ENGINA. 189 



E. NODULOSA, Pease. PL 61, fig. 10. 



Shell dark chocolate, encircled by a narrow, white central 

 band ; aperture bluish white. Length, 15 mill. 



Ebon .hi., Polynesia. 

 E. CAEBONARIA, Reeve. PI. 61, figs. 11-13. 



Shell whitish , crossed by dark chocolate longitudinal tubercular 

 ribs ; aperture often salmon-colored. Length, 15-18 mill. 



Philippines (Cuming); Panama (C. B. Adams); 



Galapagos Is. (Wimmer). 



E.forticostaia, Reeve (tig. 12), and E. crocostoma, Reeve (fig. 

 13), are synonyms. 



E. ASTRICTA, Reeve. PI. 61, figs. 14, 15. 



Shell yellowish white, with low rounded longitudinal ribs, and 

 close, narrow, dark chestnut revolving riblets. Length, 15 mill. 

 Andaman Is. (E. A. Smith); Mauritius (von Martens). 



E. leqcozia, Duclos (fig. 15) appears to be identical. Ricinula 

 iostoma, Reeve (Man. II, 188, t. 58, f. 248) is also possibly a 

 synonym. 



E. ALVEOLATA, Kiener. PL 61, figs. 16-20. 



Shell longitudinally ribbed, ribs cut into tubercles by revolving 

 grooves ; yellowish white, with alternate interrupted revolving 

 bands of chocolate and orange, each usually tipping the tubercles 

 only, and of the width of two tubercles ; aperture yellowish to 

 dark chocolate. Length, 15-18 mill. 



Philippine, Viti, Caroline Is., Australia (Brazier). 



The usual coloration of the species, as described above, is 

 represented by E. lauta, Reeve (fig. 18), the figures of E. alveolata 

 g^ven by Kiener (figs. 16, 11) being without the orange bands. 

 E. alveolata of Reeve, Carpenter, etc., is a very different species. 

 Other synonyms are E. histrio, Reeve (fig. 19) and E. trifasciata, 

 Reeve (fig. 20) the latter a scarcely distinguishable variety, in 

 which the decussation is not so strongly marked as in the 

 typical form. 



E. ZEPA, Duclos. PL 61, fig. 21. 



Shell yellowish white, the tuberculations of the longitudinal 

 ribs colored by alternate revolving bands of dark chocolate and 



orange. Length, 6 mill. 



Habitat unknown. 



