OF CONCHOLOGY. 



75 



lip bifurcate ; canal short, recurved and slightly twisted ; color 

 brownish red, last whorl crossed at the middle with a pale band, 

 varices banded transversely with whitish and black; covered with 

 a scaly epidermis, bearing longitudinal rows of stiff bristles. 



The above is intermediate between aquatilis, Rve., and piU- 

 ariSy Linn. From the former it differs in wanting longitudinal 

 ribs. Its columella agrees with that of pilearis, while its outer 

 lip resembles that of aquatilis. In color it differs from both. 

 Aquatilis is a ponderous shell, attaining to six inches in length ; 

 inlearis is lighter and of a more fusiform shape, and intermedius 

 partakes of the shape of aquatilis, but seldom exceeds three 

 inches in length. The animal of aquatilis is of a pale straw 

 color, covered with crowded round spots of various sizes, varying 

 from a light to a dark reddish brown ; disk of the foot dull pink- 

 ish ash and spotted with reddish brown. Pilearis is of a pale 

 cream color, spotted with black. 



The animal of interwedius, Pse., is covered with spots, irreg- 

 ular in size and shape, of a dark brownish red, margined with 

 yellow, the interspaces of a light reddish fawn ; where the spots 

 closely approximate, the interspaces are yellow. 



Melampus lucidus. Pease. 



T. oblongo-ovali, tenuiscula, pellucida, alba, nitida, imper- 

 forata ; spira brevis, acuta ; anfr. marginatis, ultimus in medio 

 planulatis ; plicae parietalis 2, supera parva, fere obsoleta, altera 

 prope basin, transversa, compressa, valida, plica columellaris, 

 obliqua, porrecta, in marginem basalem continuata ; labro medio 

 subincrassato, postice vix sinuoso, intus Isevi ; apertura angusta, 

 basi rotundata. 



Long. 3^. Diam. 2 mill. 

 ffab. Insl. Oahu, ? Annaa. 



Shell oblong-oval, rather thin, pellucid, white, shining, imper- 

 forate ; spire short, acute ; whorls marginate, last whorl flattened 

 on the middle ; two folds on the inner wall of the aperture, pos- 

 terior one small, almost obsolete, the other near the base, prom- 

 inent, transverse, compressed ; columella fold oblique, porrected, 

 continuous with the basal margin ; aperture narrow, rounded at 

 base ; outer lip slightly thickened at the middle, and slightly 

 sinuous posteriorly, smooth and simple within. 



Two mature and several young specimens were lately found 

 under stones, above high-water mark, at a locality I have fre- 

 quently marched over ; it is, consequently, rare. I have con- 

 nected with it specimens which I received from the Island of 

 Annaa (Paumotus), not being able to detect any difference, 



