156 REPORT — 1869. 



logy of the Cretaceous rocks. The species are distributed as follows in 

 Great Britain : — 



8railotrochus tuberosus, Ed. ^~ H. 1 



elongatus, Duncnn. I Upper Greensand. 



angulatus, Duncan. J 



elongatus, Duncan. "j 



granulatus, Duncan. ^ ,. 



■ ■ • n r Gault. 

 insignia, Uuncan. \ 



cylindricus, Duncan. j 



Austeni, Ed. <|- H. Lower Greensand. 



Smilotrochus elongatus, Duncan, is found in the Gault and Upper Green- 

 sand. 



Smilotrochus Hagenoiui, Ed. & H., is a fossil from the Macstricht Chalk 

 (Ed. & H. Hist. ]N"at. des Corall. vol. ii. p. 71). 



Subfamily CAETOPHTLLHf^. 

 Division Caetophtlliace^. 

 Genus BRAcnrcTATHirs. 

 BracJij/cijaf7iHs Orhignijanus, Ed. & H. 



The corallum is very short. The costse are indistinct. The septa are 

 long, very slightly exscrt, granulated from below upwards, and there are 

 four cycles in six systems. The primary aud secondary septa are equal; 

 the tertiary are a little longer than those of the fourth cycle ; all arc 

 tliin and straight. The paU are like continuations of the tertiary septa 

 before which they are placed ; they are granular. 



Height ^ inch. Breadth J^ inch. 



Locality. East Shalford, Surrey, base of -the Lower Greensand. Found 

 Avith Ccrithium Neocoiuicnse, D'Orbig. ; Exogi/ra suhjyJicata, Tqm. ; Area 

 liaulina, Leym. ; Terehratula sella, Sow. 



In the collection of C. J. Meyer, Esq., E.G.S. 



The specimen upon which the genus was founded was found in the Neo- 

 tomian formation of the Hautes Alpcs, at St. Julien, Beauchene. I have 

 added to the original description, as some portions of the English specimen 

 are better preserved than the type. 



Family ASTE^ID.?^. 



Subfamily Eusmilinje. 



Division TROCHOSJIlLIACEiE. 



Genus Tuochositilia. 

 Trochosjnilia Meyeri, Duncan. 



The corallum is small, cylindrical or cylindro-conical ; its base may be 

 •wide or very small, and was adherent. The epitheca is complete. The 

 coslse are very small, and are occasionally seen whei'e the epitheca is worn. 

 The calice is rather deep. The septa are crowded, unequal, spincd near the 

 axis, and form six systems. There are four cycles of septa. The calice is 

 usually circular in outline, but it is occasionally compressed. The axial 

 space is small. The endotheca is very scanty. 



Height ylj inch. Greatest breadth -j2_ inch. 



Varietij. The corallum is short, broad, cylindrical, slightly constricted 

 centrally, and has a broad base. 



Height T5^ inch. Breadth 7— ^ inch. 



