TROCHOMORPHA. 121 



elevated, obtuse. Suture simple. Whorls 6, the first slightly con- 

 vex, the rest flat, slowly increasing, the last a little wider than the 

 penultimate ; rather swollen around the umbilicus, obtusely angu- 

 lated, not descending in front ; aperture subtriangular, depressed ; 

 peristome simple. Umbilicus large, perspective, one-third the 

 diameter. 



Alt. 3, greater diam. 15, lesser 13;> mill.; diam. of umbilicus 5 

 mill. (Hid.) 



Mt. Cabugao at Looc, and Paragua, Tab las ; Philippines. 



Tr. loocensis HID., Journ. de Conchol. 1887, p. 115, t. 4, f. 4; 

 Obras Malacol. i, p. 21, 115. 



T. METCALFEI Pfr. Vol. Ill, pi. 17, figS. 17, 18 19. 



From this species as defined by Pfeiffer and by Tryon (Man. iii, 

 p. 85) must be separated the varieties "minor'' and " -unicolor" 

 which have properly been defined as distinct species by v. Mo'lleu- 

 dorff, under the names T. repanda and T. granulosa. 



The typical METCALFEI is rather large (alt. 65, greater diam. 20, 

 lesser 18 mill.), of a corneous tawny color, with conspicuously white 

 suture and keel, the latter bordered above and below with a broad 

 tawny-brown band. The surface of the base is finely and beauti- 

 fully cut by microscopic spirals, except around the umbilicus where 

 it is more shining ; the upper surface is slightly duller and lacks 

 spiral lines. The umbilicus measures one-fifth the greater diameter 

 of the shell. The last whorl generally descends a trifle below the 

 keel in front. 



It is very closely allied to T. sibuyanica in form, but rather less 

 depressed, and conspicuously banded. It is a much larger shell than 

 T. repanda. T. granulosa differs in being unicolored and strongly 

 decussated above. 



T. SIBUYANICA Hidalgo. PI. 20, figs. 17, 18, 19. 



Shell discoidal, depressed, acutely carinated, rather thin, sub- 

 translucent, pale brownish- corneous-buff. Umbilicus perspective, its 

 width contained 5-5a times in the diameter of the base. Surface 

 slightly shining above and marked with light growth-stride; hav- 

 ing a bright oily luster in the middle below, the outer half being 

 duller and distinctly spirally striated below the keel. Spire low, 

 depressed; whorls 6, the inner 2 convex, the rest flat, and separated 

 by a non-impressed white suture ; last whorl concave above and 

 below the acute white-edged keel. Aperture very oblique, ax-shaped, 



