306 TURBINID^. 



rib, and several smaller marginal ribs. 4 sp. W. Coast of 

 America, China, Japan. T. fluctuatus, Grray (Ixxx, 29). 



NINELLA, Gray. Shell turbinated, depressed, rugose, tubercu- 

 lated, umbilicated ; internal lip wide, concave, with a longitu- 

 dinal nacreous excavation near the columella. Operculum with 

 two parallel spiral ribs. Australia, New Zealand. T. torquatus^ 

 Gmel. (Ixxx, 22). 



COLLONUA, Gray. Shell small, thick, turbinated, with revolving 

 ribs or smooth, not umbilicated. Operculum with gradually 

 enlarging whorls, a convex external rib and a central pit. 

 Recent and tertiary. T. sanguineus, Linn. (Ixxix, 12). 



ANADEMA, H. and A. Adams. Shell conoidal-depressed, whorls 

 with revolving series of granules ; umbilicus with a spiral callus, 

 which enlarges and joins the outer lip ; columella terminating 

 anteriorly in one or two tubercles. T. MacAndrewi, Morch 

 (Ixxix, 13). 



The following genera, recently described by de Koninck, 

 might be referred, with perhaps equal propriety, to other groups. 



TuRBONiLLiNA, dc Koninck, 1881. 



Distr. — Devonian, Carb. ; Europe. T. lepidus, de Kon. 



Shell small, depressed orbicular ; umbilicus funnel-like ; spire 

 short ; whorls convex, finely spirally ribbed ; mouth oval, inner 

 lip not thickened. 



PoRTLOCKiA, de Koninck, 1881. 



Distr. — 10 sp. Devon, to Carb. ; Eur. P. parallela, Phil. 



Turbiniform, imperforate ; spire somewhat elevated ; whorls 

 convex, with fine spiral ribs, some becoming stronger on the last 

 whorl ; mouth oval, inner lip arched, not thickened. 



AocLisiNA, de Koninck, 1881. 



Syn. — Turbonilla, Geinitz. 



Distr. — A. ( Murchisonia) sfriatula, Kon. Carb. 



Small, lengthened-conical, imperforate ; whorls convex, spirally 

 striate ; mouth oval, outer lip sharp, columella slightly thick- 

 ened, not arched. 



? PiTHODEA, de Koninck, 1881. 



Distr. — 2 sp. Carb. ; Belgium. 



Shell large, thin, ovate, imperforate; whorls rapidly increasing, 

 somewhat dissimilarly, spirally ribbed, with a median smooth, 

 transversel}'^ striated band ; mouth large, ovate. 



TuRBONiLOPSis, de Koninck, 1881. 



Distr. — 2 sp. Carb.; Europe. 



Small, depressed, smooth, umbilicated ; umbilicus surrounded 

 by a Callous thickening. 



