Cretaceous Sj)ecies o/Podoseris, Dune. 25 



List of Cretaceous Pocloserida3. 



1. Podosei-is elongata, Dune. {op. cit. p. 25). 



2. mamilliformisj Dune. {op. cit. p. 25). 



3. affiyiis, sp. no v. 



4. anomala, sp. nov. 



5. Jessoni, sp. nov. 



6. brevis, sp. nov. 



7. dubi'a, sp. nov. 



Reconsideration of the old and Description of the tiew Species. 



Podoseris eJongata, Dune, was described in the Monogr. 

 Brit. Foss. Corals, 2nd ser., Pal. Soc. 1869, Cret. Corals, pt. ii. 

 no. 1, p. 26, pi. ix., and now requires some reconsideration on 

 account of the discovery of some very interesting varieties. 

 In one form, lately examined, the attached base is not so wide 

 as the calice, whilst in the type the reverse occurred. This 

 variation in the relative breadth of the calices is due to the 

 coral having died at a particular stage of growth, and it can 

 readily be imagined, after examining a tall corallum which 

 has constrictions and enlargements of its otherwise cylindrical 

 body, that calicular growth must have occurred both when 

 the body was narrow and when it was broad. This variation 

 in the breadth of calices is seen in many of the simple corals 

 of the present day. 



The septa are numerous and the greater number of them 

 are long, stout, close, often uniting with a neighbour far 

 inwards, or the union may not occur in all systems. Many 

 septa, mainly formed by the union of others, reach the axis 

 and join, forming with a very small amount of interseptal 

 tissue a columella, which is usually seen at the bottom of the 

 central fossula or which may project. The costa3 were admi- 

 rably drawn by De Wilde in pi. ix. of the memoir noticed 

 above, and also the remarkable nodules shown on their 

 flanks. These more or less wedge-shaped bodies are nume- 

 rous and are either projected transversely or obliquely towards 

 the neighbouring costa or septum. They rarely unite 

 with these as stout synapticulaj directly, but interdigitate or 

 are united by thin dissepimental ends, either with the corre- 

 sponding bodies or with the opposed costa or septum. The 

 synapticulffi are both stout and thin between the septa, but 

 large ones are not common. The epitheca is sometimes pre- 

 served and is incomplete and in bands ; it allows the alter- 

 nately large and small costal, the intercostal spaces, and even 

 the synapticuke to be recognized, and may be granular. 



