GASTEROPODA. 139 



No. 617. Macrocheilus primogenius, Conrad. 



From the Coal Measures, Graysville, 111. Price, $0.20. 



No. 618. Cerithium giganteum, Lam. 



On pedestal. This genus, which abounded in Geological periods 

 from the Trias to the present time, was distributed widely then as now 

 in the seas over all parts of the globe. It had its culmination in num- 

 bers, as well as in size of individuals and variety of forms, during 

 the Tertiary Period. This magnificent specimen — the largest of all 

 fossil Gastropods — is from the Eocene Tertiary at Damery, France, 

 and now in the private Geological Cabinet of Mr. Ward, Rochester. 



Size, 22x 7. Price, $2.75. 



No. 619. Cerithium giganteum, Lam. 



From the same locality as the preceding. Size, 13x4. Price, $1.75. 



No. 620. Cerithmm giganteum, Lam. 



Internal cast. From the Eocene Tertiary, Vaugirard, France, Size, 7x3. 



Price, $1.00. 



No. 621. Cerithium cornucopise, Sow. 



From the Eocene Tertiary, Cotentin, France, and now in the Ward Mu- 

 seum, University of Rochester. Size, 8x3. Price, $1.50. 



No 622. Euomphalus pentangulatus, Sow. 



This genus, now entirely extinct, was present in con- 

 siderable numbers in the Palaeozoic seas, from the Lower 

 Silurian to the Trias. Its discoidal form, angular whorls, 

 and large umbilicus, make it a shell easily recognizable, 

 and a servicable fossil in the determination of the age of 

 strata in which it occurs. This specimen — from the Car- 

 boniferous limestone of Kildare, Ireland, — is now in the 

 private Geological Cabinet of Mr. Ward, Rochester. Price, $0.40- 



No. 623. Euomphalus cyclostomus, Hall. 



Two specimens, front and reverse. From the Hamilton group (Devonian), 

 New Buffalo, Iowa. Price, $0.30. 



No. 624. Euomphalus rugosus, Sow. 



From the Upper Silurian, Dudley, England, and in the private Geological 

 Cabinet of Mr. Ward, Rochester. Price, $0.30. 



No. 625. Euomphalus, . 



A very gibbous and slightly umbilicated form. From Carboniferous strata, 

 in Australia. Now in the Ward Museum of the University of Rochester. 



Price, $0.30. 



No. 626. Platyostoma ventricosum, Conrad. 



From the Oriskany sandstone (Devonian), Albany Co., N. Y. Price, $0.75. 



No. 627. Pleurotomaria armata, Mant. 



From the Inferior Oolite, Bayeux, France. Price, $0.50. 



