OPHIOLEPIS. 
161 
to their terminal end. They were stoutly built of rings of imbricated scales, which are 
neatly arranged so as to form a chain-like structure (fig. 3 a), each upper segment 
being made up of two halves united along the middle line, as shown in fig. 3 h. The 
under segment is formed likewise of two pear-shaped, obliquely-twisted scales, which at 
their junction in the mesial line have a small supplementary scale inserted between the 
round terminations of the lateral pieces. The rays appear to have been much flexed, as 
all the arms are bent (fig. 3 a) in different directions in the smaller specimen on a slab 
of Grey Limestone now before me. 
Affinities and Differences. — Ophiolepis Lechenhyi, Wr., differs much from Ophiolepis 
Murravii, Wr. The disk is smaller, and the arms longer and more slender, and thus 
this species is easily distinguished from the Lias forms. 
Locality and Stratigrap Ideal Position. — The two specimens of this Brittle-star were 
collected from the Grey Limestone near Scarborough, which represents the middle zone 
{Stephanoceras Hmnphriesianwii) of the Inferior Oolite. These little radiates appear to 
be rare, as I have seen no other examples of them in any other local collection. 
B. Species from the Upper Triassic. 
Ophiolepis Damesii. WriyJit, n. sp. PI. XXI, figs. 4 and 5. 
Ophiolepis Damesii, Wright. Zeitschrift der Deutschen geologischen Gesellschaft, 
pi. xxix, figs. 5 a, b, p. 821, Jahrgang 1874. 
Body-disk small, upper surface convex and undulated, rays long, cylindrical, 
four times the length of the diameter of the disk ; dorsal shields of rays smooth, 
semicircular ; ventral shields form a double chain of round prominent joints, which 
extend from the mouth-opening to the end of the rays. 
Dimensions. — Diameter of the disk one quarter of an inch. Length of the rays one 
inch. 
Description. — This beautiful little Brittle-Star belongs to the genus OpJiiolepis. The 
upper surface of the discal body is convex and undulated, being elevated at the points in 
the circumference where the rays proceed outwards, and depressed and concave between 
the inter-radial elevations. The round slender rays end in very fine points. The upper 
surface of the discal body is covered with small delicate scales. The rays have semi- 
circular shields on their upper surface, and on the under side a double row of articulated 
segments, which extend from the mouth to the end of the rays. 
This Ophiolepis resembles Ophiolepis Murravii, Porbes, from the Marlstone of York- 
