158 NUCULID.E. 



rentes vix declivis ; postice rectiusculus, satis modice declivis ; 

 ventralis integer, arcuatus, utrinque valde acclivis. Areee dorsales 

 haud definite : postica subplanulata. — Oval, thin, much longer 

 than broad, only subveutricose, with a polished greenish-olive (or 

 more rarely brownish-olive) epidermis, smooth, with at most ob- 

 solete wrinkles of increase, which are more manifest on the lunu- 

 lar region, rounded at both ends, somewhat taperingly so in front, 

 subangulately so behind. Hinder side rather elongated for the 

 genus. Front dorsal edge convex, at first scarcely sloping ; hinder 

 one only moderate, straightish. Ventral margin entire, arcuated, 

 much curving up at both ends. Dorsal areas undefined, the hinder 

 one somewhat flattened. Beaks not prominent. 



26. N Strangei, A. Adams, f. 125. — T. valde obliqua, sub- 

 ovata, longitudine latitudinem multo superante, cute nitidissima 

 aureo-virente induta, concentrice corrugata. Extremitas postica 

 haud perbrevis (utpote Nucula est), infeme rotundato-angulata. 

 Margo dorsalis antice primum convexus vixque declivis ; postice 

 haud repente declivis. Margo ventralis integer, arcuatus, utrinque, 

 et postice preesertim, multum acclivis. Lunula haud definita, 

 prope nates parvas vixque eminentes subimpressa ; labiis aliquan- 

 tum protrusis. Area aliquantum prominens, obsolete circum- 

 scripta. — Very obliquely subovate, much longer than broad, very 

 thin, rather compressed, with a polished pale golden-green epi- 

 dermis, and faint but regular concentric wrinkles. Anterior ex- 

 tremity well rounded, front dorsal slope at first slight and convex. 

 Posterior side not short for the genus, hinder dorsal slope short, 

 not abrupt, but moderate, forming a rounded-off angle with the 

 ventral margin, which is arcuated, entire, and rises greatly on both 

 sides, but especially so behind. Lunular region undefined, some- 

 what impressed near the small and little projecting beaks, its lips 

 rather pouting. Front dorsal area rather prominent, indistinctly 

 defined by a refusion. 



27. N. simplex, A. Adams, f. 137. — T. oblique ovata, longi- 

 tudine latitudinem multo superante, tenuis, subventricosa, cute 

 nitidissima olivaceo-virente induta, intus cserulescens, vix laevis, 

 obsolete concentrice striata. Extremitas lateris postici perbrevis, 

 iuferne obsolete obtusangulata. Margo ventralis integer, multum 

 arcuatus, postice oblique acclivis. Nates acutse, haud eminentes. 

 Lunula parva, concentrice striata, inferne impresso-planulata, su- 

 perne protrusa. Area prominens, haud autein definita. — Ob- 

 liquely ovate, much longer than broad, thin, subventricose, with a 

 polished epidermis that ranges in tint from pale to dark greenish- 



