93 



6. Ceratotrochus ( ConotrochusJ funicolumna n. sp. 



The dead corallum, which is all that we possess of this singularly 

 elegant species, looks much like a shortened form a of Conotrochus 

 typus Seg. from the Sicilian Tertiaries, to which it is evidently 

 nearly related, as also to Pleurocyathus brunneus Moseley. 



Corallum attached, conical, short, the calicular orifice perfectly 

 circular. The costse, which correspond in number to the septa, 

 are all of one size and form, but are somewhat hidden by a thin 

 epitheca in which broad rings of accretion are noticeable. 



The rounded summits of the septa are just visible above the 

 sharply defined calicular margin. The septa are in six systems 

 and four complete cycles, the primaries being the largest and the 

 others gradually dimiuishing in size in serial succession ; they all 

 descend very deeply into the cup. 



The columella is a stout isolated column of reinarkable height, 

 composed of over a dozen long ribbon-like strands, which are 

 all tightly twisted together in one spiral like a piece of rope. 

 Height of corallum 12.5 millim. 

 Diameter of calicle 11.5 » 



The rope-like columella of this species is very characteristic. 



7. Cyathoceras Tydemani n. sp. 



Corallum elongate-goblet-shaped, attached by a short, curved, 

 cylindrical pedicle. Thecal wall thin, granular. The costse are 

 granular ridges only reaching halfway down the thecal wall ; 

 those of the first two cycles are the most distinct, and even they 

 are not very prominent. 



Calicular orifice nearly horizontal ; calicular fossa very deep. 



The septa, which are only very sltghtly exsert, have a distinctly- 

 granular surface and a sinuous edge. They are 60 in number and 

 their arrangement is decidedly irregular, appearing to be in six 

 systems of four cycles with two extra half-systems intercalated. 

 Those of the first two cycles are much the largest and the most 



