^0^ Dr. P. M. Duncan on some Fossil Corals from Sinde, 



and flat. The monticules are very small, and are much less 

 than the corallites ; they resemble small insects^ are compressed 

 laterally, very slightly elevated, and are wide apart. The septa 

 are numerous, and the longest arise from the middle of the; 

 monticule; they are alternately very short and long, and are 

 often enlarged at the free extremity, but otherwise are straight 

 and thin. Height of corallum 3^ inches. Length of monticules 

 iV inch, breadth -^ inch ; width of series -ro — i^ mch.. 



Locality, Sinde Tertiaries. Coll. Geol. Soc. 



The minute monticules, their compressed form, and septal 

 arrangement distinguish this species. 



15. Hydnophora plana, n. sp. PI. XIX. fig. 3. 



Corallum foliaceous ; its upper surface level, and marked by 

 numerous conical monticules rather inclined and often in parallel 

 series, whilst the lower is indistinctly marked by faint costse* 

 The monticules are irregular in size, rarely thin above, often 

 compressed in the direction of the series, and varying in height* 

 The septa are distinct, and a large one is usually succeeded by 

 a smaller. Width of the valleys \ inch, depth ^ inch ; ten 

 large and ten small septa in \ inch. 



Locality, Sinde Tertiaries. Coll. Geol. Soc. 



This species is allied to two recent species, but has only a 

 generic affinity with the Eocene Hydnophora Bronni and with 

 the next form described. The alliance with H. Demidoffi and 

 H. exesa is close : they are both from the Indian Ocean. 



16. Hydnophora hemispharica, n. sp. PI. XIX. fig. 4. 



Corallum irregularly hemispherical, concave below, and very 

 convex above. Monticules very irregular in size and shape : the 

 majority very small, and conical ; the rest either larger and conical, 

 or large and very long in the direction of the series, and all ap- 

 pearing to have been sharp at the summit, and rarely compressed. 

 The septa are numerous, delicate, alternately large and small, 

 and crowded. Width of valleys i^-- 1\ inch. Height of monti- 

 cules ^ inch. Height of corallum, IW inch. 



Locality, Sinde Tertiaries. Coll. Geol. Soc. 



This species belongs to the same section as the Eocene H. 

 Bronni, but is readily distinguished from it : however, this is 

 the closest alliance it has. 



17. SolenastrcBa, sp. 

 A rolled specimen of a new species of this genus in the British 

 Museum is too much worn for a correct diagnosis to be made. It 

 is easily distinguishable from S. Verhelsti. Locality, Sinde 

 Tertiaries, 



