268 INVERTEBRATA OF MASSACHUSETTS. 



Turrite'lla interru'pta. 



Shell small, subulate, brownish-ivhite, reticulated with numer- 

 ous ribs and revolving lines, which are interrupted hy the ribs, 

 and three faintly colored bands. 



Figure 173. 



State Coll., No. 271. Soc. Cab., No. 2358. 



Turritella interrupta, Totten ; SUliman's Journ., xxviii. 352, f. 7. Adams ; 

 Bost. Journ. JVat. Hist., ii. 275. 



Shell small, very slender and pointed, pale brownish-white, 

 glossy ; whorls eight or ten, slightly convex, the suture well de- 

 fined, on which are from twenty-five to thirty straight, blunt ribs, 

 crossed by about fourteen revolving lines, which are interrupted 

 by the ribs ; these lines are arranged in pairs, but so close to each 

 other, as not always to be distinguished, and would usually be re- 

 garded as one ; on the anterior half of the lower whorl, the ribs van- 

 ish, and the fine revolving lines are uninterrupted. In fresh speci- 

 mens may be seen a purplish band just below the suture, and on 

 the anterior whorl two faint-yellow ones ; aperture about one 

 sixth the length of the shell, ovate, sharply angular behind ; outer 

 lip sharp and simple, inner lip slightly everted. Length | inch, 

 breadth yV inch, divergence 12°. 



First found by Colonel Totten in the harbour of Newport, 

 Rhode Island ; and since found by Professor C. B. Adams, in 

 Dartmouth harbour, by dredging beyond low-water mark. He 

 has also found it in New Bedford harbour. 



It is readily recognised by its slender, pointed, glossy appearance, 

 and its reticulated surface. Several recent and fossil species resem- 

 ble it in size and shape, among which are Turho elegantissimus, Mon- 

 tagu ; Turritella cBqualis, Say, and T. laqueiita, Conrad. 



This species does not belong to the genus Turrite'lla ; but will 

 probably come under the genus Eu^lima of Risso. 



Genus PYRAMIS; Brown. 



Shell elongated, of numerous ivhorls ; aperture short, ovate, en- 

 tire in front ; lip sharp, disunited behind ; pillar without a fold. 



