CEPHALOPODA. 133 



No. 575. Nautilus semistriatus, D'Orb. 



This specimen shows the shell and the external markings from which the 

 species takes its name. From the Middle Lias, Charmouth, England, and now in 

 the private Geological Cabinet of Mr. Ward, Rochester. 



Size, 6 x 5. Price, $1.00. 



No. 576. Nautilus semistriatus, D'Orb. 



From the same locality as the preceding, and now in the private Geological 

 Cabinet of Mr. Ward, Rochester. Size, 13 x 9. Price, $2.00. 



No. 577. Nautilus semistriatus, D'Orb. 



On pedestal. This is an unusually large specimen, with an expanded, trum- 

 pet-shaped mouth. From the same locality and Cabinet as the preceding. 



Size, 15 x 10. Price, $3.25. 

 No. 578. Nautilus . 



From the Middle Lias, Charmouth, Eng., and now in the Ward Museum, 

 University of Rochester. Price, $0.75. 



No. 579. Nautilus . 



An interesting form, very slightly coiled. From the Carboniferous (?) strata 

 of Kentucky, and now in the Ward Mnseum of the University of Rochester. 



Diameter, 6. Price, $1.00. 



No. 580. Lituites UUdatUS Conrad. 



This rare and remarkable shell is a Palaeozoic ally of 

 the Nautilus, from which genus it differs mainly by the 

 complete exposure of all its whorls. From the Black 

 River limestone (Lower Silurian), Middleville, N. Y. 



Price, $0.75. 

 No. 581. Trocholites ammonius, Hall. 



This nautiloid shell is from the Black River limestone (Lower Silurian), Mid- 

 dleville, N. Y. Pricej ^ 3Q 



No. 582. Discites ornatus, Hall. 



From the Goniatite limestone (Devonian), Manlius, N. Y. 



Size, 7x5. Price, $1.00. 



No. 583. Rhyncholites G-aillardoti, Faure-Biguet. 



This species of Rhyncholite is suggested by Woodward to have been a man- 

 dible of N. arietis, Rein. Similar rhyncholites are found in all strata 

 in which Nautili occur. Schlotheim described this species as a Lepas ; 

 Blainville, as the beak(!) of aBrachiopod ; and D'Orbigny has manu- 

 factured two genera of Calamaries out of these fossils. These speci- 

 mens, four in number, are from the Muschelkalk (Trias), Bavaria. Originals in 

 the Ward Museum, University of Rochester. Price, $0.30. 



