156 Dr. W. T. Caiman — Pleurocaris, a new Crustacean 



EXPLANATION OF PLATES IX AND X. 



(All figures magnified 12 diams.) 



Plate IX. 



Fig. 1. Pavolunulites scandens, sp. nov. Part of a good-sized specimen. 



Seaford. 

 ,, 2. Ditto. A specimen which was easy to clean out and shows the 



foramina in the back wall. Seaford. 

 ,, 3. Ditto. Back of a small specimen. Seaford. 

 • ,, 4. Ditto. Back of a larger specimen showing at one point traces of the 



marginal growth-outline not obliterated in the centre of the zoarium. 



Seaford. 

 , , 5. Pavolunulites declivis, sp. nov. Part of a large fragment. Trimingham. 

 ,, 6. Ditto. A small fragment. Trimingham. 



Plate X. 

 Fig. 7. Pavolunulites subquadrata, sp. nov. Nearly the whole of a zoarium. 

 Seaford. 

 ,, 8. Ditto. A zoarium. Basing Park, Hants. 

 ,, 9. Ditto. Back of a zoarium. Seaford. 



,, 10. Lunulites Marssoni, nom. nov. A fragment. Trimingham. 

 ,, 11. Ditto. Part of another fragment. Trimingham. 

 ,, 12. Ditto. Back of another fragment. Trimingham. 



III. — On Pleurocaris, a new Crustacean from the English 



Coal-measures. 

 By W. T. Calman, D.Sc. 

 f| THROUGH the kindness of Mr. Walter Egginton I have recently 

 1_ had an opportunity of studying an interesting series of Crustacea 

 from the Coal - measures of Coseley, near Dudle)-. Most of the 

 specimens can be referred, with more or less probability, to the 

 division Syncarida, which includes the living Anaspides and its 

 allies, and among them are some which I regard as representing a new 

 genus. Although the fossils, which are contained in nodules of clay- 

 ironstone, often show very minute details of structure in a beautifully 

 perfect state, it is just those features most important from a morpho- 

 logical point of view that are most frequently obscured. There are 

 many essential points that cannot be determined from the material at 

 my disposal, and the conclusions drawn as to the systematic affinities 

 of the genus must therefore be regarded as to some extent provisional. 



Sub-class MALACOSTRACA. 

 Division SYNCABIDA(?). 

 Pleurocaris annulatus, g. et sp. n. 1 

 The body measures approximately 14 mm. in total length, and 

 2*9 mm. across the widest part. It is extended or only slightly curved 

 ventrally, and the dorsal surface is exposed in all the specimens. 



The head is obliterated in all the specimens seen, and only impressions 

 of some of its appendages are preserved. What appear to be the basal 

 segments of the antennules are seen in front, on either side of a small 

 triangular median plate. Behind these is a stout antenna with a 

 peduncle of three (?) segments and a portion of a flagelluni showing 



1 For a diagnosis of the genus see p. 160. 



