48 MIMA. 



X. PERTTREMIA, Tenison- Woods. PI. is. fig. f)7i. 



Milky white, subpcllucid, shining. Length, 7 mill. 



Port Jack*on., 

 N. CONCENTKK'A, Marrat. PL 15, tig. 260. 



Greyish, with two l)rown bands; bcjwled at the sutures, closely 

 ribbed, impressed with revolving lines at the base. 



Length, Mif) ineli. 



Habitat unknown. 



A doubtful species founded upon a tignre in "Reeve's Ironica 

 intended for N. coitciimti . Powis which it is not. 



X. RISSOIDKS, Man-at. PI. IT), fig. ^f>:>. 



Sliell white. Length, \">f> inch. 



Habitat unknoirit. 



Much more slender than tlie ty])ical X. pan /tern, yet I doubt 

 its distinctness. I have before me a single specimen wliich is 

 just intermediate between the two forms. 



X. KXI.MIA. 1L Adams. PI. IT), tig. 2.~>7. 



Cancellated by very close, small longitudinal and revolving 

 lines; light yellowish In-own, with three ple brown revolving 



bands. Length. S mill. 



\t <r I [thrill?* ; Viti- lxlti-i1* -A. Garrett. 



Still more pnpiform than A r . p(ni]>er<i, and smaller, -with iniK'h 

 liner sculpture. A', ptixilla. Mtirrat, an nntignred sju-cics from 

 , is probably (judging from the description) identical. 



X. CONVINNA, Powis. PI. 1;>. figs. :>.M;, i>:.S-i>.V.l. 



rioselv cancellated, with an impressed line at the suture. 

 <lividing otl'a single row of grannies. Length. Mifi-'S inch. 



Pnlunexiu ; Australia. 



In form, sculjtture and coloring like the preceding species, but 

 differing greatly in bulk. A. <-n'l>ril i m-tihi . llombr. and Jacij. 

 (I'm 1 . J.'iS). :ind jin>b:ibly A'. i>nl<'/n'rrim(i. MaiTat (Jig. ii")'.l ). :in- 

 synonyms. 



X. INTKKUKATA. Iv A. Smith. PI. 1.'). fig. -2(')1. 



\Villi spiral line in the interstices of the Longitudinal riblets. 

 Drk brown, blackish beneath the suture^. Length. i\") mill. 



-.': 



