330 PEOF. T. E. JOKES ON THE OSTEACODA 



species of CytJiere, C. transiens and C. retirugata. Of these, the 

 latter occurs in the lowest Purbeck beds in two of the stone-pits at 

 Hartwell, near Aylesbury, namely the " Bugle pit " and *' Barnard's 

 pit.'' A variety, or the male form {rugulatci), of C. retirugata, 

 occurs both in the last-mentioned quarry and in similar low Purbeck 

 (if not really estuarine Portland) beds in other pits near by. 



The mingling of what seem to be freshwater with marine species 

 in these lowest strata is a subject of much interest, and will require 

 further attention and close study of the succession of strata. C. 

 transiens has been found also in white, soft, Portland Stone, from 

 Brill in Bucks. 



rV. Purheck Beds near Mountfield and Poundsford, Sussex. 

 The overlying Cypridiferous shales near Mountfield contain 

 Cypridea valdensis, Dariuimda leguminella, and Cypridea Austeni (?), 

 and belong to the Wealden series ; but the limestones that have 

 been brought up from the old pits at Limekiln Wood, near by, 

 contain Purbeck species, thus : — 

 63. Light-coloured limestone [gramdosa Sow 



25, 286, 312, 346. Solid bluish limestone, apparently composed of 

 Cjprid.ee, and showing them as casts and moulds on the 

 weathered surfaces punctata ? 



307. Blue shale, with a thin layer of the small boteUoid oolite 



which is seen in. Purbeck specimens from Teffont, &c In the ghale,^ 



Dunkeri? 

 Oyster-bed. Ostracods, chiefly casts, weathered out free... Cythere? Sec. 



In ironstone at Poundsford we find Cypridea valdensis (?), Dar- 

 winula leguminella, and insect-remains. 



Piirhecl' hedsfrom the Suh-Wealden Boring at NetTierfield. 



390, 411, 412. Dark grey impure limestones, at 85 feet and 96 \punctata, 



feet depth J with Chara. 



Y. The late Mr. Charles Moore's Specimens from the Purheck 

 Beds at Sivindon, Wilts. 



Li the ' Proceed. Geol. Assoc' vol. iv. 1876, pp. 544-546, there 

 is an account of the late Mr. Charles Moore's discovery of many 

 fossils in the Purbeck beds in the Great Quarry at Swindon ; and 

 among the fossils mention is made of four or five species of Cypris. 



The Eev. H. H. Winwood, P.G.S., has been so good as to look 

 for these fossils in the Bath Museum ; and from among C. Moore's 

 Upper-Oolite collection he has sent me six little glass tubes con- 

 taining Ostracodal valves. On examination, these prove to be similar 

 to other Purbeck species. Thus : — 



Tube 59. Cypridea punctata, ordinary ; and C. JDimheri, with 

 very strong beak and notch. C. Dunheri is much more 

 numerous than the other. About 90 altogether. 



Tube 60. Gythere retirugata and its var. rucjulata ; ordinary ; about 

 60. 



