NUCULID*. 25 



roiiceiitrjp, ratlipr ili'|)irsscd, usiKilly ahsfut above just licliiiii! tlu^ 

 subaiii,nilar yet, not iiiiicli raised uriiboiial I'idge. I'lxlreiiiily of 

 thi) somewliat shorter anterior side narrowed, bluntly rounded. 

 Posterior side gradually attenuated to an acuminated beak, the tip 

 subcentral, slightly upturned. Front dorsal slo])e somewhat convex, 

 not very decided : hinder dorsal slope moderate, straightish, even- 

 tually incurved. Ventral margin arched in front, straighter and 

 more rising behind, not conspicuously indented posteriorly. Lu- 

 nule narrow, inconspicuous : escutcheon large, angularly defined, 

 densely and most linely costellated lengthways, its lips ])r()truding. 

 Under a powerful lens, some minute interstitial lyrse may at times 

 be descried both on the umboes and behind them. — D'Orbignv, 

 in his plate, has corrected the larger admeasurement (20 milli- 

 metres) he had indicated in his text. 



42. L. c.ELATA, Rinds, f. 95, 96. — T. ovali-acuta (nonnun- 

 quam latior), ])ostice rostrata, nequilateralis, ventricosa, cute oli- 

 vaceo-flavida nitidissima, induta, undique, nisi postice superne, 

 concentricc sulcata. Extreraitas rostri angularis, recurvata. Jlargo 

 dorsalis antice niagis minusve declivis; postice declivis, vel sub- 

 declivis, demum incurvatus ; ventralis utrinque acclivis, antictj 

 arcuatus, in medio tantum convexus. Areje dorsales sicut in L. 

 ventricosa, obsoletius autem insculptEE. — Peaked-oval (or oboval), 

 more or less ventricosc, retuse near the hinder slope, briefly yet 

 patulously gaping at the hinder tip, clothed with a lustrous yel- 

 lowish-olive epidermis, concentrically grooved, except on the dorsal 

 areas, and a smooth, narrow, triangular slip adjacent to the pos- 

 terior slope : umbonal ridge scarcely elevated. Sides subequal ; 

 the front, if either, the longer, rounded at its extremity ; posterior 

 side quickly beaked, its angular and upturned tip central. Front 

 dorsal edge more or less sloping aiul convex : hinder dorsal slope 

 more or less decided, incurved at its termination. Ventral margin 

 rising at both ends, arched in front, convex in the middle, nowhere 

 conspicuously retuse. Dorsal areas nearly like those of ventricosa, 

 but the sculpture somewhat obsolete.* — The shape (with its cor- 



* I am unalilo to procure an c\aniple of a Leda said to resemble this species, but 

 here condense the ])ublished description. — 



ere condense the published description. — J I ] s"> 



],. SULCULATA, ( nuth. — Thick, witli a dark-olive slcin, modified oval, rounded and ^T ' /^ > "Z 3 , » . / T+, 

 noothal the anterior extremity, elsewhere with tine sbarj)ly incised concentric lines; U U 



smooth at theanti 



attenuated and subrostrated lichind, the tip (which is more ]iromineiit above) some- 

 what obliquely truncated, timbonal ridt;e blunt. lieaks iirotuberant, anterior. 

 Ventral ed^c curved. Luiiulc lar^e, oval, profound, with mere wrinkles of increase. 

 Escutcheon ample, broadly elliptical, defined by an incised line, faintly striated. 

 Teeth 1.5-20. I-^-t't- 



The Leinhnlus xulciilnlus of Kisso is too inadequately defined for ideiitiricalion. 



K 



