K. J. Bush — Notes on the Family Pyramidellidw. 481 



The genus Peristichia Dall, 1889 (type P. torem Dall, 1889), 

 used as a subgenus of Turbonilla, 1904, p. 9, seems to have 

 more affinity to Bissoina than to any genus among the Pyra- 

 midellidse. 



The name Turbonilla areolataY evv'iW is not preoccupied by 

 Turritella areolata St., 1851, nor Chemnitzia areolata Ray- 

 neval, 18 — , which is equal to Turbonilla indistincta Montagu 

 (teste Jeffreys, 1884). This rare species, p. 484, f. 4 (type from 

 New Haven, Conn.), described by Terrill, 1874, has flattened 

 whorls, giving it an obelisk-like form. The axial ribs are nar- 

 row, with wide, shallow, intercostal spaces, crossed by five dis- 

 tinct, incised lines or series of pits. In some specimens the axial 

 ribs appear only as interruptions of the spiral sculpture. The 

 areolata of Bartsch (p. 86, pi. 12, figs. 19, 24) is another spe- 

 cies similar to Turbonilla (Pyrgiscus) vinece Bartsch (p. 83). 



Turbonilla interrupta (Totten) Bnsh, 1899, pp. 148-151. 



Turritella interrupta Toiten, 1835, p. 352, fig. 7. Type locality, — Newport 



Harbor, E. I. 

 Not Chemnitzia interrupts A. Adams, 1853. 

 Not Turbonilla interrupta 0. B. Adams in Amherst collection. 

 Not Turbonilla (Pyrgiscus) interrupta Bartsch, 1909. 

 Not Eulima interrupta Sowerby, 1834, = Niso Sowerby, 1854. 

 Not Eulima interrupta A. Adams, 1884, — Eulima secunda, new name. 



An historical sketch of this species was given by me in 1899. 

 Figure 9, produced here for the first time, is from an U. S. F. C. 

 specimen dredged in 1880, at station 770, Earragansett 

 Bay, in 8 fathoms. The specimen measures about 5 mm in 

 height and about l-5 mm in breadth. Figure 10 is a piece of 

 the shell greatly enlarged to show the character of the micro- 

 scopic sculpture, especially the incised or impressed spiral lines. 

 These incised lines, varying in width, produce an alternating 

 series of apparently raised ones, often arranged indistinctly in 

 pairs, and agree well with the description given by Totten. 



The specimen described (p. 87) and figured by Bartsch, 

 unfortunately does not agree with this, therefore I would dis- 

 tinguish it as Turbonilla pseud ointerrujpta, new name. 



The shells, as a rule, are of a lustrous white color, semitrans- 

 parent when fresh, often with one, sometimes two, delicate 

 median, or sutural and median bands of rufous ; in some of 

 the most mature specimens this color entirely covers the whorls, 

 especially the upper ones. 



Turbonilla {Pyrgiscus) buteonis Bartsch (p. 89) is the same 

 as sp. f in our U. S. F. C. collection. 



Turbonilla (Pyrgiscus) sumneri Bartsch (p. 92), type and 

 only specimen, is probably the young of a more common spe- 

 cies. The young often appear disproportionately stouter than 

 the adult forms. 



