CEPHALOPODA. 



1U5 



No. 232. Trigonellites (aptychus) latus, Fnvk. 



These objects were described by Meyer as bi- 

 valve shells, under the name Aptychus, and by 

 Deslongchamps under the name Munsteria. 

 d'Orbignj' and Pictet regard them as Cirripedes. 

 Deshayes considers them the gizzards of Am- 

 monites; Coquandcompares them with Teudopsis; 

 Ruppell, Voltz, Quenstedt and Zieten, regard 

 them as the opercula of Ammonites. Woodward, Owen 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. The 

 name Tri(/onellites was given by Parkinson in 1811. This specimen consists 

 of two pairs, showing both sides. From the Lithographic Limestone (Middle 

 Oolite), Solenhofen, Bavaria. 



No. 233. [550, Cast]. Crioceras 



Leveille. 



On pedestal. The original of this specimen was 

 brought by Humboldt from the Lower Cretaceous 

 at Santa Fe de Bogata, S. A. Size, 12 x 10. 



No. 234. [552, Cast]. Crioceras Duvalii, Leveille. 



This genus has all the essential char- 

 acters of the Ammonites, save that its 

 whorls are open, not touching each other 

 in the enrolling of the shell. From the 

 Lower Neocomian (Cretaceous), Escrag- 

 noUes, France. 



Size, 11 X 8. 



No. 235. [451, Cast]. Ancyloceras gigas, Sow. 



This magnificent and per- 

 fect specimen (called by 

 Sowerby Scaphites gigas), is 

 from the Lower Greensand 

 (Cretaceous), Atherfleld, Isle 

 of Wight. Size, 18 x 12. 



