386 Jones and Sherborn — Tertiary Entomostraca. 



Brady, in the 'Proceed. Zool. Soc. Lond,,' 1886, p. 90; and in the 

 * Journ. Linn. Soc.,' vol. xix. (1886), pp. 200, 201. 



1. Cypridea spinigera. (Sow.). 

 This is referred to at pp. 316, 333, 334, Quart. Journ. Geol. Soc. 

 vol. xli. as a species common in the upper part of the Weald Clay ; 

 and we now find that it occurs in Tertiary beds at Hempstead in the 

 Isle of Wight. Specimens, young or imperfect, from this locality 

 were figured in the "Geological Survey Memoir on the Isle of 

 Wight," 1856, as a sub-reniform Ostracod with a sharp spine on each 

 valve, CytJierideis unicornis (Jones). Careful examination of a 

 further series of specimens leaves no doubt that it is the same species 

 as that found in the Wealden beds. The Hempstead specimens are 

 not so well preserved as those in the Wealden Clays, nor are they so 

 abundant ; but, with the many individuals that have come under our 

 notice, we have been able to match old and young perfect examples 

 from the Tertiary and Wealden formations. 



2. Cypris incongruens, Eamdohr. 

 Cypris setigera, Jones, Monogr. Tert. Entora., 1856, p. 12, pi. i. fig. 6. 

 Candona compressa (Koch), Geol. Mag. 1870, p. 155. 

 To the localities of Berkshire and Cambridgeshire mentioned in 

 the Monograph, 1856, we have to add the Valley-drift of Fisherton 

 at Salisbury (Dr. Blackmore's Collection), Portland raised beach 

 (Prestwich), and lacustrian bed near Hitchin (W. Hill). 



3. PoTAMOOYPRis TRiGONALis (Jones) J and var. l^vis, nov. 

 We have two examples of this species from Mr. Clement Eeid's 

 Collection, — one from the Norwich Crag at Bramerton, — and one 

 from the Weybouru Crag at East Eunton.^ The latter specimen, 

 being larger and smooth, may be distinguished as var. l^evis. 



4. Aglaia ? CYPRiDOiDES, sp. nov. 

 The genus Aglaia, G. S. Brady (1868), one of the Cyprididce, has here 

 a fossil form provisionally referred to it on account of the similarity 

 of shape and condition of the valves. The muscle-spot, however, 

 is like that of Bairdia. Our example is from the Norwich Crag of 

 Bramerton, and was collected by Mr. Clement Eeid, F.G.S. It has 

 the usual curved form, and is delicately pitted. It is too broad in 

 shape for either A.'? glacialis, G. S. Brady, " Post-Tert. Entom.," 



' Mr. Clement Eeid, F.G.S., has given a detailed account of the Norfolk Deposits 

 in the " Mem. Geol. Survey; The Geology of the Country around Cromer," 1882. 

 TheWeybourn Crag is described at pp. 11 — 19; and the Entomostraca from that 

 deposit are mentioned at p. 66. See also Prof. Prestwich's Memoir on the Crag 

 Beds of Suffolk and Norfolk ; Quart. Journ. Geol. Soc. vol. sxvii. p. 457, 460, etc. ; 

 and H. B. Woodward's " Geology of England and Wales," 2nd edit. pp. 465-474, 

 for Bramerton, Weybourn, etc. The Bramerton Crag is also treated of in H. B. 

 Woodward's "Geol. Surv. Mem. ; The Geology of the Country around Norwich," 

 1881, pp. 33-55, 82, etc. The list of Ostracoda from Weybourn referred to above 

 does not agree with our determination in all respects. Thus we have not found 

 Cythere tuberculala, Sars, nor G. pellucida, Baird, among the specimens we have seen ; 

 and probably C. concinna, Jones, is represented by the set of the closely allied G. 

 angulata, Sars, which we have met with. Other species in our series are not indicated 

 in the printed list referred to. 



