FROM THE OOLITIC STRATA. 3 



Mr. Leckenby discovered the interesting specimens upon wliich I have founded the 

 genus Gonioseris, one of the most extraordinary fornis of the Fwnpdce as yet described. 



There are several new species of the genus Thamnastrcea. Thamnastreea JBrowni, nobis, 

 is remarkable for having in some specimens a long stalk surmounted by a knob-shaped head. 

 The calices are small on the stalk, and very large on the head ; so that when the form is 

 examined before it is mature, thei'e is a danger of producing two species instead of one. 

 The stalk often attains the height of three or four inches. In other specimens there is no 

 stalk, and the knob-shaped corallum is sessile. 



A large specimen of Thamnasfrwa Manseli, nobis, Inferior Oolite, is pedunculate, short, 

 and very expanded superiorly; the epitheca is well preserved, and the endothecal dissepiments 

 can be seen. This is a very satisfactory species, and I have had it very carefully drawn, 

 so that the suspiciously synapticular endotheca can be proved to be really dissepimental. 



A specimen of Cladophyllia Baheana is remarkable from the disposition of the 

 Corallites to combine and form serial and fissiparous calices as in Thecosmilia. 

 Plate HI, figs 1—4. 



I am under great obligations to Dr. Holl, F.G.S., Mr. Manseli, F.G.S., Mr. R. Tate, 

 F.G.S., Dr. Wright, F.G.S., Mr. T. C. Brown, Mr. Leckenby, P.G.S., and many other 

 geologists, for the kind loan of specimens. 



