24- Citharocyathus conicus n. s. Plate III. fig. i8, 18^7. 

 Stat. 95. 5°43'.5 N., ii9°4o'E. 522 m. 2 Ex. 



Corallum free, straight, moderately elongate, very elegantly cylindro-conical, ending in a point. 



CostfE continuous from the pointed base to the circular mouth, broad and close-set but 

 very deep-cut, crisply granular and denticulate, all of one size. Those corresponding with the 

 primary septa are independent throughout their course, but those corresj^onding with the septa 

 of lower orders are united in a series of figures like the Greek letter 'b, by successive bifurcations. 



Calicular margin nearly circular. The calicle though deep is much filled up by the septa etc. 



Septa elegantly and copiously denticulate, slightly exsert, arranged very regularly in six 

 systems and four cycles. Those of the first cycle, which are somewhat the largest, are inde- 

 pendent and may unite with the small columella. Those of the third c)cle though not quite 

 so high as those of the second cycle are larger than the latter (secondaries) and meet in front 

 of them (secondaries) so as to exclude them from the columella. The point of union of the 

 tertiary septa is very conspicuously marked by a large, high, \^-shaped paliform lobe. 



These six V-shaped pali, formed by the union of processes of the tertiary septa, but 

 standing opposite the septa of the second order, are the only pali present. Like the septa they 

 are echinulate. 



The septa of the fourth cycle, though much smaller and somewhat less exsert than 

 the others, descend deep into the calicle. 



The columella consists of two or three contorted granular processes fused together : 

 superficially it unites with the bases of the six upstanding pali, and much deeper down it may 

 unite with the six primary septa. 



Height of the corallum 8 millim. Diameter of the calicular orifice 6.5 to 7 millim. 



25. CitharocyatJws vcntisfits, n. sp. Plate III, fig. 19, \ga. 



Stat. 59. io°22'.7S. 123^ i6'.5 E. 390 m. 4 Ex. 



This species is essentiall)- similar to Citharocyatlius coiiicns, but differs from it in several 

 particulars which are quite independent of age. 

 These particulars are as follows. 

 (i) The cylindro-conical corallum is slenderer and considerably more elongate. 



(2) The septa of the first three cycles are strongly exsert, in striking contrast to those 

 of C. coniais. (Those of the first cycle are the most exsert and those of the third cycle the least so). 



(3) Though the septa are by no means smooth, they are much less conspicuously denticulate. 

 The height of the largest of the 4 specimens is 10.5 millim., and the diameter of its 



calicular orifice is 6 millim. 



Some fragments from Station 159, 411 metres, which I was at first inclined to refer 

 to the genus Conocyathus, probablj- belong to this or to the preceding species. 



