AM ALT A. -217 



front and acutely angulated on the right side ; ochraceous, 

 becoming blackish on the back; shield ochraceous, with blackish 

 maculations, thicker in the middle; sole ochraceous, unicolored. 



Length (in alcohol), 35 mill. 



Sardinia and Sicily. 



Said to be distinguished from all preceding species by char- 

 acters of its reproductory organs ; externally differs from A. 

 carinata by its more elevated carinu, and smaller shield granu- 

 lations. 



A. DODERLEINI, Lessona and Pollonera. PI. 53, figs. 48-50. 



Moderate!}' rugose, yellowish brown, becoming blackish on the 

 back and shield ; carina acute, blackish, pallid on the top ; back 

 obliquely sulcate with black ; shield emarginate behind, very 

 minutely granular, sulcus oval elongated, black, acutely angu- 

 lated on the right side; sole pallid, unicolored. 



Length (in alcohol), 35 mill. 



Palermo, Sicily. 

 A. HESSEI, Bottger. PI. 60, figs. 85, 80. 



Intermediate between A. marginata, Drap., and A. gagates, 

 Drap., the tail more acute than in the former, more obtuse than the 

 latter; dirty yellowish brown, the shield with a ^-shaped or 

 irregular dark marking; middle field of sole double the width of 



either side zone. Length. 19 mill. 



Epirus, Corf u. 



A. SICULA, Lessona and Pollonera. PI. 53, figs. 51, 52. 



Large, moderately rugose and carinate, yellowish brown on 

 the sides, blackish on the back and shield ; carina acute, black; 







shield posteriori}' emarginate, unicolored, sulcus subpentagonal ; 

 head and tentacles blackish ; sole pallid, unicolored. 



Length (in alcohol), 45 mill. 



Shell-plate rather thick, oval oblong, subir regular, whitish, the 



nucleus not prominent. 



Palermo, Sicily. 



A little larger than the other Italian species, it is distinguished 

 from A. gagates by its less granular shield, appearing as though 

 somewhat transversely striated, and by its shell, which has the 

 posterior fosset which Bourguignat has made a character of his 

 section Sansania. 



