338 Professor T. Rupert Jones — 



to remove both this and some Carboniferous forms, which have been 

 ranged under Polycope in the Monograph above mentioned, to a new 

 group. The gradations are noticeable, and the difficulty of getting 

 perfect specimens is very great. We therefore now merely record 

 and illustrate the specimen, waiting for better material. 



2. Ctpkosis Haswellii, gen. et sp. nov. Plate IX. Figs. 6a, 6&. 

 Length, -^ inch. 



The late Mr. G. C. Haswell, of Edinburgh, noticed and figured ^ 

 (indifferently) an interesting and unique internal cast of an Ento- 

 mostracan valve in olive-grey Upper-Silurian mudstone, from the 

 west side of the North-Esk Eeservoir in the Pentland Hills. 



This specimen Mr. Haswell kindly allowed me to examine and 

 sketch ; and my view of its characters and relationship is as 

 follows : — 



It is a slightly convex cast, representing the left valve of a 

 Cypridinad, naturally indented at the posterior third by a strong 

 transverse sulcus, and by a fainter impression across the anterior 

 third. It is ovate in outline, subacute behind (rather too blunt in 

 the drawing), and distinctly beaked and notched in front. 



Eegarding the transverse furrows, especially the hinder sulcus, as 

 zoological features, probably of physiological value, I venture to 

 distinguish this form, rare and poor as it is, by a new name, and 

 dedicate it to the memory of its enthusiastic discoverer. 



The observations on this specimen recorded by Mr. Haswell are as follow : — At 

 page 42 of his Memoir above mentioned, he says : — "I found on the west bank of 

 the reservoir one specimen of the carapace of a crustacean, different from the pre- 

 ceding \_Leperditia ?], represented in plate 3, figure 13. It resembles in some respects 

 the more common forms of Cypridina. It is probably a new species, and specimens 

 should be looked for." At page 43, he adds : — " Since the above was in type I have 

 received the following letter from Professor E. Jones, with reference to the specimen, 

 plate 3, figure 13 : — " My dear Sir, — Mr. Henry Woodward has kindly sent me a 

 specimen for examination. It is a good and rare fossU, new to me. It is a 

 Cypridina, hardly separable from recent forms, such as Baird, Dana, and others 

 have described, as far as the appearance of this mould of one of the carapace- 

 valves will allow us to judge. The vertical indentation across the valve seems to be 

 natural, and may possibly indicate a generic or subgeneric difference. At all events, 

 you would be safe in using it as the basis of a specific name and distinction for the 

 present. Cypridina occurs freely in the Carboniferous rocks. Excepting one speci- 

 men of an allied form from the Lower [?] Silurian [Budleigh-Salterton pebble], this 

 of yours is the oldest I know. It is preserved in the same way as the Leperditia of 

 the Upper Ludlow beds of Shropshire. I congratulate you on having added such 

 a nice fossil to your collection, and on having brought forward so interesting 

 a species for Palaeozoic times. I have taken its measurement and outline as a 

 memorandum. Tours very truly, T. Eupt. Jones. [Yorktown, 1865.] To G. C. 

 Haswell, Esq." 



3. Cypkosina Whidbornei, nov. gen. et spec. 

 Plate IX. Figs. 1-3, and 5. 



Size of different specimens, in 20ths of an inch 



Unlike the two specimens described above, which are mere casts 



1 " On the Silurian Formation ia the Pentland Hills," Edinburgh, 1865, 8vo. 

 pp. 42 and 43, pi. 3, fig. 13. 



Length. 



Height. 



16 



11 



14 



9 



8 



4 



