86 MALONE JURASSIC FORMATION OF TEXAS. [bull. 26€ 
Measurements. — Height, 23 mm.; length, 53 mm.; breadth, 14 mm 
Beaks placed at 30 mm. from the anterior extremity. 
Occurrence.— Right specimens from locality 1J miles east of Ma 
lone station. 
ANATINA? PLICULIFERA Sp. 11. 
PI. XVI, figs. 9, 10. 
Shell of small medium size in the genus, oblong, anteriorly rounded 
posteriorly truncate, strongly compressed, moderately gaping ai 
anterior and posterior extremities; the posterior region relatively 
little contracted; beaks low, narrowly compressed with the shell 
itself, situated about at (he posterior limit of the anterior third of th< 
shell; surface ornamented with strong, subequal, concentric plicull 
and grooves. 
Measurements. — Height. i >( .) mm.: length, 11) mm.; breadth, 14 mm 
Occurrence. — A mile and a half east of Malone station. Repre 
sented by only one specimen. 
There is some appearance of an anterior radial angulation of th< 
shell, directed forward and downward to the anterior extremity; bj 
the condition of preservation of the type is such as make? it impos 
sible to determine whether this is really a feature of the shell or not. 
Genus THRACIA Leach. 
Thracia? malomaxa sp. n. 
pi. xix, fig. 6. 
Shell very thin, inequilateral, compressed, commonly about th< 
size of Thracia incerta Agassi/." sometimes larger, inclined to b< 
more posteriorly produced, or heel-like, at the lower anterior border 
trapezoid-ovate ; posterior side narrowly gaping in the upper part 
beaks of moderate size and elevation, situated about as in th( 
T. incerta, their posterior slope angulated; surface marked wit! 
parallel, moderately elevated, compressed linear, or cariniform, con 
centric plicules separated by partly equal and partly unequal inter 
vals of two or three times their own width. 
Measurements. — Of considerably the largest example, height, 4* 
mm.; length, about 60 mm.: breadth, about 20 mm. Of a more com 
moii size, height, 37 mm. ; length, 49 mm. ; breadth, IS mm. 
Occurrence.— Six specimens, all casts, two of which show char- 
acteristic traces of the markings, were collected 11 miles east O'J 
Malone station. 
"As figured in Zittel's Handtmeh, vol. ."., fig. 186. 
