EcuryoperMata.] UPPER PALEOZOIC RADIATA. 121 
AcTINOcCRINUS (Amphoracrinus ?) OLLA (M°Coy). PI. 3. D. fig. 6. 
Ref —M°Coy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 247. 
Sp. Ch.—Body inversely pyriform, very gibbous; arm-bases small, not very prominent; cup below the 
arms hemispherical, visceral portion above very wide, elevated, cylindrical; all the plates above and below 
flattened ; pelvis small, flattened, hexagonal, supporting on five of its sides five large hexagonal 1st primary 
radial plates, about one-third wider than long, and on the sixth side one pentagonal Ist interradial plate ; the 
five 2nd primary radials are scarcely one-third wider than long, smaller than the first ones, and hexagonal with 
the two upper lateral sides so short as sometimes to make the plates seem quadrangular; 2nd interradials 
hexagonal, longer than the Ist primary radials; pectoral plates rather large, flat, polygonal; 3rd primary 
radials (scapulw) pentagonal (or occasionally with the upper lateral angles truncated so as to be slightly hex- 
agonal or heptagonal), one-third shorter than the Ist primary radials; 3rd interradials (interscapulars) 
heptagonal or octagonal, as long as the 2nd interradials ; the surface of all the plates marked with minute 
vermicular wrinkles. Diameter of cup one inch nine lines. 
The sculpturing resembles that of the A. (Amphoracrinus) amphora, from which the species is distinguished 
by its round inflated pot-like figure, small arm-bases, proportionate length of the primary radials, &e. 
Position and Locality—Very common in the Derbyshire carboniferous limestone in company with the 
Poteriocrinus granulosus. 
Explanation of Figure.—P\. 3. D. fig. 6. Profile of specimen, natural size. 
ACTINOCRINUS POLYDACTYLUS (Mill.) 
Ref. and Syn.—Actinocrinites polydactylus Mill. Crin. Actinocrinus polydactylus Phill. Geol. York. 
Vol. II. t. 4. f. 17. 
Sp. Ch.—Plates nearly as in A. triaconta-dactylus, but the radiation much stronger and more simple, only 
one ridge going from the centre of one to the centre of each surrounding plate; five arms, each having two 
hands, of one lateral simple finger, and the inner portion divided into six. 
This is a smaller species than the A. ¢riaconta-dactylus, but closely resembles it in many of the details ; 
the ridges are much more distinct, however, and it is at once distinguished by the greater number of its fingers ; 
the pectoral plates generally shew the remarkable character of being palmated, and divided into several points 
or branches. 
Position and Locality —Carboniferous limestone, Bolland. 
ACTINOCRINUS TESSELLATUS (Phill/.) 
Ref and Syn.—Actinocrinus tessellatus (Phill.) Geol. York. Vol. IT. t. 4. f. 21. 
Sp. Ch.—Cup, shape and size of the A. triaconta-dactylus ; 1st primary radials large, hexagonal, longer 
than wide; three upper sides nearly equal and shortest; 2nd primary radials hexagonal, all the sides nearly 
equal ; 3rd primary radials (scapula) heptagonal; swzface of the plates nearly smooth, crenulated at the edges 
with short, muscular ridges; visceral portion convex, mowth tubular excentric; visceral plates of moderate size, 
very irregularly polygonal, convex. 
This species is very rare; the peculiar form of the 3rd primary radials or scapulz distinguish it from the 
allied species. Is it not the A. /wvis (Mill.) ? 
Position and Locality.—Carboniferous limestone, Bolland. 
ACTINOCRINUS TRIACONTA-DACTYLUS (JZil/.) 
Ref.—Actinocrinus triaconta-dactylus Mill. Crin. 
Sp. Ch.—Cup obtusely conical; 3rd primary radials (scapulze) hexagonal, supporting five arms, having 
each two hands, provided with three fingers each; arm-bases prominent; visceral portion flattened ; mouth a 
little excentric, tubular, visceral plates very small, forming rugged short points; each side of the plates of the 
R 
