MOLLUSC A. 73 



granules alternating with others very much liner, having smaller 

 and subobsolete tubercles. The aperture is obliquely subquadrate, 

 Columella a little arcuate at the upper part, white, reflexed over 

 the white umbilical region and subtruncate anteriorly. Height 

 12 millim., diam. 9| ; another specimen is 13 high, and 12 in 

 width. 



Bub. Prince of Wales Channel, Torres Straits. 



There are two varieties of ibis pretty species, which may be 

 termed the green and pink. The former is represented by four 

 specimens in the Museum (three belonging to the Cumingian col- 

 lection) and the latter by two, which fact, however, can hardly be 

 accepted as indicating the relative abundance of the two forms. 



In the green variety the base in three out of the four examples is 

 somewhat pinkish, radiately streaked with white, whilst in the 

 fourth specimen it is green with irregular streaks and has a more 

 tessellated aspect. The perforation is small, and may cither be con- 

 cealed by a thin callosity or remain open. 



This is a smaller species than T. fragum (Phil.), has more nume- 

 rous granules (of which there axe Jive instead of four rows, besides 

 the basal girdle), and intervening fine lira; are generally to be met 

 with on the spire, which are wanting in Philippics shell. I should 

 also observe that the columella of T. fragum, judging from the 

 figure, is less incurved than in this form. 



93. Troclms (Monilea) lifuaua. (Plate YI. figs. B, B 1.) 



Fischer, Journ. tie Con. 1878, vol. xxvi. p. G3. 

 Monilea lifuana, Fischer, I.e. 1870, vol. xxvii. p. 30, pi. 3. fig. 5. 

 Troclms lifuanus, Fischer in Kicncr's Coq. Viv. p. 3^8, pi. 110. 

 fig. 4. 



Shell suborbicular, only slightly elevated, moderately thick, nar- 

 rowly umbilicated, spirally lirate and striated throughout, and 

 marked with rather distinct lines of growth, pinkish white, varied 

 with large brownish blotches and transverse lines articulated with 

 white and dark purplish brown. Whorls 5|-0, convex, separated 

 by a deepish suture. Last whorl compressed, convex and concen- 

 trically striated beneath, obtusely subangled at the peripherv. Spire 

 not much elevated, having slightly convex outlines. Umbilicus 

 narrow, perforate to the apex, margined with a thickened spiral 

 white or spotted callus and furnished with a second more elevated 

 one within, which terminates on the columella in a lateral yellowish 

 projection. Aperture quadrately subcireular, oblique, only thinly 

 nacreous within. Columella oblique, arcuate, thickened by the ends 

 of the two spiral callosities of the umbilicus and slightly reflexed. 

 Outer lip (viewed laterally) obliquely excurved above the periphery 

 and broadly sinnated beneath. Height G| millim. ; greatest dia- 

 meter 9, smallest 7§. 



Hub. Prince of Wales Channel, Torres Straits, 7 fms. 



The colouring in the two specimens from this locality is very 

 similar, differing only in the amount and size of the blotches, which 



