92 BULLETIN OF THE 



seen on other parts of the shell ; transverse sculpture varying with different 

 individuals ; in those where it is strongly developed it consists of from nine 

 (on the third whorl) to fourteen (on the last whorl) sharp-edged plications 

 running clear across the whorls, rounder and wider near the middle of the 

 whorls, and on the last disappearing half-way from the periphery tu the canal; 

 these plications run straight up and down the spire, and are strongest (though 

 rather narrower) at their posterior ends, at which the plication often rises into 

 a little tubercle, which is not only appressed against but even extends over the 

 suture, which, in consequence, has a wavy outline ; the spaces between the 

 plications are wide and evenly excavated ; in other specimens the plications 

 will be much fainter, not raised into a tubercle at their posterior ends and 

 evanescent on the larger whorls at a short distance in advance of the suture ; 

 the suture in such specimens is more even and distinct than in those previously 

 described, and the lines of growth are usually more evident The pillar is 

 stout, twisted a little to the left, and, with the canal, distinctly recurved, its 

 inner side covered with a thin smooth white callus ; the outer lip gently 

 arched, slightly thickened, and reflected, contracted a little at its anterior end 

 to form the short wide canal, and having internally, about midway between its 

 junction with the body whorl and the canal, a single small rounded pustule- 

 shaped callus ; there are no denticles or other armature to the mouth with the 

 above exception, which is invariably present in perfectly mature specimens. 

 A moderately plicate shell measured as follows : — Lon. of shell, 9.0 ; of last 

 whorl, 5.0; of aperture, 3.5. Max. lat. of shell, 3.0; of aperture, 1.5 mm. 

 Another strongly sculptured specimen measures 9.25 mm. long and 3.12 mm. 

 broad. 



Sculptured variety, Station 2, 805 fms. ; Station 19, 310 fms. ; Station 47, 

 331 fms. Normal form, Station 43, 339 fms. ; Station 47, 331 6ns. 



This species is most nearly allied to Astyris rosacea Gould, from which the 

 faintly sculptured specimens differ by the smaller mouth in proportion to 

 the spire, and the characters of the epidermis and aperture; the characl 

 the plications also differs from that of A. rosacea. The strongly sculptured 

 specimens do not at all resemble rosacea, except in size and number of whorls. 

 The latter would usually be referred to Anachis and the former with A. rosacea 

 to Attyris, but there can be no doubt that they are forms of one species. This 

 without prejudice to the proper separation, maybe, of certain species under 

 the name of A nachis. 



This species was obtained in some numbers, so that I wa^ prepared to find it 

 described ; but a pretty thorough search has not revealed any reference to it in 

 the various publications I have consulted. Professor Verrill, to whom I 

 have greal pleasure in dedicating it, may perhaps secure it with other South- 

 ern forms "ir the coast of New England during the r esea rches he is now eon- 

 ducting. The solitary pustular denticle is a very peculiar, and, as far as I am 

 aware, unique feature. 



