48 HIMA. 



X. PERTTREMIA, Tenison-Woods. PI. 18, fig. 571. 

 Milky white, subpellucid, shining-. Length, 7 mill. 



Port Jackson, Australia. 

 N. CONCENTRICA, Marrat. PL 15, fig. 260. 



Greyish, with two brown bands ; beaded at the sutures, closely 

 ribbed, impressed with revolving lines at the base. 



Length, *65 inch. 



Habitat unknown. 



A doubtful species founded upon a figure in Reeve's Icoiiiea 

 intended for N. conchina, Powis which it is not. 



N. RISSOIDES, Marrat. PI. 15, fig. 253. 



Shell white. Length, '55 inch. 



Jfabitat unknown. 



Much more slender than the typical N. pa,upera, yet I doubt 

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

 just intermediate between the two forms. 



N. EXIMIA, H. Adams. PI. 15, fig. 257. 



Cancellated by very close, small longitudinal and revolving 

 lines; light yellowish brown, with three pale brown revolving 



bands. Length. 8 mill. 



JYV/r Hebrides ; Viti Islands A. Gam 



Still more pupiform than ^V. paupera, and smaller, with much 

 finer sculpture. N. pusi-lla, Marrat, an nnfigured species from 

 Singapore, is probably (judging from the description) identical. 



N. CONCINNA, Powis. PI. 15, figs. 250, 258-259. 



Closely cancellated, with an 'impressed line at the suture, 

 dividing oft' a single row of granules. -Length, '(tf-'H inch. 



Polynesia ; Australia. 



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

 differing greatly in bulk. X. crebrilinedta, Hombr. and Jacq. 

 (fig. 258), and probably X. pulchr.rrima, Marrat (fig. 259). are 

 synonyms. 



N. INTERLIRATA, E. A. Smith. PL 15, fig. 201. 



With spiral line in the interstices ol the longitudinal riblets. 

 Dark brown, blackish beneath the sutures. Length. C>-5 mill. 



$au Christ.it ml, Solomon 



