78 SAN DIEGO SOCIETY OP NATURAL HISTORY 



RAYMOND (Percy E)— Continued 



ward; free cheeks, rather wide, smooth, with short spines at the genal angles; pygi- 

 dium small, with few traces of segmentation; convex; no border. 



The author also includes Plcthopcltis armatus (Billings) described luider Bathyurus 

 by Billings in 1860. 



Family uncertain. 



Goniurus nov. Type Bathyurus perspicator Billings, 1865. 



Type diagnosis for this genus includes Trilobites, in which the facial suture, as in 

 Bathyurus, except that the fixed cheek extends a little farther towards the genal 

 angle; eyes very long, narrow and close to the glabella; glabella long, reaching al- 

 most to the frontal margin, tapering rapidly in front of the eyes; neck furrow sharp, 

 extending across fixed and free cheeks; genal angles with short, sharp spines; a nar- 

 row, elevated rim extends around the whole cephalon, and the cephalon is slightly 

 nasute in front; pygidium convex, trianguHr, with a long terminal spine. 



Goniurus perspicator (Billings), G. caudatus (Billings), G. eloni;atus n. sp. 



Matthew, Trans. Roy. Soc. Canada, vol., 1895, p. 269, referred to Bathyurus caudatus 

 Billings, as a possible species of this genus Holasaphus; but the pygidium has no furrow 

 within the border. 



Genus Lloydia Vogdes, 1890. 



This genus was proposed by Vogdes in Ball. l". S. Cxeol. Sur., No. 63, p. 97, for 

 Bathyurus hituherculatus Billings, in honor of the first author on Trilobites. 



Edward Lloyd published in Philosophical Trans., vol. 20, No. 243, p. 279, 1698, the 

 first description of Trilobites. 



Dr. Billings, in the Canadian Naturalist and Geologist, vol. 5, 1860, p. 317, provision- 

 ally refers to his genus Bathyurus, two species of fossils from Point Levi as Bathyurus 

 duhius and B. hituherculatus figs. 21 and 22. The second species, which is repre- 

 sented by a rough woodcvit, presents a glabella, somewhat tumid and extending to 

 the front margin, with basal lobes elongated, oval and pointed at both ends, separated 

 from the glabella by shallow, obscure grooves; eyes opposite the mid-length of the 

 glabella. 



Raymond places the first species of Bathyurus in the family Dikelocephalidae, under 

 a new genus Plalycolpus hubius, and gives the following diagnosis of Lloydia Vogdes. 



Whole animal oblong in outline; cephalon and pygidium regularly rounded, with ele- 

 vated convex borders; cephalon convex; glabella usually tapering towards the front and 

 reaching to the marginal border; glabella outlined by shallow or deep dorsal furrows; 

 eyes small, near the dorsal furrows, and situated halfway to the front; facial sutures 

 cut the posterior margin at the genal angles and the anterior margin in front of the 

 eyes; genal angles usually without spines; thorax of 9 segments, pleura deeply grooved, 

 ending in long, acute spines; pygidium with narrow axial lobe, which may have from 

 1 to 8 joints; pleural lobes smooth. The convex border which encircles the pygidium 

 is set off by a shallow furrow. 



Type Bathyurus hituherculatus Billings, which is common in the conglomerates at 

 Point Levis near St. Joseph's Church, Beekmantown age. 



The author also includes under Lloydia, Bathyurus Saffordi, which differs from the 

 type, in lacking the basal lobes on the glabella; also Bathyurus solitarius, from Hare 

 Bay, Newfoundland. Lloydia ohlongus (Billings), similar to /.. saffordi, but has 

 straight sides to the glabella instead of tapering forward. 



The author includes with doubt Lloydia strenuus Billings. 



The illustration given by Billings, Pal. Fossils of Canada, p. 204, fig. 188, compares 

 well with the type of Bathyurus. 



Dr. Raymond places two species described by Billings as Bathyurus quadratus and 

 breviceps, under a new genus Leiostegium, with the following diagnosis: General 



