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placed at nearly equal distances, and almost in straight lines : the lines 
of articulation preserving the same direction. This specimen, I have 
reason to believe, is from Wenlock Edge, to which place, or rather 
to its fossil productions, I shall soon have to recur. In another sped’ 
men, not marked with sufficient distinctness to be employed as a subject 
for delineation* a middle state, as it were, is to be observed. The 
minute openings, as well as the lines of articulation, are disposed with 
much less regularity than in the specimen just described, but with con- 
siderably more than in the preceding. 
In Knorr’s elegant work, a fossil is depicted which is evidently of 
the same species with those which are here figured ; the regularity with 
which its lines of articulation and its small openings are disposed ren- 
dering it most like that which is represented Fig. 8. From the re- 
marks of Mr. Walch on this fossil, we learn that it was obtained from 
the Isle of Gothland ; and that its specimens are sometimes, as is the 
case Avith Fig. 6, pervaded with a tinge of red. They differ much, he 
observes, in thickness as well as in length ; some being not more than 
half an inch, whilst others are two inches in thickness ; they vary also 
in length from one to five or six inches. It is, however, well de- 
serving of remark that, according to Mons. Klein’s account, the 
limeburners of Gothland often find these entrochi of the length of an 
ell. Their central opening, Mr. Walch observes, varies as in the 
other entrochi, being sometimes circular, and sometimes, though 
very rarely, stellated. It is only with the assistance of a glass, he 
observes, that the lines of connection between the trochites, as well 
as the numerous little openings between these lines, are to be plainly 
seen. Of these openings, he says, it is observable that they pass 
through the substance of the trochites, and open into the central ca- 
nal; and in general, he says, they do not bear any marks of having 
given off branches ; although, he observes, it is certain that some, at 
least, do ramify ; since, in a specimen which he possesses, there is a 
ramification, which is given off from the larger trunk, possessing similar 
