214 MR. E. A. SMITH ON MOLLUSCA FROM JAPAN. [Feb. 18, 



(Dr. Livesay), and Louisiade archipelago {Maegillivray, Voyage of 

 ♦Rattlesnake'). 



80. MiTRA (Costellaria) stjbtrtjncata, Sowerby. 



Mitra subtruncata, Sowerby, Thesaurus Con. iv. pi. 360. f. 405, 

 sp. 468. 



Hab. Ooshima harbour, 8 fathoms, on a bottom of sandy mud 

 and broken shells. 



Mr. Sowerby remarks that in sculpture this species resembles M. 

 obeliscus. Judging from his figure and the specimens which I be- 

 lieve to belong to this form, this statement requires some qualification. 

 To a certain extent there is some similarity ; but the costellae in J/. 

 obeliscus are finer and more numerous, and the spiral sulci between 

 them much deeper than in M. subtruncata. The ribs, too, in the 

 former are subgranulous at the points where the spiral lirse between 

 the sulci come into contact with them, whilst in the latter they are 

 smooth and regular. The columella has five plaits, M. obeliscus 

 only four. 



81. Mitra (Costellaria) rusco-APiCATA. (Plate XX. fig. 49.) 



Mitra {Costellaria) suluensis. Smith (non Ad. and Rve.), Annals 

 and Mag. Nat. Hist. 1875, xv. p. 425. 



Shell fusiform, whitish, stained with brown at the apex, obscurely 

 banded with bluish ash a little below the top of the whorls, and 

 spotted irregularly with brown in the same part, generally between 

 the costae ; lower half of the last whorl cinereous brown. Whorls 10, 

 one to two apical ones smooth, globose, the rest almost flat at the 

 sides, scarcely turreted, longitudiually ribbed and spirally sulcated 

 between the costse ; the latter are about 17 in number on the penul- 

 timate whorl, a little arcuate and oblique, about half as broad as the 

 interspaces between them ; spiral sulci interrupted by the costie, 

 five on the upper whorls, moderately deep, subequidistant : the 

 ribs on the body-whorl alternate at the base, and at this part are cut 

 across by the oblique transverse grooves, producing nodules upon 

 tliem ; one of the ridges between the sulci, which is in a line or con- 

 tinuous with the uppermost fold on the columella, is conspicuous, 

 being a little thicker than the rest. Aperture generally internally 

 lirate, small, narrow, witli a white band within a little above the 

 middle, and two interrupted brown zones, one above and the other 

 below the white one ; columella with a callus near the extremity of 

 the labrum, with four folds, the two uppermost grooved so as to 

 appear duplex; canal recurved. 



Length 24 millims., diam. 7 ; aperture 9 long, 2 wide. 



Hab. Station 19. Ooshima harbour (Annals 187.5). 



This species is closely allied to M. suluensis, Ad. and Rve., with 

 which I formerlly confounded it ; it differs in having a non-turreted 

 spire, finer spiral sculpture, a shorter aperture, and the colour, too, 

 a little different. The bluish-ash zone at the upper part of the 

 ■whorls in some specimens is almost entirely wanting, so that the 



