382 BULLETIN OF THE 



2606, and 2612, off the coast of North Carolina, in 25-124 frm ., gravel, bottom 

 temperature 58° to 77° F. 



This species is nearest to Trochus ductus of Philippi, but differs in so many- 

 details of sculpture, etc., that, though variable, I do not see my way clear to 

 unite them at present. The coloration is variable; some are clouded with 

 olive, and others with pinkish brown 



A variety, depressa, has the spire low and somewhat tabulated by a smooth 

 space between the suture and the spiral ribs. 



Solariella iris Dall. 



Plate XXI. Figs. 7,7a. 

 Margarita iris Dall, Bull. M. C. Z., IX. p. 43, 1881. 



Habitat. Sand Key, in 119 fms., living, Sigsbee. 



Only one specimen of this form has been found. The upper surface much 

 resembles that of M. (5.) lacunella, but the base, especially the umbilicus, is 

 altogether different, the shell is thinner and much more pearly, and the spiral 

 lines are much finer. 



Solariella lubrica Dall. 



Plate XXI. Figs. 0,9a. 

 Margarita lubrica Dall, Bull. M. C. Z , IX. p. 44, 1881. 



Habitat. Station 2, in 805 fms.; Station 220, off Santa Lucia, in 116 fms., 

 rocky bottom, temperature 58°. 5 F. 



Var. iridea Dall. Shell without the coronation at the suture, or only slight 

 traces of it, umbilical carina less strong, umbilicus smaller, whorls inflated, very 

 round, brilliantly pearly, base wider than in the type. 



This extremely lovely little shell, when fresh, has a most brilliant greenish 

 nacre, shining like a diamond beetle. The variety was dredged by the U. S. 

 Fish Commission, off Cape Florida, in 193 fms., sand, bottom temperature 

 43°-4 F. 



tionus ETTCHELUS Philips. 

 Euchelus guttarosea n. s. 



Plate XXXIII. Fiff. 7. 



Shell small, white, the upper surface of the whorls with very small distinct 

 rose-red dots sparsely distributed on the raised nodules of the sculpture, or all 

 white; five or more inflated strongly sculptured whorls, and a smooth nucleus. 

 Spiral sculpture of, on the upper surface of the last whorl, two small and two 



