FOUNDING OF NEW SPECIKS. 275 



Chonophylhom pseudohelianthoides, n. sp. 

 (Plate 8, figure 6.) 



Simple, short conical in growth, with a central pit in the calyx, 1:5 cm 

 in diameter and 5 mm in depth. The side walls of this pit curve up- 

 ward and outward, and the outer margins are regularly reflexed as in 

 Cyathophyllum helianthoides, Goldf. The bottom of the calyx is flat for a 

 distance of 7 or 8 mm and shows no fovea. The length of the specimen 

 was about 2.5 cm, and the expanded calicinal margins reached a breadth 

 of 5 cm. Only traces of the outer epithecal covering remain. There are 

 72 alternating septa, the secondaries terminating at the outer edge of the 

 pit, while the primaries reach the center without any twisting. They arc 

 thin in the vicinity of the pit, but gradually widen into low granulose, 

 convex hands, 1.5 to 2 mm in breadth, leaving very narrow grooves in 

 the outer reflexed portion of the calyx. These septa are formed by 

 radial curved plates superposed as in other species of the genus, but less 

 regular in form and position. They average about 30 to the cm. Radial 

 sections through the septa give a vesicular structure instead of the parallel 

 edges seen in (1 magnificum and 0. ponderosum. The septal layers are 

 here shown to be quite irregular and anastomosing so as to form elongated, 

 narrow vesicles. The interseptal cavities are not so well defined as in 

 typical forms of the genus, the septal layers passing into them, abutting 

 against one another, and in places interweaving. The vesicles are rela- 

 tively coarse and irregular toward the center, passing into the typical 

 transverse leaflets and not forming tabula?. 



Formation and locality: Upper Silurian, Conjepruss, Bohemia. 



This species is distinguished from previously described forms by its 

 very regular, reflexed growth and the irregularities in its septal structure. 



Qhonophyllum greenei, n. sp. 



(Plate 8, figure 7.) 



Simple, of conico-cylindrical growth, having an original length of 

 aboul 5.5 cm and a calyx diameter of 3 cm. The base has been lost. 

 and but a faint indication remains of the outer covering. The succes- 

 sive calyces in the lower half of the corallum are oblique to the axis, as 

 though it had been compelled to grow away from an obstruction. The 

 calyx has a centra] pit, 1.5 cm in diameter and 1 cm deep, with a 

 roughened horizontal bottom, slightly depressed around the outer edge, 

 hut showing no fovea. The side walls of the pit are nearly vertical, and 

 at the tup roundoff into a horizontal ring-like expansion aboul 1 cm 

 broad. The septa, number ~'l and are of two orders, the secondaries 

 terminating at the outer wall of the pit. while the primaries reach the 



