PLATE 45. 45*. 
INSECTS. LIMESTONE. 
P. 45 — FIG. 1, 2. p. 45* — FIG. 1, 2, 3. 
ENTOMOLITHUS Onicites (Derbyensis) oblongo- 
ovatus marginatus : margine integerrimo, dorso cari- 
nato; segmentis trlarcuatis tuberculatis, capite gib- 
boso: tuberculis duobus (oculis?) lunatis, cauda 
Integra. S. p. 
A petrified Insect. The original an Oniscus. The body 
oblong-ovate, broad and rounded at the head, smaller and 
more pointed at the tail; — convex, marginated; the mar- 
gin entire, or not divided by the segments of the back. 
Head or thorax* large, gibbous, equal in breadth to the 
abdomen; semicircular in front, with a broad, distinct, 
striated margin, joining that of the body; behind straight, 
separated from the back by a transverse line. The surface 
of the head longitudinally divided into three distinct parts : 
the middle one of these gibbous, rounded, and, when 
examined under a glass, apparently somewhat rough or 
scabrous. Between this part and the back, a small oblong 
protuberance, constantly surmounted by a single minute 
point or tubercle, which, however, is not visible without 
the assistance of a magnifier. The lateral portions of the 
X 
* In the genus Oniscus the head and thorax are united. 
