36 DE. J. W. GKEG0RY ON THE GEOLOGY AND [Feb. 1 9OO., 



Metethmos asymmetrica, sp. nov. (PI. IT, figs. 11 a & 11 h.) 



Diagnosis. — Corallum large and cornutiform. The base is 

 pointed, and the upper surface flat; the transverse section is elliptical. 

 Columella about one-tenth the diameter of the corallum. Ex- 

 centric in position, being nearer the convex side. 



Septa large and crowded, and unsymmetrically developed on the 

 two sides of the columella. The septa are longer and more numerous 

 on the concave side of the corallum, where they occur in six in- 

 complete cycles. On the opposite side there are only four cycles. 



The primary and secondary septa are thick, and appear imper- 

 forate ; in the section on the concave side of the corallum the 

 tertiary septa may be the same, but on the other side the tertiary 

 septa and those of higher orders are thin and perforate. 



Dimensions. — Height of corallum = 60 mm.; diameter, major 

 = 40 mm., and minor = 29 mm. ; diameter of columella = 4 by 3 mm. 

 Distribution. — Dobar Limestone: Dobar." Coll. Mrs. Lort 

 Phillips. 



Affinities. — Externally this coral strikingly resembles Mont- 

 livaltia cormitiformis, Greg. 1 but may be distinguished from it in 

 transverse sections. It is much larger than the two Indian Jurassic 

 species of Metet7imos, and the septa are more numerous. 



Asymmetry in the septal sequence on either side of the axis of 

 the corallum is not unusual in corals with a curved axis, and is 

 well illustrated in this species. The septal sequence in two opposite 

 sectors is as follows : — 



1 10 6 4 8 11 3 9 5 7 2 7 5 9 3 8 4 6 1 

 1 4 3 5 2 5 3 4 1 



Genus CrcxoLiTES, Lamarck, 1801. 



1. Cyclolites heliophana, de Rochebrune. 



1882. Ci/clolites heliophana, A. T. de Rochebrune, ' Obs. geol. & pal. Region 

 Qomalis ' Mission Revoil, Faune & Flore des Pays Comalis, pt. vii, p. 38 & pi. iv, 

 fig. 1. 



Diagnosis. — Corallum orbiculate, subconvex above, concave 

 below. Calicular fossa round. Septa equal, very thin and straight ; 

 laterally covered with alternately-arranged conical granules. 



Dimensions. — Diameter = 43 mm.; height=19 mm. 



Distribution. — Neocomian (?) ; Amura, Singeli District. 



2. Cyclolites Phillipsijs, sp. nov. 



Diagnosis. — Corallum large, elliptical, and thick. The base 

 is uneven. The columellar fossa is short. 



Septa very numerous, amounting to about seven cycles. The 

 primary septa measure as much as 3 mm. in thickness. The septa 

 occur as isolated trabecule in only the highest orders ; iu the 

 lower orders the trabecule are united by stereoplasm. 



1 ' Jiu\ Fauna Cutch ' Pal. Ind. ser. 9, vol. li, pt, ii (1899) p. 85 & pi. iv, fig. 7. 



