LITTORINIDZ. 245 
rounded. The dentition corresponds with that of the Littor- 
inidee. 
Fossarus, Philippi. 
Syn.—Phasianema, Wood. Maravignia, Aradas. Megalom- 
phalus, Brusina. 
Distr.—43 sp., including species of the subgenera. Mediter- 
ranean, W. America, Polynesia, Japan, Red Sea. Fossil, 4 sp. 
Miocene; Europe. YF. costatus, Brocchi (1xix, 39). F. ambiguus, 
Linn. (xix, 40). 
Shell perforated, sculptured; inner lip thin; aperture semi- 
lunate. Operculum not spiral. 
Animal with two frontal lobes between the tentacles. 
1sApIs, H. and A. Adams. Shell umbilicated, spire elevated, 
cancellated or with revolving ribs, columella with a small median 
tooth (almost obsolete in /. anomala). 4 sp. West Indies, 
Mazatlan. Ff. anomala, C. B. Ad. (Ixix, 41). 
FOSSARINA, Adams and Angas. Aperture circular, inner lip 
arcuated. 2sp. Australia. /.patula, Ad. and Angas (lxix, 41). 
courHouyiA, A. Ad., 1860. Shell ovate, profoundly and widely 
rimate; spire acuminate; whorls convex, decussated, with 
impressed sutures; aperture semiovate; inner lip straight, dilated 
in front, outer lip arcuate, simple. Japan. 3sp. F. decussata, 
A. Ad. 
coNnRADIA, A. Ad., 1860. Shell turbinate, rimately umbilicate, 
spire somewhat elate ; whorls convex, carinated concentrically ; 
aperture round the outer margin fimbriate, inner lip without 
teeth ; umbilicus margined by a semilunar rib. 6 sp. Japan. 
F. cingulifera, A. Ad. 
gotromina, A. Ad., 1863. ~Lirate, solid, imperforate. 2 sp. 
Japan. F. sulcifera, A. Ad. 
cirHNna, A. Ad., 1863. Globosely turbinate, thin, whorls smooth, 
umbilicus margined. 2sp. Japan. J. globosa, A. Ad. 
FOSSARIOPSIS, Laube, 1870. Distinguished from Fossarus by 
the closed umbilicus and the callous expansion of the inner lip. 
F. rugoso-carinata, Klipst. Triassic. 
TUBA, Lea. Shell conical, umbilicate; whorls rounded, can- 
cellated; aperture rounded, margin not continuous above ; 
columella thickened and reflected at the base. YF. alternata, 
Lea (Ixix, 43). Eocene; U.S. 
ATRESIUS, Gabb, 1869. 
Distr.—A. liratus, Gabb. Cret.; Cal. 
Shell elongate, spire elevated; whorls rounded; aperture 
ovate, slightly produced in front, outer lip entire, thin; colu- 
mella not callous, imperforate; surface marked by revolving 
ribs. Possibly belongs in Cerithiide. 
