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



number, the three apical ones being very much rounded and mi- 

 nutely reticulated by raised lines, oblique in opposite directions. This 

 oblique reticulation is found in Defrancia as limited by Jeffreys 

 (Brit. Conch, iv. p. 361), and also in Daphnella of Hinds. 



36. Daphnella fragilis, Reeve, var. 

 Pleurotoma fragilis. Reeve, Con. Icon. sp. 179. 

 Var. = P. lymncBceformis, Rve. Con. Icon. sp. 325. 



Non P. hjmneifonnis, Kiener, Coq. Viv. p. 62, pl. 22. fig. 3. 



Hab. Philippine Is. {Reeve). 



The Japanese specimen is much smaller than the type of this 

 species, having a length of only 10 millims. However, in form and 

 sculpture the differences are but very trifling. Its spire is certainly 

 less acutely conical, and the reticulation of the surface proportionally 

 coarser, in these respects approaching Baj)hnella interrupta of Pease 

 (Proc. Zool. Soc. 1860, p. 147), a Sandwich-Island form. In truth 

 the gradation from one species to the other is so subtle, that I fail at 

 ])resent to perceive any other differences except of size, stoutness of 

 the spire, and the solidity of the labrum in interupta. 



37. Mangilia ROBtisTicosTATA. (Plate XIX. fig. 28.) 



Shell ovately fusiform, light brown, whitish at the base of the 

 \)ody-whorl and labrum. Whorls 6 ; the apical one and half 

 the succeeding forming the nucleus, globose, large, smooth ; the 

 rest turreted, angulated at the upi)er part at a short distance from 

 the suture, beneath the angulation, which is rounded, sloping inward, 

 so that they are much narrower at the lower part than at the angle, 

 obliquely costate, and striated by the incremental lines ; costse 

 very thick (12 on the jjcnultimate whorl), subacute at their edge, 

 and almost adjacent to one another at their bases, thinner and at 

 times sublamellar at the upper extremities, and very obliquely 

 flexuous from the angle downwards ; on the last volution they gra- 

 dually become obsolete below the middle. Aperture small, livid 

 brown within, except near the lip, where it is whitish ; labrum thin 

 at the extreme edge, strengthened exteriorly by the last well-developed 

 costa, which is white with a single livid-brown spot a little below 

 the middle ; sinus scarcely discernible ; columella smooth, slightly 

 oblique, subrectilinear, covered with a thin callosity which unites at 

 the upper extremity with the termination of the labrum ; canal 

 very short. 



Length 6J millims., width 2g. 



Hab. Japan. 



This species, like the British M. septcuiyiilaris, exhibits but a very 

 small sinuation in the labrum. 



38. Lachesis japonica, A. Adams. (Plate XX. fig. 29.) 

 Lachesis japonica, A. Ad. Ann. & Mag. Nat. Hist. 1860, vol. 



V. p. 4 1 1 . 



Hab. Station 2. " Off Mino-Sima, 63 fms." {A. Ad.). 



The largest specimen of this species in the Museum is 12 millims. 



