NUCUUDJ5. 27 



simply, and very sliarplv acuminated, tlie tip subcentral, rather 

 beknv tlian above the middle. Front dorsal slope short, rather 

 slit,dit, plano-convex: hinder dorsal slope produced, moderate, 

 straiijiitish. Ventral mare;in more or less arcuated m front, risnig 

 withlcss convexity and wUhout terminal indentation behind. No 

 defined dorsal area in front : hinder one large, anguhirly ''efined, 

 plicately wrinkled at the circumference, smoothish in tlie middle. 

 —A sins^le specimen, without known locality, is present m Mr. 

 Taylor's fiue collection. The form reminds one of Conrad's eborea, 

 but the sculpture differs. The ribs on the posterior ridge form 

 obtuse angles with the concentric ones. 



45. L. coMMUTATA, Phillppi, f- SO, 81.— T. perparva, ovato- 

 acuta (siepe angustior), postice repente acummato-snbrostrata^, 

 subsquilateralis, albida, undiciue dense et conceiitncc lirata, porca 

 antica radiata. Margo dorsahs antice leniter declivis ; poslice vix 

 subretusus ; ventralis arcuatus, utriuque multnm acclivis. Area 

 ma-^na, ovali-lanceolata ; iuferue concaviuscula, longitudmaliter 

 creuata. Lunula minima, inconspicua.— Small, peaked-ovate 

 (often a little elongated), subventricose, whitish, with a radiating 

 fold near the front extremity, closely and concentrically lyrated 

 throughout ; the interstitial siilci broader and unsculptured. Ex- 

 tremit^y of the slightly shorter anterior side contracted and rounded. 

 Posterior side rapidly acuminated; the sharp subrostrated tip 

 nearly subcentral. Front dorsal slope very moderate, coiive^^ or 

 ])lano-convex ; hinder dorsal slope straightish or subretuse. Ven- 

 tral margin arched, much rising at both ends, straighter behind 

 scarcely, if at all, refuse before the obsolete or planulate umbonal 

 ridge. Escutcheon large, oval-lanceolate, near its subcrenated keel- 

 like limits more concave and longitudinally crenated. Lunnle 

 more or less conspicuous, very small, merely wrinkled.*— This tiiiy 

 species was apparently comprehended by Chemintz m his Area 



fragilh (Conch. Cab. vii. p. 199), but his figure (f. 546) repre- 

 sents a much larger shell. 



46. L. RETICULATA, Ehuls, f. 103.— T. minima, ventricosa, 

 ovato-acuta, postice acuminata vixque rccurvata, tequilateralis, 



♦ I am unable to recognize a shell said by Philippi to closely i-csemble his comm,,. 

 lata, but to be devoid of the radiating fold, and to be nearly smooth m the middle 



*°l''™"aus (Nucula, a, PhUipf,, Zeihch.Malak. 18.51,;). 87).-" T. ovato-oblonga, 

 gibba antice rotuudata, postice in rostrum acutum clongatuin adsccndentcni produeta, 

 transvcrsim sulcata ; carina lameUosSl aream cingente ; carina radiantc in media area ; 

 serie punctorum inipressorum, utrinque lunulam ornantc, canna lateris antici omiiino 

 obsoleta. i- China." 



