434 



to Mangilia thalia, described (Proc. Zool. Soc. Lond. 1901, p. 445, PI. 24, fig. 10) as a ClatJmrella, 

 but though it may have some resemblance, it differs in many particulars. 



13. Mangilia crassicingulata n. sp. PL XXIX, fig. i, 



Stat. 51. Madura-bay. 69—91 M. Fine grey sand, coarse sand with shells and stones, i Spec. 



Shell pyramidal, with very short canal, thin, semipellucid, reddish-brown with a white 

 zone at the shoulder, a white canal, ribs and part of spirals. Whorls 11, of which about 3 

 form the nucleus, with very deep suture, the uppermost whorl smooth, the other ones with a 

 conspicuous keel ; post-nuclear whorls very convex, with a deep, waved suture. Sculpture con- 

 sisting of remote, rounded, axial ribs, 9 in number on last whorl and numerous spiral lirae, 2 

 narrow ones below the suture, 5 strong ones on penultimate whorl, of which the upper 2 border 

 the white zone and are white themselves, the 5'^ is very strong, but falls in the suture of upper 

 whorls, forming the strong spiral rib on last whorl, which suggested the name, accompanied 

 by a narrow one ; below this the shell is rapidly contracted, with only faint spirals, but divided 

 by the ribs, which produce beautiful excavations in their interstices (reminding those of Clath. 

 cavernosa^ ; canal with a few stronger lirae ; moreover the shell is sculptured by conspicuous 

 growth-lines, as well on the ribs as in their excavated interstices and a few intermediate lirae, 

 producing on the whole shell a fine cancellation. Aperture oval, rounded above, with a short, 

 open canal below, peristome thin, with a rather deep sinus above, columellar margin nearly 

 straight, with a conspicuous layer of enamel, not appressed, leaving an umbilical chink; interior 

 of aperture with a few lirae. 



Alt. 14Y2, lat. 5; apert. alt. 3^6, lat. i^/a Mill. 



This species has some resemblance with a very elongate Phos senticosiis^ but is of course 

 quite different. Perhaps it might as well be located in ClatJmi^ella on account of its sculpture 

 and aperture, but it appears that it is more allied to some species of Mangilia. 



14. Mangilia halmaherica n. sp. PL XXIX, fig. 2. 



Stat. 137. Between Makjan and Halmahera. 472 M. Fine, dark muddy sand. 4 Spec. 



Shell fusiform, with rather short canal, pellucid, white. Whorls about 8, of which about 

 3 form the nucleus, which is large, convexly-whorled, at first smooth, then axially ribbed; post- 

 nuclear whorls angular, concave above. Sculpture consisting of rather narrow axial ribs, about 

 12 or 13 on last whorl, crossed by spirals, of which one more or less strong one, just below the 

 suture, another at the angle and one or two on the lower part; last whorl with canal, with about 

 1 2 spirals, those on the upper whorls and 5 upper ones on last whorl are sharply tubercled 

 in passing the ribs, those on the contracted part of last whorl and canal, more plain ; moreover 

 the whole shell is covered with fine growth-lines. Aperture elongately-oval, angular above, with 

 a rather short, wide canal below; peristome thin, with a moderately deep sinus above, colu- 

 mellar margin slightly concave above, directed to the left below. 



Alt. 7^1, lat. 3 ; apert. alt. 3Y3, lat. i Mill. 



70 



