306 TURBINIDA. 
rib, and several smaller marginal ribs. 4 sp. W. Coast of 
America, China, Japan. T. fluctuatus, Gray (1xxx, 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). 
cOLLONIA, 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. 7. sanguineus, Linn. (1xxix, 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. Z. MacAndrewi, Morch 
(xxix, 13). 

The following genera, recently described by de Koninck, 
might be referred, with perhaps equal propriety, to other groups. 
TURBONILLINA, de Koninck, 1881. 
Distr.—Devonian, Carb.; Europe. 7. lepidus, de Kon. 
Shell small, depressed orbicular; umbilicus funnel-like; spire 
short; whorls convex, finely spirally ribbed; mouth oval, inner 
lip not thickened. 
Porriockia, de Koninck, 1881. 
PDistr.—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. 
Acciisina, de Koninck, 1881. 
Syn.—Turbonilla, Geinitz. 
Distr.—A. (Murchisonia) striatula, Kon. Carb. 
Small, lengthened-conical, imperforate ; whorls convex, spirally 
striate; mouth oval, outer lip sharp, columella slightly thick- 
ened, not arched. 
? PrrHopEA, de Koninck, 1881. 
Distr.—2 sp. Carb.; Belgium. 
Shell large, thin, ovate, imperforate; whorls rapidly increasing, 
somewhat dissimilarly, spirally ribbed, with a median smooth, 
transversely striated band ; mouth large, ovate. 
TURBONILOPSIS, de Koninck, 1881. 
Distr.—2 sp. Carb.; Europe. 
Small, depressed, smooth, baad Tage eth umbilicus surrounded 
by a callous thickening. ; 
