THE SUBGENUS CYLINDER. 83 



is always present in the species^ over the whole shell, 

 and by its somewhat compressed conical shape. 



II. Retiferi. 



C. retifer (Menke) = solidus (Sowb.). One species only. 

 Amply characterized by its pyriform outline, great 

 solidity, and coarse reticulations. Native of Eastern 

 seas. 



III. LUCIDI. 



C. lucidus (Mawe) =reticulatus (Sowb.) . The only species. 

 Very peculiar in its more conical shape, areolate and 

 regular marking, and violet aperture. The locality 

 also is curious : La Plata Island, west coast of 

 Central America. 



IV. AuLici. 



Shells, as a rule, narrow in proportion to their length ; 

 spire rounded, elevated, marking, on most of the species, 

 very bold and distinct dark chestnut or chocolate-brown 

 blotches, alternating with lines of large white spots inter- 

 laced with coarse network. 



a. crocati. 



Surface orange-yellow, often nearly suffusing the entire 

 shell. Though the type (C. crocatus) is distinct enough, 

 it is connected by intermediate gradations with the Aulici 

 proper. 



C coluhrinus (Lam.) . Yellow, with oblong white spots. 

 A very uncommon and curious species. 



C. crocatus (Lam.). A very handsome orange-yellow 

 conical species, with white spots and markings 

 broader than long, very variable in their disposition. 

 Some specimens are almost unicolorous yellow. 

 This species, at first sight, has less resemblance to 



g2 



