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0. detrimcata, Chem. ; syn. 0. pera ?, Mulilf. Somewhat 

 rare. Found on stones at great depths, on Spondyhts 

 gadcro^ms, on Chama gryphoides, ancl on other bivalve 

 shells. 



0. lunifera, Phil. Found under the same circumstances 

 as the preceding. 



0. neapolitana ?, Scacchi. 



0. sp. nov. ? * 



Orthitcs fossilcs. 



0. detruncata, Gm. ; identical with the existing species. 

 Found in Bed No. ], the coralline limestone. (E. 

 Forhes). 



0. radula, t Mamo ; i broken found in the yellow sand ? 

 near the Saline. 



t Testa rotundato-transversa, depressiuscula, antice subsi- 

 nuata, longitudinaliter argute striata, striis granulato- 

 asperis, sulcis incrementalibus parallel is, transversis, 

 subimbricatis, valvula dorsali lasviter carinata. (Mamo)* 



Gcnus Thecidea, Defr. 

 T. esotica ?, Defr. 



Gcnus Crania, Retzius. 



C. ringens, Honinghause, Found in Marsarnuscetto Har- 

 bour, generally gregarious and attached to stones, at 

 depths of 14 to 50 metres. 



mollus:a pteropoda. 



Gcnus Hyalasa, Lamk. 



H. tridentata, Lamk. Rare, and found in the stomachs of 



turtles. 

 H. vaginella, Cantraine. Rare. 

 H. gibbosa, Rang. Rare. 



