1864. | Junkins on Brackish-water Fossils of Crete. 421 
cross at right angles, forming a tubercle at the point of intersection. Base of the 
shell similarly ornamented and slightly umbilicate. Mouth oval; columella 
thickened ; inner lip callous above ; callosity flat, thin, spreading over part of the 
base of the shell above the small umbilicus. 
4. Cerithiwm recticostatum, mili. Figs. 2a, 2b. 
Shell turreted, acute; whorls numerous, slightly convex, ornamented with 
three sharp transverse ridges, crossed at right angles by about ten straight, sharp, 
very prominent, and almost lamelliform varices, which are slightly tuberculated 
at the point of crossing, and also just below the suture, where they are crossed by 
a fourth and very small longitudinal ridge. Mouth oval, effuse at the base, where 
the peristome is prolonged into a pointed spout. 
5. Unio Cretensis mibi. Figs. 8a to 8c. 
Shell very thick and coarse, sub-rhomboidal, with the upper margin convex, and 
the lower almost straight ; anterior extremity rounded, scarcely projecting beyond 
the umbo ; posterior extremity obliquely projecting, very convex, almost pointed, 
ending above in a sharp angular ear; umbo prominent, scarcely eroded. Hinge- 
teeth and lamellee very thick and projecting ; anterior muscular impression very 
deep, much deeper than the posterior. 
II—Descrirtion oF A New Species From CERIco. 
Cerithium Cytherorum, mihi, Fig. 11. 
Shell turreted, acute ; whorls numerous, convex, ornamented with two convex 
transverse bands, which are separated by a sharply-defined shallow groove, and 
are tuberculated where crossed by the varices; varices curved, broad, not very 
distinct ; suture neatly impressed, slightly undulated. Mouth small, nearly 
round ; columella callous, twisted, and somewhat produced, oblique. Base of the 
shell ornamented with about five parallel ridges crossed by distinct lines of growth. 
EXPLANATION OF PLATE. 
Fossits FROM CRETE. 
Fis. la, 1b.—Cerithium Lamarckii. Magnified 2 diameters. From the plain of 
Arkadia. 
a 2a.—C. recticostatum. Natural size. From Kherisoniso. 
« 2b.—C. recticostatum, var. Natural size. From Kherisoniso, 
», 3d, 3b.—Melania? anomala. Magnified 2 diameters. From Kherisoniso. 
»» 4u to 4e.—Melanopsis Bouet. Magnified 2 diameters. From Kherisoniso, 
» 0a, 5b.—Melanopsis buccinoidea. Natural size. From the Plain of Arkadia. 
This species also occurs in Cerigo. 
», 6a to 6d.— Neritina Spratti. Magnified 2 diameters. From Kherisoniso. 
» 1a to7e.—N. abnormis. Magnified 2 diameters. From Kherisoniso, 
», 8a to 8c.— Unio Cretensis. Natural size. From Kherisoniso. 
Fosstts FRoM CERIGO. 
Fias. 9a, 9b.— Cerithiwm plicatum. Natural size. 
x 10.—C. doliolum. Magnified 2 diameters. 
a 11.—C. Cytherorum. Magnified 2 diameters, 
», 12a, 12b.—Neritina fluviatilis. Magnified 2 diameters. 
