92 



are rauch the largest and most exsert, dividing the calicle into 

 ten perfectly equal compartinents ; those of the fourth cycle are a 

 little larger and a good deal more exsert than those of the third. 

 Pali 10 ia number, opposite the septa of the third cycle: they 

 have the form of large upstanding curls, just like the ringlets 

 that compose the columella of most Caryophylliae. 



Columella large, rather deep-seated, made up of numerous cincinni. 

 The thecal wall is stained with purple-browu near the calicular 

 margin, beyond which it has a striated appearance owing to the 

 costae being alternately darker and lighter. 



Greatest height of corallum 15 millim. 

 Major diameter of calicle 10 » 

 Minor » » » 8 » 



5. Ceratotrochus venustus n. sp. 



Corallum unattached, acutely conical, straight, a little compressed, 

 thick-walled. 



Costee equal, in the form of very thin microscopically-serrate 

 carinae, which extend from the calicular margin to the acuminatebase. 



Calicular orifice horizontal, the fossa deep. Septa in six systems 

 and five cycles, the fifth cycle being undeveloped in two of the 

 half-systems. Those of the first cycle are preeminently large and 

 exsert, besides being thicker than the others; those of the other 

 four cycles diminish successively in size and exsertion from the 

 2 D(1 to the 5 th . All the septa are straight and finely and sparsely 

 granular, and all but those of the first cycle have the edge, 

 within the calicular fossa, slightly sinuous. 



Columella deep-seated, consisting of a fair number of twisted 

 pinnacles arising from a basal network. Only the septa of the 

 first two cycles meet the columella, and then only at a great 

 depth in the calicular fossa. 



Height of corallum 10 millim. 



Major diameter of calicle 9 » 

 Minor » » » 8 » 



