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AKTICULATA. 



No. 434. Olenus Tessini, Daim. 



This genus, long united to Paradoxides, is distinguished by the enlargement 

 of the caudal shield at the base, thus assuming a trilateral shape. It has four- 

 teen body-rings. This specimen is from the Lower Silurian at Horrowitz, Bohe- 

 mia. Size, 10 x 4. Price, $1.00. 



No. 435. Olenellus Vermontana, Hail. 



From the Quebec Group (Lower Silurian), Geor- 

 gia, Vt. (Tail wanting.) Price, $0.30. 



No. 436. Olenellns Thompsoni, Hall. 



From the Quebec Group (Lower Silurian), Georgia, Vermont. Price, $1.75. 



No. 437. Paradoxides Bonemicus, Bock. 



Two specimens. This genus is distinguished by a 

 broad club-shaped glabella, large head-spines, oblong eyes, 

 from 17 to 20 fiat body -rings, and a very small pygidium. 

 It includes some of the largest Trilobites known. From 

 the Lower Silurian at Ginetz, Bohemia. 



Size, 6x3. Price, $1.00. 



No. 438. Paradoxides Harlani, Green. 



This specimen, in which the tail is wanting, was found in the Quebec Group 

 (Lower Silurian), Braintree, Massachusetts. Size, 12 x 9. Price, $2.50. 



No. 439. Paradoxides Davidis, Salter. 



From the Lower Lingula Flags (Lower Silurian), St. Davids (Pembroke), 

 South Wales. Size, 11 x 9. Price, $2.00. 



No. 440. Parodoxides spinulosus, Broug. 



Body and Caudal Segments. This specimen, showing well the backward 

 prolongation of the ribs on the caudal portion, is from the Lower Silurian of 

 Skrey, Bohemia, and is now in the private Geological Cabinet of Mr. Ward, Ro- - 

 Chester. Price, $0.75 



