1899.] NATURAL SCIENCES OF PHILADELPHIA. 149 



coarse, spiral lines on the intercostal spaces; they are examples of 

 an undescribed species or possibly a variety of T. elegans Verrill. 

 Two specimens (c), one badly worn and one young, have the 

 whorls slightly more convex, with seven (7) equally separated, 

 coarse, incised lines between the ribs, and agree with U. S. F. C. 

 specimens of an undescribed species foimd abundantly in Vine- 

 yard Sound. One specimen (d), badly Avorn, is like another 

 undescribed U. S. F. C. species, a comparatively few specimens of 

 which have also been found in A^ineyard Sound. The spirals are 

 of unequal size and are arranged in two wide, deep, but little 

 separated grooves, just above the suture; a group of three similar 

 grooves, a little above the middle of the whorls, above and below 

 which are about seven fine, incised lines, sometimes a few finer 

 ones appear, so that there are in all from twenty to twenty -two 

 lines. An example with about 10 whorls is over 7 mm. long and 2 

 mm. in diameter. 



An example of this species, labelled T. interrupta, thought to 

 have been identified by Stimpson, has been sent to me by Dr. Dall. 

 Several very poor ones (Nos. 79,008 and 68,426) found at Sea 

 Isle City, N. J., were also received from Philadelphia. 



Gould, in his first report on the Invertebrates of Massachusetts 

 (1841, p. 268), redescribes and figures the species, but evidently 

 ■did not have access to the type, as the figure is very unlike 

 Totten's, and the ribs and spirals are given as follows : 



" 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 regarded as one." 



Prof. John M. Clarke has recently very courteously consulted 

 the records of the State Museum, Albany, N. Y., and failed to 

 find such a species in the Gould collection, so that the above 

 remarks probably applied to Adams' specimens. 



Stimpson, 1851, records additional examples which he found 

 in Boston harbor. 



As the locality of the type was Newport, R. I., harbor, it is 

 safe to assume that the species could also be found in the near 

 vicinity, at Narragansett bay; but none of the southern specimens 

 in this collection, identified as interrupta, are at all like any form 

 found by the U. S. F. C. in that locality. Figures and descrip- 



