OLIVA. 79 



0. SANGUINOLENTA, Lam. PL 23, figs. 27-29 ; PL 24, figs. 30,33. 



Cylindrically oblong, with short, partly sunken spire ; cream- 

 color or light olive, covered with very numerous, generally minute 

 and close zigzag chocolate lines and reticulations, and which 

 often form a subsutural and a median band ; interior of aperture 

 fleshy white ; columella and fasciole richly marked with orange- 

 red. Length, 1-75-2-25 inches. 



Mauritius, Indian Ocean, Philippines, New Caledonia. 



The form is the same as in O. maura, but the very close, minute 

 pattern of coloring and brilliant columella will distinguish it. 

 0. evania, Duclos (fig. 29), is a synonym, and 0. pindamella, 

 Duclos (fig. 33), is believed to be a young, rubbed specimen of 

 this species. 0. Keeni, Marrat (fig. 30), partakes of the characters 

 of the next species, but its closest relationship is with 0. san- 

 guinolenta. 



0. IRISANS, Lam. PL 24, figs. 31, 32, 34-42 ; PL 25, figs. 43-49 ; 

 PL 26, figs. 50-54 ; PL 27, figs. 55-60; PL 1, fig. 3. 



Shell flesh-colored, orange-brown or chocolate, with zigzag 

 brown lines, shaded with ash and orange, and faintly or inter- 

 ruptedly two-banded ; fasciole slightly tinged with orange ; interior 

 of aperture white or flesh-color or faintly bluish. 



Length, 2-3 inches. 



Mauritius, Ceylon, Java, Philippines, Australia, Polynesia. 



Reeve, Marrat and Weinkauff have distinguished a number of 

 species which I am compelled to treat as synonyms, because the 

 large suite of specimens before me shows that these are partly 

 merely transition forms and parti}' distinctions based on size 

 only. A rather narrow cylindrical and small variety has been 

 selected for 0. irisanx (figs. 34-36), and a larger growth, not so 

 cylindrical, for 0. zeilanica. Lam. (fig. 37), with which 0. Phi- 

 lantha, Duclos (fig. 38), is synonymous ; 0. galeola, Duclos (fig. 

 39), is also a synonym. 



Yar. CONCINNA, Marrat. Figs. 40-45. 



A somewhat smaller shell than 0. irisans, differing principally 

 in the interior of the aperture being blue or violet. With this 

 variet}*- must be united 0. cylindracea (fig. 42), 0. clara, (fig. 

 43), O. lignaria, (fig. 44), and O. ornata (fig. 45), all of Marrat. 



