ON CAdBONIFEKOUS ENCSINITES. 479" 



plates, which, perhaps, were situated on the base of the proboscis 

 on the opposite side to where it joins the anal plates. 



The stem is smooth ; the joints shorter near the summit, and 

 articulating by radiating ridges and furrows. In one specimen the 

 first side arm appears at a distance of eight inches from the head^ 

 is very small and nearly an inch from the next. At eleven inches 

 they become very numerous and larger. Another specimen showing 

 only the base of the stem has fifteen to twenty side arms in the 

 space of two inches, and it shows that the stem diminishes in 

 diameter towards the base. The plates from which the side arms 

 spring are rather thicker than the rest. One of these side arms, 

 detached, is four inches long. The plates composing the side arms 

 do not exactly fit one another as pointed out by De Kuninck. The 

 average length of the stems seems to be about thirteen or fourteen 

 inches. Length from top of column to top of proboscis 4-8 inch. 

 The rays were probably about the same length as the proboscis. 



Poteriocrmiis rii(/osiis (QrenieW). {See plate V2I.,fys.S, 4, 5.) 



I propose the above name for a new species of Poteriocrinus in 

 the Museum at Clifton College. It was found in the Lower Limestone 

 Shales in the' A von gorge,'and formed part of the Bernard collection. 



The body is conical, the base slightly concave, pentapetalous, the 

 edges crenulated. The lower edge of the basals partially overlaps 

 the base as shewn in PI. vii. fig. 5. An obscurely pentagonal, nearly 

 circular line marks the margin of the part of the column in which, 

 as in the recent Pentacrinas, the calcareous matter was more loosely 

 arranged, and which contained the longitudinal fibres. This portion 

 might conveniently be called the fibriferous area : it is well-marked 

 in Ehodocrinus. 



The iasals are five, wider than long, and shaped somewhat like 

 F.pUcatus. The alimentary canal is small and pentapetalous. 



The suh-radials are five — three pentagonal, the other two 

 hexagonal. All have their lateral articulations depressed, so as to 

 give a characteristic roanded shape to the plates. 



The radials are three, wider than long; they are rounded in the 

 same way as the sub-radials. The first articulates to the second by 



