196 E. Wethered—Structure of Jurassic Pisolite. 
Total length from 30 to 35 millimetres; width from 8 to 9 mm. 
_ Upper Greensand, Cambridge; Woodwardian Museum. | 
To one of the specimens (Figs. 5 and 7) Prof. Seeley attached as a 
-MS. label Squilla McCoyi, and this name is quoted by Mr. Jukes 
Browne in the list of fossils contained in his paper ‘On the Cam- 
bridge Gault and Upper Greensand’ (Q.J.G.S. May, 1875). The 
subsequent occurrence of two other specimens has enabled me to 
determine that the fossil so named is the pleon of the Isopod now 
described. 
Palega McCoyi is quite distinct from all other described fossil 
Isopods, although it bears considerable resemblance to several recent 
forms. I have provisionally referred it to the genus Palega, 
established by Dr. H. Woodward (Grou. Mae. 1870, p. 495). Some 
characters suggest a reference to the recent genus Cirolana, but the 
tribe to which it really belongs cannot be determined until the 
details of the cephalic and abdominal appendages are known; in 
the absence of this knowledge it is not possible to decide whether 
it should be referred to the Agide proper, or to the Cymothoide. 
With reference to these tribes, as regards living species, a most 
valuable and exhaustive series of articles, illustrated by numerous 
plates, have been published in Naturhistorisk Tidsskrift (Copenhag.), 
Bad. xii. xiii. xiv. 1879-84, ‘Symbole ad Monographiam Cymotho- 
aru,’ by J. C. Schicedte and Fr. Meinert. These authors also pub- 
lish a paper in the same series, ‘De Cirolanis A/gas simulantibus 
commentatio brevis,’ Bd. xii. 1879-80. 
DESCRIPTION OF PLATE VI. Figs. 1—7. 
Fic. 2. Palega McCoyi, Carter. Showing the cephalon (crushed), the pereion, and 
the anterior segments of the pleon. nat. size. 
aaa sly Me Be 30 Cephalon, first, and portion of second segment 
of pereion. nat. size. 
apy shee 45 a is The same specimen as Fig. 1, but enlarged. 
ponliidls a AS Fs Posterior portion of pereion, the pleon and 
' the telson, with impression in the matrix of 
uropodite, nat. size. 
The same specimen as Fig. 7, but enlarged. 
Uropodite. enlarged. 
Restoration of entire form. 
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IJ.—On toe Microscopic StructurE oF THE JURASSIC PISOLITE. 
By E. WetuHeren, F.G.S., F.C.8., F.R.M.S. 
(PLATE VI. Figs. 8—11.) 
HE specimens of pisolite which I have examined were obtained 
from two horizons, namely, the Coralline Oolite and base of 
the Inferior Oolite near Cheltenham. The pisolites are well known 
and have frequently been referred to by authors as fine types of 
oolitic granules, and in proof of this I may quote from Mr. H. B. 
Woodward’s last edition of his Geology of England and Wales. 
Speaking of oolite granules the author says (p. 281), “ When these 
