Zoorpuyva. | UPPER PALAZOZOIC RADIATA. 85 
CLADOCHONUS BREVICOLLIS (J/°Coy). PI. 3. B. fig. 10. 
Ref.—MCoy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 128. 
Sp. Ch.—Slender stem-like neck of each cell about one line long and half a line in diameter, the upper end 
suddenly swelling to a cup-shaped cell about two lines long and one line in diameter, curving downwards at an 
angle of about 135°, the point of junction of the cup and the stem giving origin, at an angle of 45°, to the stem 
of a second cell similar to the first, but inclining in the opposite direction, and, in like manner, giving origin from 
its upper convexity to a third, and that to a fourth, &c. perfectly similar cell, forming together an erect, regularly 
zigzag corallum. 
From its regularly angular mode of growth or connexion of the large drooping bell-shaped cups, inclining in 
opposite directions from thin short slender stems, this is one of the prettiest species of the genus. It most 
resembles the C. tenuicollis (M*Coy), figured in the “ Annals” for October, 1847 (PI. 11, fig. 8), from the 
carboniferous shales of New South Wales, but is distinguished by its smaller size and much shorter necks 
to the cells, while, as in that species, their small diameters compared with their cups distinguish it from the 
C. crassus (M°Coy) of the carboniferous slate of Ireland. 
Position and Locality.—Rare in the carboniferous limestone of Derbyshire. 
Explanation of Figure.—P1. 3. B. fig. 10. Natural size, from Derbyshire. 
CLADOCHONUS CRASSUS (J/°Coy). 
Syn. and Ref.—Jania crassa (M°Coy), Syn. Carb. Foss. Irel. t. 27. f. 4. 
Sp. Ch.—Irregularly di- or tri-chotomous ; branches thick, conical,short, two to four lines long, nearly one 
and half lines thick at their origin, expanding gradually to form a very short conical cup, about one and 
two-thirds of a line in diameter, slightly inclined obliquely to one side, and giving off one, or sometimes three 
similar branches and terminal cells from the opposite side. 
This is the largest species of this group I have seen; it most nearly resembles the C. bacillarius (M°Coy), 
from which it differs in the great thickness and conical form of the branches. The mode of attachment of the 
young is most usually by the early branches growing in a circle round a crinoidal stem. Length of specimens in 
the shales is usually from one to two inches ; length of branches about three lines, diameter of branches at base 
usually about one line, at extremity one line and half. 
Position and Locality—Abundant in some parts of the limestone of Derbyshire. The original Irish 
locality was the carboniferous slate of Lisnapaste, Ballintra. 
Family. CYATHOPHYLLID. See page 27. 
Subfamily. CYATHOPHYLLINZE. See page 27. 
Genus. CYATHOPHYLLUM. See page 69. 
CYATHOPHYLLUM DIANTHOIDES (J/’Coy). Pl. 3. C. fig. 7. 
Ref —MCoy, Ann. Nat. Hist. 2nd Series, Vol. III. p. 7. 
Sp. Ch.—Corallum very proliferous, forming wide conical groups ; individual cones rapidly expanding ; 
averaging one third (or less) longer than wide, concentrically wrinkled, and with obsolete longitudinal strize 
externally ; terminal cup very deep, with either a sharp or truncated edge, and containing from ninety-six to a 
hundred (as it approaches one inch in diameter) very thin, apparently crenulated, radiating lamellz, alternately 
longer and shorter; vertical section shews less than one third the diameter on each side occupied by minute 
vesicular tissue, the rows of rounded cells extending obliquely upwards and outwards, about ten in each row, but 
