78 MALONE JURASSIC FORMATION OF TEXAS. [bull. 266. 
Cyprina ? STREERtrviTZii Cragin. 
PI. XIV, figs. 1, 2; PI. XV, fig. 1. 
Cyprina (Roudairia?) streeruintzii Cragin, 1893, Fourth Ann. Rept. Geol. 
Survey Texas, pt. 2, p. 180, PI. XXXVI, figs. 3 to 5, and PI. XL, fig 2. 
Cyprina streeruvitzii has been found only in the Theta, and can 
hardly be called an abundant fossil. Notwithstanding its large size 
and the fact that special search was made for it at its type locality, 
H miles east of Malone station, the most prolific lamellibranch field 
known in the Malone formation, only 11 incomplete specimens and 
casts were found, and none of these is as good as the specimen col- 
lected there by Mr. Wyschetzki, the topographer of Mr. Von Streerul 
witz's party, in 1890. They wen 4 all, or nearly all, obtained from 
the west slope of the Truncate mound. 
They add little to our knowledge of the species. 
The cast, owing to its narrow, very elevated, and strongly arched 
beaks, bears considerable resemblance to that of Cyprina texarm 
Conrad. Its posterior area is outwardly bounded by an obtusely 
compressed, prominent ridge, interior to which is a round-bottomed 
sulcus, followed by another radial elevation and depression within. 
The casts of the anterior adductor scar are exceedingly prominent. 
An undersized though apparently normally proportioned cast has 
the height 73 mm.; breadth, 64 mm., and length approximately 
80 linn. The largest example of the shell has the beaks broken oif. 
hut has a length of about 124 mm. Another specimen of the shell 
presents a height of about ion mm. 
Attached to some of the specimens by the stony matrix are char- 
acteristic parts of Trigonia vyschetzkii, T. proscabra, Lima interi 
Jineata, Astarte breviacola, Mytilus nuntius, Serpula gordial/'s, and 
other fossils. 
There remains some doubt as to the genus of this shell, as the 
hinge characters have not been observed. The following is tht 
original description of the species: 
Slid] large, triangular, the anterior and posterior sides of the outline being 
subdirect, the basal convex, height and length of shell about equal, exceedinl 
the breadth; beaks prominent, situated somewhat in advance of the middle, 
posteriorly flattened or concave, their summits turned inward and forward 
till tangent or subtangent above the downward, outward, and backward curled 
apices, the latter overhanging a large and deeply impressed heart-shaped 
lunule, which is higher than wide, and is hounded by a moderate slope, t lit 
margins of the valves immediately below the lunule forming no such keel as 
is seen in Cyprina roemeri, the anterior termination of the shell being, on tbg 
contrary, very obtuse; posterior slope in either valve bicarinate, having, in 
addition to the primary angulation which abruptly separates the discal from the 
posterior slope, a second and similar radial angulation at a position which is at 
