434 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [May 6, 



15. Asthma endothecata, spec. nov. PI. XY. figs. 7 a, 7 b. 



An Astrsean, characterized by large corallites, great development 

 of the costa? and exotheca, as well as of the endotheca, and by the 

 delicate and numerous septa. Varieties are found in the Lower 

 Calcareous beds (Marl) of Antigua very closely allied to this form. 



Corallum tall, subplane above. Corallites tall, stout, cylindrical ; 

 a little wavy in their course, slightly enlarged here and there ; close, 

 but not crowded, separated occasionally by buds, which speedily be- 

 come as large as the parent corallite. Wall well developed, strong. 

 Calices rather irregular in size, irregular in their mutual distances, 

 and unequally elevated above the surface ; not much elevated, 

 but still decidedly so, like truncated cones ; margin thin ; external 

 surface of the calices inclined, and marked by the costa? and oblique 

 dissepiments. These dissepiments have often a granular tooth, and, 

 when broken through, a corresponding dissepiment with a tooth 

 is seen below. Septa delicate, barely exsert, straight, granular; 

 in six systems of four cycles, the higher orders being but slightly 

 developed. Costa? largely developed, those belonging to the fourth 

 and fifth orders of septa being smaller, and hidden between the 

 large costse on each side ; they have, moreover, a papillary-looking 

 tooth between each dissepiment. On the calicular surface the costa? 

 are small and slightly dentate. Columella well developed, formed 

 of lax trabecule. Endotheca greatly developed, close, vesicular, 

 and separating the interseptal loculi into cells ; it closes the shallow 

 calicular fossa, leaving a few foramina. Exotheca greatly developed ; 

 dissepiments stout, inclined forwards and downwards, arched; on 

 each dissepiment is the tooth of the fourth cycle. Wo epitheca. 

 Increase by extracalicular gemmation. Diameter of the calices -| inch, 

 of the corallites a little more. Exothecal cells three in ^L- inch. 



This fine Astraean is not to be identified with any known species ; 

 its endothecal development is extraordinary, and connects it with 

 the Astrseans from Antigua possessing much endotheca. It is worthy 

 of notice that the European Miocene Astrseans are generally charac- 

 terized by having much vesicular endotheca. 



From the Mvaje shale of Ban Domingo ; varieties in Antigua and 

 Persia. 



16. Astrjea cyllndeica, spec. nov. PI. XY. fig. 8. 



Corallum flat ; surface irregular, nearly plane in large specimens ; 

 marked by prominent truncated cones (ends of corallites), with 

 very projecting and somewhat irregular costse. Corallites wide 

 apart, short, from 1-J- to 2| inches long, cylindrical, more or less 

 parallel, becoming sensibly smaller close to the calice, projecting 

 considerably (from 3 to \ inch) above the common ccenenchyma; 

 often twisted inferiorly, and swollen out [in certain parts. "Walls 

 very well developed, stouter below than above. Costa? forming a 

 marked structure ; very slightly developed at the immediate calicular 

 margin, they are soon considerably and often irregularly produced in 

 some corallites, while in others they form thin, well -developed, sub- 



