24(5 Mlt. J. S. 13ALY ON NEW SPECIES 



nally have been of a corneal iigure, thrice, or thereabouts, longer than 

 that here shown. The skeleton is completely silicified, and what ap- 

 pears to answer to cavities are infiltrated with silica. Eoth upper and 

 lower surfaces are of a roughened nodular character, though the view 

 here given represents the lower border as plane. Both margins for a 

 short distance inwards are markedly in thin undulating layers; deeper 

 and centrally the layers assume minor ovoid figures, and in many, if 

 not all, are radiating lines or pillars therefrom. These ovoid centres 

 appear to correspond to the exterior nodular elevations (see fig. 10). 



Fig. 10. A limited part of the surface of the preceding Stromatoporoid (fig. 9), 

 of nat. size, showing the nodose elevations, and that besides these 

 granular, they bear evidence of stellar tracery in agreement with the 

 oval interior designs. 



Fig. 11. A vertical transparent section of a portion of fig. 9 under an inch ob- 

 jective (=x60 diam.). It is difficult to interpret the microscopic 

 appearances here presented other than by supposing the larger dark 

 areas as openings or expansions of an intricate system of tubulation. 

 In other portions of the slide, but not here shown, there were indica- 

 tions of a network comparable with that of some of the Lithistid 

 sponges. 



Fig. 12. The exterior surface of one of the layers of a fragment of the fossil 

 Polyzoon Eschara nobilis, Michelin, X2 diam. 



Fig. 13. A vertical section through a series of the layers of the same specimen 

 of E. nobilis, also X 2 diam. These figures are introduced for com- 

 parison with the structure of Stromatopora, &c. ; the vertical section 

 displays a great general resemblance to similar sections of Btromato- 

 ■pora, inasmuch as horizontal layers and vertical pillars are present. 



Description of New Species and Genera of Eumolpidce. 

 Bj Joseph S. Balt, Esq., M.E.C.S., F.L.S. 

 [Read December 20, 1877.] 



List of Genera, Species, and their Habitat. 



Aoria Mouhoti Cambodia. 



EuhracMs (n. g.) spinipes .... Cameroous. ' 



„ indica Northern India. 



Leprotes fulva Tartary. 



„ Lewisi China, Japan. 



Salodonta Siinoni Australia. 



Paraseela (n. g.). 



Cheiridea (n. g.) Chapuisi .... Sierra Leone. 



Golasposoma sellatum "Western Australia. 



Oonus pallidas ,, „ 



