140 CANTHARIDUS. 



There are four pedal appendages on the right and three on the left 

 side, and there are also the two head lappets common to Trochus. 

 The teeth are like those of Margarita. {Challenger Gasterojioda, 

 p. 65.) 



C. PiCTURATA H. and A. Adams. PI. 45, figs. 46-48. 



Shell narrowly perforate, turrited, slender, thin, shining, white^ 

 Avith longitudinal undulating or zigzag pinkish or purplish lines, 

 often uniting to form spots at the periphery, or prominently angled 

 there ; sometimes with spiral bands at periphery and around umbili- 

 cus ; whorls about 7, convex, more or less carinated at the periphery, 

 the carina exserted above the sutures on the spire ; surface of base 

 marked by distant impressed concentric grooves ; suture margined ; 

 aperture oval, outer lip thin, columella thin, arcuate not truncate, 

 and slightly expanded above, but not covering the umbilicus. 



Alt. 8-12, diam 5-7 mill. 



St. Vincent's Gulf and Port Jackson, Australia ; Stuart Id., 



Ne\o Zealand. 



L.picturata H. & A. Ad. Ann. and Mag. N. H., 1863, p. 19.— 

 Angas, p. Z. S. 1865, p. 181 ; P. Z. S. 1867, p. '21Q.—Banhivia 

 (Leiopyrga) picturata E. A. Smith, Zool. Coll. H. M. S, ' Alert ' p. 

 75. — Trochus (Leiopyrga) picturata Watson, Rept. Challenger 

 Gasteropoda, p. 65. 



The specimens of this species before me are like those described by 

 the brothers Adams. There seems to be the same variations in color 

 shown by Bankivia fasciatus. Mr. Smith says : A variety has the 

 middle of the whorls encircled by a plain narrow zone, without the 

 series of spots at the periphery of the last. Messrs. Adams de- 

 scribed these spots as being ' round ' in the specimen they examined ; 

 in those before me they are rather angular, being the zigzag turn of 

 the longitudinal lines. A third variety has a pale band around the 

 middle of the last volution which falls at the lower part of the 

 upper ones, the lower portion being pinkish or closely lineolated 

 with pink. The lower half of the body-whorl has a broad pinkish 

 band beneath the central white one, which is succeeded by a nar- 

 rower plain zone, which in turn is followed by another fine pink 

 one. A fourth form, with the exception of the upper part of the 

 spire and the umbilical region, is of a uniform grayish violet. 

 * * * * The spiral sulcation and ridging is much more developed 

 in some specimens than others. (Zool. Coll. ' Alert,' p. 75.) 



