KUCULID.E. 119 



hinder side quickly forming an upturned beak, of which the rather 

 narrow tip is convex, and above the middle. Front dorsal slope 

 slight, straightish j hinder dorsal slope moderate, deeply incurved. 

 Ventral margin much arcuated, rising obliquely in front, not re- 

 fuse behind. Escutcheon large, defined, finely grooved length- 

 ways. Lunule inconspicuous. Teeth numerous on both sides. 

 .1 udging from the nucleus, the fry may readily be mistaken for a 

 distinct species. Montagu described the species as new, and not 

 as of Gmelin, whose rostrala was identical with pernala. 



25. L. Chuva, Gray, f. 67. — T. L. crassce simillima, brevior 

 antem, ovato-acuta, margine dorsali utrinque decliviore, ventrali 

 magis arcuato ; rostri extremitate altiore, magisque acuminata. 

 Lyrse plicte umbonalis nonnunquain interne subobsoleta?. — Most 

 closely resembling crassa, but is peaked-ovate ; the slopes are con- 

 sequently more decided, and the ventral margin more arched; the 

 peak is rather more acuminated, and higher seated; the lyree, too, 

 are scarcely so prominent, and the arched ones on the umbonal 

 ridge become, occasionally, almost obsolete at the lower extremity. 

 The difference between this and crassa, var. brevior, is very 

 trifling. 



26. L. confusa, Hartley, f. 85. — T. aequilateralis, ovali-acuta, 

 postice rostrata, haud ventricosa, cute cinereS induta, sulcis densis 

 concentricis undique sculpta. Rostri extremitas recurvata, acute 

 angularis. Plica umbonalis neque alta, nee antice definita. Margo 

 ventralis antice convexus, vixque declivis ; postice declivis, principio 

 rectiusculus, demum repenteincurvatus; ventralis utrinque acclivis, 

 antice arcuatus, postice haud sinuatus. Areae dorsales magnae, 

 lanceolate, labiis protasis : area sublongitudinaliter sulcata : lu- 

 nula impressa. — Peaked-oval, convex or subventricose, with a 

 shining ash-coloured epidermis, closely, regularly, and concentri- 

 cally grooved throughout (the dorsal areas excepted) ; sulci shelv- 

 ing in front, their intervals converted into flattened costae on the 

 uinboes and towards the umbonal ridge, which latter is neither 

 elevated nor defined in front. Sides equal, or very nearly so : 

 anterior extremity rounded ; posterior side rather abruptly beaked, 

 the tip, which is either in the middle or just above it, upturned 

 and sharply angular. Front dorsal slope very slight, convex, with 

 a sudden terminal refusion. Hinder dorsal slope moderate, at 

 first straightish or plano-convex, eventually rather suddenly in- 

 curved. Ventral margin much rising at both ends, arcuated (at 

 the least, in front), devoid of refusion. Dorsal areas large, pouting, 

 lanceolate; escutcheon carinately defined, sublougitudinally grooved; 



