PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 383 



The name peUucida clearly Kas priority for this species, and should be 

 adopted; moreover, hyaUna had been previously used. Jeffreys, al- 

 though he admits the priority of Brown's name, claims that it is " obso- 

 lete" because no one has used it, "except its author". But Loven, A. 

 Adams and others have correctly adopted it. Moreover, Jeffreys him- 

 self does not apply this idea in regard to "obsolete" names in many 

 other cases^ as, for example, in the case of Margarita olivacea (Brown), 

 an " obsolete" name revived by him to replace argentata Gould. 



Cylichna Gouldii (Couth.) Verrill. 



Bulla GouldU Coutliony, Bost. Journ. Nat. Hist., ii, p. 181, pi. 4, fig. fi, 1838. 

 Utriculus Gouldii Stimpson. — Gould, Invert. Mass. (second ed.), p. 217, fig. 508. 



Living specimens of this species, of large size and in considerable 

 numbers, were dredged by us in 1879, off Cape Cod, and especially on 

 the sandy portions of Stellwagen's Bank, Massachusetts Bay, in 15 to 25 

 fathoms. 



An examination of the animal shows that it has a gizzard, with cal- 

 careous plates, while its dentition agrees with Cylichna, to which it should 

 be referred, notwithstanding the character of the spire of the shell. 

 The median teeth are deeply bilobed ; the inner lateral ones large and 

 hooked; outer laterals four on each side, slender, spiuiform. 



This species is very distinct from Diapliana pertennis {=J3nllaper- 

 tenuis Migh.), with which it has sometimes been confounded. The latter 

 occurred at station 894. 



Philine amabilis Verrill. 



Amer. Journ. Sei., sx, p. 398, Nov., 1880. 



Animal large, about an inch long, even in alcoholic specimens. In 

 preserved specimens the anterior lobe is large, oblong, truncate behind, 

 obtusely pointed in front, slightly narrowed backward; lateral lobes 

 large; posteriorly the thin membrane covering the shell projects back- 

 wards beyond it, and its free edge is divided into several wide, but short, 

 lobes ; foot large. 



Odontophore with a large inner lateral, hook-shaped tooth on each 

 side, having its inner edge very finely serrulate and each of its lateral 

 edges bordered by a sharp ridge ; outside of these there is on each side 

 a single, very much smaller, slender, spiuiform, very sharp, slightly bent 

 tooth. 



Shell large, but exceedingly thin and delicate, diaphanous, lustrous, 

 and iridescent, with a very wide aperture. The outline is broad-oblong^ 

 rounded at both ends; the outer lip, forming the greater part of the 

 shell, is evenly rounded posteriorly, and scarcely projects beyond the 

 level of the spire; in the middle it projects forward in a regular curve, 

 and recedes rapidly in front, where it also becomes slightly broader, and 

 forms a very obtuse, rounded angle ; the anterior end is broadly rounded 

 and very much cut away, so that in an end view, from the front, the 

 whole interior of the spire is visible. The inner lip is thin and shari>- 



