GARRETT: ON POLYNESIAN MITRID^. 27 



more abbreviated form and the peculiar intercostal laminae- 

 like stria;. 



52. Mitra serpentina Lamarck. Reeve, Conch. Icon., pi. xv., 

 fig. 112a. \i2b. 



A rare and very beautiful species, of which we found a 

 single dead, but very perfect example on the Kioa fringing 

 reef, Viti Islands, and several more or less perfect ones in 

 the Panmotu group. All the Mitres of this peculiar type 

 burrow in sand. 



Our shells are a little smaller than Reeve's largest figure, 

 and have one columellar plait less than stnted by the above 

 author. The color is creamy-white, with two light orange 

 bands on the body whorl, and ornamented with longitudinal 

 more or less waved ferruginous lines and spots, which are 

 most conspicuous on the bands, where they have white 

 shadows. 



53. Mitra sphasrulata Martyn. Reeve, 1. c, pi. v., fig. 37. 



This fine species is generally diffused throughout 

 Polynesia, and, excepting the Society Islands, occurs spar- 

 ingly at all the groups. At Raiatea, one of the former group, 

 it is so very abundant that I collected about 1500 specimens 

 in a few days. Though very common in that particular 

 locality, it is not by any means abundant elsewhere. They 

 Hve in sand in the upper region of the laminariam zone. It 

 appears to be absent from the Marquesas Islands. 



They vary considerably in the size of adults, but not 

 much in colour. The sculpture is remarkably uniform. It 

 may be readily distinguished bv its buff"-colored aperture. 



54. Mitra spiripuncta sp. nov. 



Shell acuminately turreted, slender, white, tinged with 

 rose-red and spirally dotted with light brown, the dots con- 

 fined to the ridges ; whorls 9, spirally ribbed, the ribs 

 slightly crenulated, four on the upper and fourteen on the 



