TURRITELLID. 225 
not reflected in front, outer lip somewhat thickened within. 
T. lanceolata, Reeve (1xvii, 61). 
MATHILDA, Semper, 1865. Shell turriculated, apex revolute, 
abruptly turned from left to right; whorls in the typical species 
transversely cingulated and reticulated, longitudinally striated ; 
aperture entire, subrotund, base sometimes subeffuse ; lip acute; 
columella smooth. TZ. cochleformis, Brugn. (lxvii, 62). Med- 
iterranean; and several fossil species. Jurassic—; Europe, 
United States. 
GLAUCONIA, Giebel, 1852. Shell turriculated, subulate ; aper- 
ture small, rounded, peristome continuous, forming a posterior 
angle. Fossil. Z. Maraschini, Defrance (xvii, 63). 
CASSIOPE, Coquand, 1866. (Omphalia, Zekeli, 1852 [not Om- 
phalius, Phil.]. Proto,authors,not Defrance.) Shell thicker, and 
with more rapidly increasing whorls than in Turritella, often 
pupiform ; aperture rounded, continuous; outer lip notched or 
sinuated by an impressed furrow, which winds round the last 
whorl; columella usually distinctly umbilicated. There are 30 
cretaceous species. Europe, India and America. C. Reneviert, 
Coquand. 
ARCOTIA, Stoliczka, 1868. Shell turreted, elongated, somewhat 
thickened ; whorls spirally striate; incremental strie straight, 
not sinuated ; columella excavated ; aperture angulately rounded, 
subeffuse anteriorly. TJ. Indica, Stol. (xvii, 64. Jurassic 
and Cretaceous; India. 
Protoma, Baird, 1870. 
Distr.—P. Knockeri, Baird. Whydah, W. Africa. 
Shell turreted, aperture oval, narrowly excised at the base. 
Operculum circular, corneous, multispiral. 
The operculum shows this to belong to the Turritellide, 
although the aperture of the shell is more like that of Terebra. 
Lituorrocuus, Conrad. 
Approaching Mesalia, but without the produced basis of the 
last whorl of that genus. There is a thickened sutural band, 
with very numerous growth-strie. Has much the appearance of 
an elongated Trochus. Liassic. L. Humboldtii, Buch. (1xvii, 
65, 66). South America. 
CocHLEARIA, Munster. 
Syn.—Chilocyclus, Braun. 
Distr.—2 fossil sp. Triassic; Austria. C. carinata, Bronn 
(xvii, 67). 
Shell turriculated, thick; aperture rounded, peristome con- 
tinuous, widely and flatly reflected all around. 
Zittel considers this a group in the family Scalaride. 
