42 PALAEONTOLOGY Iffr NEW-YORK. 
terior side, the dissepiment abruptly and deeply bent downwards, and a single ray at this point 
is obsolete. 
This species has the ordinary external appearance of Streptelasma, for which it may be 
mistaken from its external characters, the cup being usually filled with stony matter. In per¬ 
fect specimens the lamellae are scarcely distinct bn the outside, but most of the specimens seen 
are worn or dissolved so much as to show them very conspicuously. Within the cup the rays 
are usually curved, and often uniting two or more in one before reaching the centre. The 
dissepiments bend abruptly downwards near the margin, presenting a deep cavity between the 
rays. On the anterior side the dissepiment is bent downwards more deeply-, and one ray is 
carried with it or partially obliterated. This peculiar feature is very conspicuous and charac¬ 
teristic. From each side of this depression the lamellm are often almost continuous to the 
posterior side ; and all the other lamellae from each side join these, leaving a narrow groove 
or space through the centre of the cup. 
This species possesses the peculiar characters of Caninia, as represented in some of the 
figures of Michelin and de Koninck, though other species united under the genus have a 
different structure in addition to this curvature in the dissepiments. 
Fig. 3 a. Posterior view, showing the shorter posterior side and oblique cup, which has about 
48 rays. 
Fig. 3 b. Anterior side of another specimen, showing the mode of increase by the addition of 
new rays or lamellae. 
Fig. 3 c. An enlarged view of the cup of another specimen. 
Fig. 3 d. A longitudinal section, showing the internal characters. 
Fig. 3 e. A young specimen, lateral view. 
Fig. 3 f. Enlarged view of the cup, showing the irregular union of the lamellae in the centre. 
Fig. 3 g. A large individual : view a little on one side of the anterior face. Rays 50 or more. 
Fig. 3 k. An irregular form, apparently of this species. 
Position and locality. This species is most abundant at Reynale’s basin, and occurs also at 
Lockport, Niagara county. It is also found at Rochester, associated with Pentamerus oblongus , 
and at the iron ore beds in Wayne county. (State Collection.) 
420. 1. CYCLOLITES ROTULOIDES (n. sp.). 
Pl. XVII. Figs. 4 a, 6, c, d, e. 
Compare Madrepora radiis dentatis, Fougt. 1745 ; Linne, Amoen. Acad. t. i, p. 194, f. 5, 1749. 
Madrepora porpita. Linne : Gmelin, pag. 3756, no. 3. Guettard, Mm. iii, tab. 23, 
figs. 4 & 5. 
Fungia nummismalis. Goldfuss, Petrefacta Germania, pag. 48, pl. 14, fig. 4 a, b. 
Cyclolites numismalis & C. orbiculata. Lamarck, System, t. ii, p. 233. 
Cyclolites numismalis. Blainville, Actinologie, pag. 335, pl. 51, figs. 1, 1 a & 1 5. 
Cyclolites nummismalis, Hisinger, Lethaea Suecica, pag. 100, pl. 28, fig. 5 a, b, c. 
Coral circular, the upper surface convex with a circularly depressed centre, marked by about 
20 original rays which proceed from the centre, and an equal number of smaller secondary or 
