On Some Neiv Marine Mollusca. 81 



— see vol. for 1875, p. 135, and vol. for 1876, p. 135. These 

 species, which I named P. littorinoides and P. pvopinqua, 

 differ from the one now described in being smaller, of less 

 solid habit, and having a purple aperture, which is also the 

 case with the shell described by Adams. 



Gibbula tesserula, n.s. PL, figs. 3, 4, 5. T. parva, 

 nitente, oblique depressa, prof uncle- umbilicata, tenui, atra, 

 ad peri/pheriam conspicue tesselata; anfr. 3-J, convexis, 

 regulariter distanterque spiraliter striatis, transversim 

 lineis tenuibus crebre decussatis; labro tenui, crenato, 

 labio reflexo, curvato ; a lahro vix sejuncto ; apertura 

 sub-quaclrata, intus tesselata, iridescente ; basi Icevi, polita, 

 eonvexa. Alt. vix. 4 mil. 



Shell small, shining, obliquely depressed, deeply umbili- 

 cate, thin, blackish, with a kind of purple iridescence, 

 conspicuously marked with a line of large square black 

 and white spots at the periphery ; whorls 3 \ to 4, convex, 

 regularly and distantly spirally striate, decussate transversely 

 with close fine lines. Outer lip thin, crenulate, inner lip 

 reflexed and curved, scarcely separated from the labrum ; 

 aperture subquadrate, tesselate inside, with a fine iridescent 

 film ; base smooth, polished, and convex. 



The depressed form of this shell and its conspicuous 

 tesselations distinguish the species from the many forms 

 of Gibbvlo; we have in the Australian seas. Gibbula 

 depressa, described by me in the Trans. Roy. Soc. Tas., 1875, 

 p. 154, is a dark tesselated form, but it is widely sulcate. 



Fossapjna funiculata, PL, figs. 6, 7, 8. F. t. oblique 

 depresso-globosa, quasi auriformi, obtecte umbilicata, solida, 

 opaca, albida, maculis et lineis angidaribus atratis ornata; 

 spira plaMO-convexa, vix elevata ; anfr. 3 J, carinatis, 

 carinis rotundatis mo^gnis et parvis altemantibus ; ultimo 

 anfr. valde expanso ; apevtura rotundata ; labro simplici, 

 vel crenato, columella subreflexa, umbilico sulciformi ; basi 

 funicvlata. Diam. 5, mil. circiter. 



Shell obliquely depressedly globose, almost ear-shaped, 

 subumbilicate, solid, opaque, whitish with dark zigzag lines 

 and spots ; spire plano-convex, hardly exsert ; whorls 3 J, 

 keeled, keels rounded, alternating large and small; last 

 whorl much expanded, aperture rounded, labrum simple or 

 crenulate, columella subreflexed, umbilicus represented by a 

 groove, base corded. 



This shell closely resembles F. Simsoni, nobis, which is 

 identical with F. Petterdiana, Crosse, a prior name. The 



G 



