Phasianella.] GASTROPODA. 109 



Distribution. All tropical and subtropical seas. 

 Fossil. Tertiary. 



The animals are very active, the foot is much elongated when 

 crawling, and they usually live together in numbers. 

 Vernacular Name. Pheasant-shell. 



Subgen. 1. TRICOLIA, Bisso, 1826. 



Tricolia, Risso, Hist. Nat. do 1' Europe Merid. Type : Phasianella speciosa, 

 Miihlf. 



The head of the animal without frontal lobes. Shell small. 



1. Phasianella Huttoni, Pilsbry, 1888. Plate 34, fig. 12. 



Rissoa flammulata, Htitton, J. do Conch., 1878, 28. Phasianella Huttoni, 

 Pils., Man. Conch. (1), x, 174. Barleeia flamulata, Hutt., M.N.Z.M., 81. 

 Rissoa flammulata, Hutt., P.L.S. N.S.W., ix, 941. 



Shell small, ovate-elongate, thin, shining, impeiiorate, pink, smooth. 

 Sculpture consisting only of subobsolete growth-lines, distinct only 

 below the suture. Colour either uniformly bright rose, or rose with 

 oblique rays of white ; these 1'ays are narrow and subequal, usually 

 accompanied by broad white zigzag rays, situate between suture 

 and periphery of the whorls ; the rays are never extending upon the 

 base, which is uniformly rose. Epidermis thin and glossy. Spire 

 elevated, conic, nearly twice the height of the aperture. Protoconch 

 small, conic, rather obtuse, of about 2 smooth whorls. Whorls 7, 

 slightly convex ; base convex. Suture impressed, sometimes sub- 

 margined below. Aperture ovate, white within. Outer and basal lip 

 rounded, with a rather blunt edge. Columella short, subvertical, white, 

 broad, and smooth. Inner lip spread out very little beyond the 

 columella, uniting the margins by a thick and white parietal callus. 

 Umbilical area not depressed. 



Diameter, 3-75 mm. ; height, 6-75 mm. 



Dentition unknown. 



Type in the Otago Museum, Dunedin. 



Hob. Auckland (T. F. Cheeseman) ; Takapuna Beach (H. S.) ; 

 Bay of Islands (J. C. Anderson). 



Fam. UMBONIIMJ, Adams. 



Animal with the rostrum rudimentary ; the frontal lobes greatly 

 developed. 



Shell orbicular, flattened, not umbilicated, the umbilical region 

 often covered with a callous deposit ; operculum horny, thin, of many 

 gradually enlarging whorls, finely ciliated on the outer edge. 



Distribution. Indian and Pacific Oceans. 



Fossil. Devonian to Tertiary. 



