40 TROCH03. 



T. kochii Phil., Abbild. u. Beschreib, i, t. iv, f. 8, 1844. Fischer, 

 Coq. Viv. p. 120 T. listen Kiener, Species, t. 39, f. 2, (non 

 Wood). 



A distinct, well-marked form. The broadly concave base, round- 

 ed-periphery, etc., sufficiently characterize it. 



T. CONCAVUS Gmelin. PL 43, fig. 13. 



Shell false-umbilicate, regularly conic, concave below ; color 

 greenish and roseus, under' a dull grayish-green cuticle ; outlines of 

 spire nearly rectilinear ; whorls 7 to 8, planulate, very obliquely 

 striate, radiately corrugated, and covered with a very minute 

 secondary sculpture of radiating, fine, close wrinkles; last whorl 

 acutely carinated at the periphery ; base concave, concentrically 

 lirate, the line about 6 to 8 in number, granose in the young, nearly 

 smooth in the adult ; aperture very oblique, covering half the base, 

 outer lip crenulated by the folds of the outside; basal margin 

 straight, thin, simple ; columella oblique, with a strong fold above, 

 projecting into the aperture, insertion very deep parietal Avail lirate; 

 umbilical tract white or yellowish, spirally costate in young, smooth 

 in fully adult specimens. Alt. 35-40 diam. 45-47 mill. 



Indian 0. ; Seychelles ; Madagascar, etc.. 



T. concavus GMEL., Syst. Nat. xiii, p. 3570, no. 21. and of 

 authors generally. 



A very distinct form, with aperture so oblique as to resemble a 

 Calyptraea. 



Section INFUNDIBULOPS Pilsbry, 1889. 



T. ERYTHR^EUS Brocchi. PL 5, figs. "32-35. 



Shell conical, false-umbilicate, rather thin and inflated ; apex acute ; 

 whorls about 7, somewhat concave and generally traversed by 

 several conspicuously granose line in the middle, a little gibbous above 

 and below, obliquely undulate below the sutures, and frequently on 

 the periphery also, the whole surface more or less finely spirally 

 lirate, the lirse subgranulose ; base convex, concentrically lirate 

 with about 7 granose narrow lirse, their interstices generally occupied 

 by cencentric strise ; color cinereous grayish or pinkish, striped and 

 maculated above with reddish; unicolored pinkish or radiately mark- 

 ed below; aperture large, smooth and pearly within, the basal lip 

 simple ; columella oblique, very deeply inserted, its entire edge 

 nearly straight, not dentate ; umbilical tract deep, narrow, pearly, 



