Septa narrcnv, not much encroaching on the calicular fossa, slightly sunken below the 

 calicular margin where they are immersed in a zone of stereoplasma. 

 Calicular fossa deep ; septal loculi open to the base. 

 Columella of good size, loosely reticular or spongy, deep-seated. 

 No pali or paliform lobes of any sort. 



II. Lochiuccotrochus oaileus n. sp. Plate II. fig. 9, 9^;. 



Stat. 259. 5°29'.2S., i32°52'.5E. 487 m. 3 Ex. 



Stat. 159. o°59'.iS., 1 29° 48'. 8 E. 411 m. Some dead and broken fragments. 



The colony has the shape of a small irregular bush, formed by budding (often dicho- 

 tomousl}') in several planes and up to the fourth generation. The budding takes place near 

 the calicular margin, is fairly regular, and is a true gemmation. 



An individual corallum when nearly fullgrown is cylindro-conical, sometimes straight, 

 but usually a little curved. It is invested by a granular epitheca, which rises higher than the 

 septa and forms a sharp rim or lip round the circular calicular orifice. The epitheca may 

 entirely conceal the costa;, or may, at any rate in the lower half of the wall, leave faint 

 traces of them. 



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



The septa, which are all of a height, are sunken and are separated from the over- 

 hanging epithecal lip by a well defined ring-groove. They do not project much into the calicle, 

 and appear less salient than they really are because superiorly they are imbedded in a zone 

 of stereoplasm. They are usually 36 in number, every alternate one reaching the columella. 

 They are arranged in si.\- s)stems and four cycles, the fourth c)-cle however being developed 

 in only one half of each of the six systems, and the tertiary septa being enlarged in the six 

 half-systems in which the fourth cycle exists. Thus the arrangement of the septa may be called 

 regularly irregular. Ultimately, however, the septa reach the full number of 48, in six regular 

 systems of four complete cycles. 



The columella though deep-seated is large and prominent ; it is fairly circular and 

 consists of a loose spongy reticulum. 



An average nearly full-grown corallum, with 36 septa, is 12 millim. long, the diameter 

 of its mouth inside the prominent epithecal lip being 7 millim. Specimens with the full number 

 of 48 septa are a little larger. 



Though this species lies within Martin Duncan's division of Turbiyiolidcc Gcntmantes, 

 it is, as I have stated in the introduction, merely a compound Ccratotrochzis (Conotrochus)^ 

 and at first I was inclined to regard it as identical with Ceratotrochus (Pklosocyat/msJ hospes, 

 which species again is but little different from CcratotrocJms (Co7iotrocJms) funicoltcnina. 



From Canocyatlms Edw. & H. Lochmccotroclms is readily distinguished by the absence 

 of pali, and from Gcnnuulatroclnis Duncan by the well-developed columella. 



