NATURAL SCIENCES OP PHILADELPHIA. 519 



Description of a new species of Cassidulus, from the Cretaceous formation 



of Alabama. 



BY AV. M. GABB. 



C. micrococcus. PL 8, fig. 1. Oval, slightly flattened, widest just 

 behind the mouth ; ambulaeral summit in advance of the centre : below 

 slightly concave ; peristome small, the channels between the tubercles very 

 narrow ; surface above minutely an I sparsely granulate ; below covered 

 with small, closely arranged tubercles, placed irregularly. 



Ripley Group, Eufala, Ala. 



This species resembles C. cequorus of Morton, but is twice or three times as 

 large ; the upper surface, which is distinctly granulate in Morton's species, is 

 apparently smooth, except under a glass, in this. Below, the tubercles on 

 this species are very small, closely and irregularly arranged. In aquorus 

 they are much larger, and placed further apart. The anal furrow does not 

 approach so near the lower margin as in cequorus. 



Contributions to the Carboniferous Flora of t'ao Unitad States. Vo. II. 

 BY HORATIO C. WOOD, JR. 



Cyclopteris, Brong. 



C. c r is pa, nobis. 



Syn. Filicites crispa, Germ. & Kaulf. Nova Acta Acad. C. L. C. Nat. Cur. 

 vol. xv. par. ii. page 229, pi. 66, fig. 6, 1831. Adiantites Germari, Giipp, Sys. 

 Fill. Foss. Nova Acta, vol. xvii. Sup. p. 218, 1836. Cyclopteris Germari, 

 ''GiJpp," linger, Gen. et Spec. Foss. Plant, p. 96, and Prof, Lesquereux, Geol. 

 of Pennsylvania, vol. ii. p. 856. 



C. Wilsonii, nobis. 



Leaf sub-orbicular or subobovate, narrowed at base, thin, plicate ; margin 

 irregular, incised, fimbriate, especially above ; fimbria stout, unequal, often 

 bifurcate, sometimes branched ; nerves numerous, thin, close, arcuate, flexu-* 

 ous, dichotomous. Rachis unknown. 



The nervation of this species, as well as the peculiar form of the fimbria, 

 separates it from C. Jimbriata, Lesq., C. laciniata, Lesq., and C. crispa, 

 nobis. Among the Neuropteris, it is most nearly allied to N. dentata, of Lesq. 

 and may possibly prove to be the cyclopteroid form of that species. In the 

 only specimen that we have seen, both of the leaves have one margin folded 

 beneath them, and are variously plicated. One leaf, only, has the basal 

 margin of one side distinct ; this part of the border is not fimbriate, but un- 

 dulate, probably, however, there will be found to be a variation in this respect. 

 It affords us much pleasure to dedicate this handsome plant to Dr. T. B. 

 Wilson, who has done so much for the advancement of natural science in 

 America. 



Cabinet of the Academy. 



Lepidodexdron, Sternb. 



L. re o t ang u 1 u m, nobis. 



Leaf scar almost a square ; angles about 90 ; margin moderately broad, 

 generally distinct, often slightly raised ; vascular scar broad, sub-rhomboidal, 

 with a small triangular depression at its apex and its basal angle rounded, 

 but the others acute, situated in and filling up the apex of main scar, 

 marked internally with three (often obsolete) dots, which are disposed in a 

 curve near its basal angle ; appendices distinct, sub-parallel to the margin ; 

 medial line not well marked, but with a number of heavy transverse wrinkles. 



I860.] 



