CRUSTACEA. 



99 



No. 382. Asaphus tyranrms, MurcHson, 



This species, one of the largest known, is peculiarly 

 British, and is even restricted to Wales and the border 

 counties. It is readily distinguished from the A. gigas by 

 its more expanded form and strongly furrowed pygidium. 

 The tail is longer and more convex than the head. It is 

 the most highly ornamented of the AsapMdce. This speci- 

 men (with parts of the cephalic and caudal shields re- 

 stored) was found in the Llandeilo Flags (Lower Silurian), 

 at Bishop's Castle, Wales. Size, 10 x 6. Price, $1.50. 



No. 383. Asaphus Barrandi, Hall. 



This specimen, the tail of which is wanting, shows the hypostoma through a 

 fracture in the cephalic shield. From the Trenton Limestone (Lower Silurian), 

 Platteville, Wisconsin. Size, 7x6. Price, $1.75. 



No. 384. Asaphus Barrandi, Hall. 



From the same locality as the preceding. 



Size, 6 x 5. Price, $1.25' 



No. 385. Amphion Fischeri, Eichwald. 



This genus approaches the Calymene, but is distinguished by its nearly rec- 

 tangxdar glabella and by its numerous (from 15 to 18) body-rings. This specimen, 

 representing the animal coiled up, is from the Lower Silurian at Pulkowa, near 

 St. Petersburg, Russia, Price, $0.20. 



No. 386. Acidaspis Buchii, Barr. 



This Trilobite is distinguished generically by its eight small 

 but strongly arched body-rings, and by the surface being cov- 

 ered regularly with tubercules. This specimen is from the 

 Lower Silurian slate at Beraun, Bohemia. Price, $0.80. 



No. 387. Acidaspis mira, Beyrich. 



From the Upper Silurian at St. Iran, Bohemia. 



Price, $0.50. 



No. 388. Angelina ( Ogygia ) Sedgwicki, McCoy. 



From the Lower Silurian at Garth, North Wales. Original in the private 

 Geological Cabinet of Mr. Ward, Rochester. Price, $0.50* 



No. 389. Bathynotus holopygia, Hall. 



This new Trilobite has a semi-elliptical cephalic shield with spiny processes, 

 prominent glabella, eleven articulations in the thorax, and a distinct, semi-oval 

 pygidium. The specimen, which is an impression of the animal from which 

 most of the shell has been removed, is from the Quebec group (Lower Silurian), 

 Georgia, Vermont. p rice) $q.50. 



