50 BRITISH FOSSIL CORALS. 



3. Parasmilia Cylindrica. Tab. VIII, fig. 5. 



It is not without some hesitation that we inscribe this species in the list of our 

 Parasmilia, for the specimen about to be described is extremely incomplete ; but it does 

 not present the specific characters of any other species, and although very nearly allied to 

 P. elongata and P. Mantetti, it appears to differ from both in some essential points. The 

 fragment here alluded to is deficient both in the basis and in the calice, but it appertained 

 to a tall, nearly cylindrical corallum, that was somewhat bent. The costce are almost equal, 

 extremely thin, sublamellar, but not very prominent,, subflexuous, very slightly granulated, 

 and divided at short intervals by circles of small dissepiments, formed by rudiments of an 

 exotheca. The intercostal furrows are broad, rather shallow, almost destitute of granula- 

 tions, and presenting sometimes in the middle a small rudimentary costa. Columella well 

 developed. Septa forming four complete cycla, not very closely set, somewhat flexuous, 

 and slightly granulate ; those of the first and second cycla equally developed, and rather 

 thick ; the tertiary ones smaller and thinner ; those of the fourth cyclum very small, although 

 the costse corresponding to them are as large as those of the other cycla. Length, above 

 two inches ; diameter, about six lines. 



This fossil much resembles the Parasmilia elongata found at Ciply, but differs from it 

 by the unequal development of the septa belonging to the first two and to the last two 

 cycla, a mode of structure which does not exist in P. elongata. It differs from P. centralis, 

 P. Fittoni, and P. serpentina, by the delicacy and almost lamellar form • of the costse, and 

 bears greater resemblance to P. Mantetti and P. Gravesiana, from which it may, however, 

 be easily distinguished by the breadth of its intercostal furrows. 



The specimen here described belongs to the Palseontological collection of Mr. J. S. 

 Bowerbank, and was found in the upper chalk at Norwich. Another fossil, which we 

 consider as belonging to the same species, exists in the Poppelsdorf Museum at Bonn, and 

 was found in the upper chalk at Darup, in Westphalia. 



4. Parasmilia Fittoni. Tab. IX, fig. 2, 2 a, 2 b. 



Corallum stout, adherent by a somewhat broad basis, immediately above which it in 

 general becomes very narrow ; elongate, much bent, and presenting at intervals circular 

 constrictions. Costa broad, closely set, not very prominent, excepting near the basis, down 

 to which they are quite distinct, rather unequal alternately, and covered with very numerous 

 and small granulations. Calice circular ; fossula large and rather shallow. Columella well 

 developed, but very slightly prominent, of a spongy structure, and terminated by a broad 

 subpapillose surface. Septa forming -four complete cycla, rather thin, straight, not very 

 closely set, slightly exsert, and having but few granulations on their lateral surfaces. 



