490 C. Rk. EASTMAN 
Diplodus priscus sp. nov. (Pl. VII, Figs. 1, 2) 
Teeth minute; the two principal cusps of dental crown divergent and 
slightly inclined backward, robust, conical, round in section, without lateral 
carinae; coronal surface marked with relatively few, prominent, slightly 
curved striae extending from the base nearly to the extremities on the anterior 
face, but shorter and usually fainter on the posterior face. Median denticle 
slender, sometimes much reduced, or in one specimen apparently wanting 
altogether. Anterior border of root slightly produced downward ; lower surface 
concave, elliptical in outline ; posterior button present. 
About a dozen examples (chiefly fragmentary) of this spe- 
cies were obtained by Mr. Weller, the largest of which has a 
total height of 8mm. One fragment, consisting of the root 
only, has an elliptical, concave base, with axes measuring 5 mm 
and 7mm; a similar but smaller root has axes of only 2mm 
and 3mm respectively. Each of the cones shown in Fig. 2 has 
eight vertical striae on the anterior face, but if any were present 
on the posterior face, they occurred higher up than on the part 
preserved. The length of the median denticle is conjectural, as 
the tip is missing from all specimens. The intermediate space 
is occupied by a groove in the tooth shown in Fig. 2, and to all 
appearances no denticle was present here. This, of course, must 
be looked upon as an exceptional variation. 
Diplodus striatus sp. nov. (Pl. VII, Figs. 3, 4) 
Of this species only a few fragments were obtained by Mr. 
Weller, the largest and most perfect being shown in the accom- 
panying figures. It attains apparently about twice the size of 
the preceding form, and is readily distinguished by its finer stri- 
ation, shallower root, and somewhat compressed section of its 
principal cones. The striae on the anterior face all curve uni- 
formly in a spiral direction (Fig. 4, left-hand figure), but on the 
posterior face the tendency is to curve outward on either side of 
the median line to the lateral margin of the cones, where they 
terminate, exactly as in some species of Cladodus (e. g., C. striata- 
tus Ag.). This condition is partially indicated in the right-hand 
illustration of Fig. 4, but other specimens show it more dis- 
tinctly. One or two fragmentary cones have the striae less 
