117 



of abundant stereoplasina. They are in six systems and four cy- 

 cles, the last cycle being absent in a few of the half-systeuis. 

 Those of the first cycle are slightly the largest. 



Most of the septa touch the columella, which though very 

 deep-seated is fairly prominent, and consists of about a dozen 

 low curling processes. 



The corallum of the uuique specimen is broken, so that its 

 height cannot be determined, but the maximum diameter of its 

 nearly circular mouth is close upon 9 millim. 



Locliuiaeotrochus, n. gen. 



Differs from PhJoeocyathus (= Pleurocyathus Moseley, which 

 Duncan regards as ïdentical with Ceratotrochus E. & H.) only in 

 forming a bush-like colony by budding — sometimes dichoto- 

 mously — near the calicular margin. 



2. Lochmceotrochus oculeus, n. sp. 



The colony bas the shape of a small irregular bush, formed 

 by budding (often dichotomously) in several planes and up to 

 the fourth generation. 



A separate corallum, when nearly fullgrown, is cylindro-conical, 

 sometimes straight, but usually' a little curved. It is invested by 

 granular epitheca, which rises higher than the septa and forms 

 a sharp lip rouud the circular calicular orifice. The epitheca may 

 entirely conceal the costse, or may leave traces of them. The 

 calicular fossa is deep, and its mouth is perfectly level. 



The septa, which are all of a height, are sunken, and are se- 

 parated from the overhanging epithecal lip by a ring-groove. They 

 do not project much into the calicle and are a good deal im- 

 bedded, superiorly, in a zone of stereoplasin. They are usually 36 

 in number, every alternate one reaching the columella. They are 

 arranged in six systems and four cycles. In old specimens the 

 septa are 48 in number, all four cycles being complete; but when, 

 as is commonly the case, only 36 are present, the fourth cycle 

 is developed in only one half of each of the six systems. 



