218 DE. G. J. HINDE ON RADIOLAEIA IN CHEET [May 1899^ 



Detjppalonche ovata, sp. nov. (PI. XYI, fig. 15.) 



Test evenly oval, the medullary shell about one-fourth the diameter 

 of the cortical, the pores minute and apparently similar in both 

 outer and inner shells ; the spines are somewhat slender, tapering, 

 and at unequal distances apart. Cortical shell, 0"13 by 0*1 mm. in 

 length and breadth ; medullary, 0-035 by 0*03 mm. ; longest spine, 

 0*1 mm., and thickness at base, 0*015 mm. ; pores, 0*005 mm. in 

 width. Eare. 



Order DISCOIDEA, Haeckel. 

 Genus Teochodisctjs, Haeckel. 



The test is a simple, lenticular, latticed shell, with a variable 

 number (ten to twenty or more) of radial spines extending from the 

 equatorial margin. 



Teochobiscits (?) DUBius, sp. nov. (PL XYI, figs. 4 & 5.) 



Test small, round or oval in outline ; pores few, circular or oval, 

 very unequal in size, the smaller interspersed among the larger. 

 There are four or five stout conical radial spines, at unequal distances 

 apart, and apparently not all in the same plane. Diameter of test, 

 0-07 mm. ; pores, 0*005 to 0*02 mm. in width ; length of spines, 

 0*05 mm. Eadial rods are present in the interior of the disc. In 

 the irregular character of the pores this species resembles Trocho- 

 discus proavus, Rlist, from the Carboniferous rocks,^ referred to by 

 Riist as representing the simplest form of the genus. The spines in 

 the form here described are fewer in number than in the type of 

 the genus, and it is doubtful whether it can properly be included 

 therein. 



The following is a list of the forms described in the foregoing 

 pages : — 



SPHiEROIDEA. 



8ti(/mosphcsra echinata, sp. nov. 

 Carposphcsra nana, sp. nov. 

 8tigmos'iph(srostylu8 inaqitalis, sp. nov. 

 Prunoidea. 



Cenellipsis setosa, sp. nov. 



C.favosay sp. nov. 



C. scitula, sp. nov. 



Staurodruppa micula, Hinde. 



St. Foxii, sp. nov. 



Dncppalo7iche clavigera, gen. et sp. nov. 



Dr. ovata, sp. nov. 



BiSCOIDBA. 



Trochodiscus (?) diihius, sp. nov. 



Though all the foregoing forms are here regarded as new, two of 

 the eleven species, Carposplicera nana and Cenellipsis favosa, were 

 recognized in the Mullion Island chert, but not named. 



The genus Cenellipsis is the most numerously represented in 

 the Chypons chert, just as in that of MuUion Island. Next to 

 Oenellijysis, forms of Staurodruppa are the most abundant. This 



^ ' Palseontographica,' vol. xxxviii (1892) p. 164 & pi. xxi, fig. 1. 



