68 Zoological Society. 



beneath a brown epidermis and white nacre. In these the peritreme 

 is very thick, and the columella more remarkably thick than hereto- 

 fore noticed in any Melanian. 



Melania hastula. M. testd striatd, nonnunquam plicatd, elon- 

 gate subulatd, diaphand, tenui, fused, striis transversis crebris 

 costulas decussantibus ; spird acuminatd ; suturis linearibus ; an- 

 fractibus piano -conveocis ; aperturd parvuld ; ovatd, intus v el fused 

 vel albidd ; columella incurvd tortdque. 



Hab. Various streams of Siquijor, Cagayan, Mindanao, and other 

 Philippine Islands. 



Length 3'3, diam. "8 of an inch. 



Remarks. — A very attenuate and greatly varied species, some 

 being smooth with few striae, others with striae over the whole sur- 

 face, and others again with numerous folds. In some of the speci- 

 mens under examination the apex is eroded in a very unusual manner, 

 the outer portion of the whorls there being so much decomposed as 

 to present little more than the central column. Some of the speci- 

 mens are dark brown, others are horn-colour with brown spots. 

 There are probably about twelve whorls. Although some of the 

 specimens have more or less distinct, somewhat distant folds, there 

 are others which have no folds whatever. This species is placed 

 among the striate group, as striae are found more or less developed 

 on every specimen. The striae immediately below the suture are 

 more deeply impressed and cause a slight groove. A variety from 

 Camiguing is flatter on the whorls and less disposed to plication. 

 The aperture is not quite one-fourth the length of the shell, is rather 

 open and somewhat patulous below. The operculum has its polar 

 point near to the margin on the left. 



Melania juncea. M. testa striatd, elongate subulatd, tenui, 

 tenebroso-fuscd, infra suturas luteo-lineatd ; spird altenuatd ; 

 suturis valde impressis, anfractibus undecim, convexis, lineis trans- 

 versis impressis ; aperturd parvuld, ovatd, intus fused ; columelld 

 valde incurvd contortdque. 



Hab. Lake of Taal, province of Batanos, and small streams in 

 Luzon, Philippines. 



Length 2, diam. *5 of an inch. 



Remarks. — An attenuate and gracefully formed species. Some of 

 the specimens are of a dark rich brown, others are flammate. Two 

 have very small incipient folds on nearly all the whorls, others have 

 a few towards the apex. From the same locality are four specimens, 

 which, while they differ but little in form, are very different in colour, 

 being yellowish, with longitudinal flammate browTi marks. This variety 

 answers very closely to M.flammulata, Von dem Busch, 'Conchylien/ 

 &c. by Dr. Philippi, tab. 1. fig. 3, 4. The aperture is about one- 

 fourth the length of the shell and is rather small, with a patulous lip 

 having a whitish border. The operculum has its polar point rather 

 near to the margin. Gualtierus (tab. 6. fig. G) gives a drawing of a 

 freshwater shell closely resembling this variety. Another variety is 

 rather thinner, diaphanous, horn-colour, and obscurely maculate. 



