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MOLLDSCA. 



No. 539. Ancyloceras Andouli, Astier. 



The Ancyloceras was like an Ammonite partly unrolled, having its inner 

 whorls not touching and the outer one produced at a tangent and bent back again. 

 From the Lower Greensand, Cheiron, France. Size, 13 x 6. Price, $1.50. 



No. 540. Ancyloceras Emerici, D'Orb. 



Portion lacking outer whorl. From the Upper Neocomian (Cretaceous), 

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

 Rochester. Size, 7x9. Price, $1.75. 



No. 541. Ancyloceras gigas, Sow. 



This magnificent and per- 

 fect specimen (called by Sower- 

 by, Scaphites gigas,) is from the 

 Lower Greensand (Cretaceous), 

 Atherfield, Isle of Wight, and 

 is now in the private Geologi- 

 cal Cabinet of Mr. Ward, 

 Rochester. 



Size, 18 x 12. Price, $3.50. 



No. 542. Ancyloceras spinigenim, Sow. 



Woodward gives this species as the type of the genus. From the Gault 

 (Lower Cretaceous), Folkestone, England, and now in the private Geological 

 Cabinet of Mr. Ward, Rochester. Price, $0.75. 



No. 543. Ancyloceras Tabarelli, Astier. 



From the Upper Neocomian (Lower Cretaceous), Barreme, France, and now 

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



No. 544. Aptychus ^ Meyer. 



The Aptychi (Trigonettites, Park,) were described 

 by Meyer as bivalve shells and by Deslongchamps 

 under the name of Munsteria. D'Orbigny and Pictet 

 regard them as Cirripedes. Deshayes considers them 

 as the gizzards of Ammonites; Coquand compares them 

 with Teudopsis; Ruppell, Voltz, Quenstedt, and 

 Zieten, regard them as the opercula of Ammonites. 

 Woodward and the majority of English Geologists are of this last opinion, 

 specimens having occasionally occurred in which the aperture of the shell was 

 closed by the Aptychus. This specimen consists of two pairs, showing both sides. 

 From the Lithographic limestone (Middle Oolite), Solenhofen, Bavaria. 



Price, $0.60. 

 No. 545. Aptychns lamellosus, Meyer. 



The inner surface of this species is marked by longitudinal striae. The 

 original specimen, from the Lithographic Limestone (Middle Oolite), of Solenho- 

 fen, Bavaria, is in the Ward Museum in the University of Rochester. Price, $0.40. 



