1875.] G. & H. Nevill — Descriptions of new Marine Mollusca. 99 



angled at the upper part than the type form ; the transverse grooves and 

 double white band are similar. 



Common at the Andaman I. 



Long. 19, diam. 6f mil. 



M. ckttentata, Ch. var. Sandvichensis. 



Extremely close to the preceding is the form from Ascension I. (Pacific 

 0.) sent to us by Mr. Pease as " M. armillata (?) perhaps cruentata, Ch." 

 This variety is recorded in the ' Donum Bismarckianum' as armillata, Rv. ; 

 from which it differs by the less flexuous ribs and different shape of the 

 whorls, being nearer Reeve's amancla ; it seems to us to be best classed as a 

 variety of cruentata, Ch. : the whorls are not angulate near the suture, the 

 transverse grooves are nowhere rugose but are more or less obsolete in the 

 centre of the last whorl ; a groove at the upper part being more deeply in- 

 cised than the others (in this respect it agrees with armillata), gives the 

 appearance of a row of prominent, bisected tubercles just below the suture ; 

 there are 21 ribs on the last whorl, which are only very slightly flexuous, 

 it has a single white band only. 



Long. 5f, diam. 6 mil. 



M. CKTTENTATA, Ch., var. AMANDA, Rv. 



Reeve's 31. amancla, (fig. 318) from the Philippines is only a variety of 

 this protean species. Specimens dredged abundantly by Dr. Stoliczka at 

 Singapore agree exactly with Reeve's typical figure and description. It differs 

 from cruentata var. proxima by the whorls not being angulate, by a deeply 

 incised groove near the suture, forming a row of oblong tubercles next the 

 suture, by the much greater width of the white bands and by the less vivid 

 orange tinge of the ribs, which are 16 to 20 in number ; and from 

 cruentata var. Sandvicliensis by the more regular and rugose transverse 

 striation and by the broad double white bands ; — it is in fact intermediate 

 between the two. 



Long. 13, diam. 5 mil. 



Two specimens from Aden, unfortunately not in good condition, 

 apparently belong to this variety, the ribs are, however, more distant. 

 Reeve's armillata (fig. 315) from the Philippines, may perhaps prove also 

 to be a variety of cruentata, or it may be a variety of obeliscus, Rv. ; it 

 seems intermediate between the two. 



Mitea (Tukbicula) obeliscus, Rv. var. Andamanica. 



PL VIII, Figs. 19—20. 



Shell slenderly fusiform, shining ; very dark brown with a single very 



narrow white band, more distinct on the ribs than in their interstices ; whorls 



9 — 10 (as in M. cruentata and all its varieties), produced, very slightly 



