100 



AKTICULATA. 



No. 390. Bumastus (Illaemis) Barriensis, Murch. 



This genus of Trilobites is characterized by the great breadth 

 and convexity of the cephalic and caudal plates and the faint- 

 ness of the longitudinal, trilobate markings. The genus closely 

 resembles Illsenus, and this species is only distinguished from I. 

 cras&icaudti by the fact that the broad axis is not strictly sepa- 

 rated from the lateral lobes. The specimen is from the Niagara 

 Group (Upper Silurian), New York. Price, $0.75. 



No. 391. Bumastus ( Iilsenus ) Barriensis, Murch. 



This specimen, which shows well the broad expanded buckler, the ten body 

 segments, and the caudal shield, is from the Upper Silurian at Dudley, England. 



Price, $1.00. 



No. 392. Bronteus Brongniarti, Barr. 



The ten-jointed Trilobites constituting this genus, have a short articulated 

 caudal axis, and a very large circular caudal shield ; they are unable to roll them- 

 selves up. This species was found in the Upper Silurian at Tetin, Bohemia. 



Price, $0.50. 

 Ne. 393. Bronteus planus, Barr. 



From the Upper Silurian at Beraun, Bohemia. Price, $0.30. 



No. 394. Calymene Blumenbachii, Brongniart. 



This well known genus derives its name from the 

 obscurity which long hung over the real nature of 

 these crustaceans. In this species, the cephalic 

 shield is large, convex, rounded in front with a well- 

 marked border, boldly three-lobed, and having promi- 

 nent, but not very large eyes, set widely apart ; the 

 thoracic portion consists of thirteen segments ; and 

 the pygidium is small and nearly semi-circular. It 

 is often found coiled up. This specimen is from the 

 Upper Silurian at Dudley, England. The original is 

 in the Ward Museum in the University of Rochester. 



Price, $1.00. 



No. 395. Calymene Blumenbachii, Brong. 



Two specimens, coiled. From the same locality as the preceding. 



Price, $0.50. 



No. 396. Calymene senaria, Conrad. 



The most obvious distinction between this and the preceding species consists 

 in the slight but conspicuous tuberculation of the segments of the middle lobe 

 of the thorax at their extremities. This fossil is from the Lower Silurian at Cin- 

 cinnati, Ohio, and is in the Ward Museum of the University of Rochester. 



Price, $0.80. 



No. 397. Calymene leeviceps, Daim. 



This specimen ^coiled) is from the Lower Silurian at Motala, Sweden. 



Price, $0.20. 



