TURBO. 215 



(Trans. Roy. Boc. S. Australia, ix, p. 125) gives priority to gruneri, 

 "Philippi in Zeitschrift fur Malalc, p. 98." The species was never 

 published in the Zeitschrift. 



The operculum is unknown to me; the species may perhaps be 

 found to group elsewhere. 



Subgenus Marmorostoma Swainson, 1840. 



Shell depressed-turbinate, very solid, deeply and widely umbili- 

 cate (except . in T. coronatus), smooth, lirate or nodulose; spire 

 depressed, of few whorls; aperture round, produced but not chan- 

 nelled at base. Operculum circular, nucleus subcentral, outside 

 convex, smooth or granulose. 



Anstralo- Zealandic Province. 



T. roRPHYRiTEs Martyn, 1784. PL 50, fig. 58. 



Shell depressed-turbinate, solid, umbilicate, greenish or blackish, 

 irregularly marked with maculations and angular patches or with 

 spiral bands of white and dark ; spire depressed, obtuse ; Avhorls 5, 

 the upper ones frequently carinate ; suture subcanaliculate, or often 

 scarcely at all impressed, sometimes bordered below by a series of 

 obsolescent undulations; upper whorls spirally striate or granulate, 

 the sculpture becoming obsolete on last whorl but sometimes re- 

 appearing around the base; last whorl somewhat descending, large ; 

 aperture oval, angulate above and below, white and iridescent 

 within, frequently margined with greenish ; parietal wall frequently 

 excavated or callous; broad, somewhat flattened below the deep 

 narrow umbilicus, dilated and produced or rostrate at base. 



Alt. 35, diam. 40 mill. 

 Indian 0.; Philippines; Neio Caledonia; Solomon Is.; Australia, etc. 



Operculum (pi. 60, fig. 49) inside flat, with five whorls and sub- 

 central nucleus; outside very convex, white, the outer part green, 

 obsoletely granulose, nearly smooth. 



This is T. versicolor, mespilus, ludus and porj^hyrites Gmel. T. 

 lugubris Kiener (PI. 50, fig. 57). T. versicolor Rve. (pi. 42, fig. 39,) 

 is somewhat intermediate between porjihyrites and porcatus. 



T. mespilus is said by Fischer to be thinner, more uniform in 

 color, more rostrate at base, last whorl more descending; but all the 

 characters are so variable that I cannot draw the line between the 

 several forms. 



