathyurus extans Hall, B. perplrxus Billing, probably a synon\m of B. extans, Bathy- 

 urus johnstoni sp. nov. closely allied to B. extans. Bathyurus sp. intermediate between 

 B. extans and B. superhus. Bathyurus superhus Raymond. This species attains a 

 larger size than any other known Bathyurus. B. longispinus Walcott, B. am plimar- 



