10 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [NoV. 9, 



12. Placocyathits Moorei, spec. nov. PI. II. fig. 1 a-c. 



The coral is short, very much compressed, and narrow ; it has a 

 short and flat pedicel, and sides which rapidly expand laterally. 

 The calice is long, narrow, shallow on an even plane, and its mar- 

 gins are not everted, but are slightly sinuous. The fossula is narrow 

 and deep. The costae are delicate, very distinct when uncovered by 

 epitheca, and are parallel near the caUce ; they then curve either to- 

 wards the lateral costse or to the pedicel. The larger costse are slightly 

 prominent near the calice, where they are not granular ; but as they 

 become covered by epitheca they lose their lamellar character and 

 become a series of granules ; near the pedicel they again become 

 lamellar. The smaller costae are granular near the calice, and are 

 generally recognized as lines of simple granules, lamellar here and 

 there. The external and lateral costse are granular, and generally 

 the larger costae are succeeded by a smaller. The septa are numc'- 

 rous, unequal, delicate, granular, exsert, rounded above, and crenu- 

 late, straight at the inner margin, where they bound the fossula. 

 The pali are large, thin, tall, and rounded, and are attached to the 

 small septa, which are placed between the smallest. The columella 

 is very long, thin, lamellar, and sharp superiorly ; it is ridged late- 

 rally for the attachment of the septa and pah. The epitheca is well 

 developed, peUicular, and reaches high up, to -^^ or -^ inch from 

 the cahcular margin. Height of coral 1 ^^ inch ; length 4^^^ inch ; 

 breadth -J-^ inch. There are 24 septa in i inch. 



Locality : Bowden, Jamaica. 



13. Trochocyathits obestts, Michelin, sp. 



A small specimen of this well-known form is in a collection from 

 a Pteropod-marl on Navy Island, off Port Antonio, sent to England 

 by the late Mr. Barrett. It is identical with the species drawn by 

 Michelin. European locality, Tortona. 



14. Thysanus elegans, spec. nov. PL II. fig. 2 a, 2 h. 



This coral resembles T. excentricus, nobis, in form ; but its costse 

 are equal and more decidedly dentate, the septa are finely toothed 

 inferiorly, and every other one has a blunt, thick, granular, and pro- 

 minent paKform tooth. Locality : Bowden, Jamaica. 



15. Stylophora granitlata, spec. nov. PI. II. fig, 3. 



The corallum is ramose ; the branches arfe nearly cylindrical, 

 often fiattened on one side, and leave the stem at an acute angle. 

 The calices are placed irregularly, and are separated by a coenen- 

 chyma, which is sharply granular, and which has very rarely any 

 grooves or continuous ridges on its surface. The calices are circular, 

 not inclined, very deep, and are surrounded by a raised ring formed 

 by the septa and costse. The columella is situated deeply ; it is cy- 

 lindrical below, and sharp where free, but it does not reach the level of 

 the calicular margin ; it is delicate, and six large septa are attached 

 to it low down. The septa are in two sets. The superficial septa are 



