Jones and Sherhorn — Tertiary Entoniostraca. 387 



p. 132, pi. xi. figs. 54-56; or A J ohtusata, G. S. Brady, " Eeport 

 Challenger Ostrac," p. 35, pi. xxx. fig. 8. 



5. Btthocypkis subrenifokmis, sp. nov. 



In the genns Bythocypris, determined by G. S. Brady, in " Eeport 

 Challenger Ostrac," 1880, the left valve is described as much 

 larger than the right, and overlapping it above and below. In this 

 character, and other features, a, specimen from the " Belosepia-bed " 

 at Bracklesham (Science Schools Coll.) coincides. It approaches 

 Cytherina abhreviata, Reuss, " Haidinger's Nat. Abh.," vol. iii. p. 52, 

 pi. viii. fig. 10 ; but it is too short and too high, and is not so reniform. 

 It has the usual kidney-shape, and is also near B. remformis, G. S. 

 Brady, " Eeport Challenger Ostrac," p. 46, pi. v. fig. 1 ; but this 

 figured form is too short, and more incurved on the ventral edge 

 than is our specimen. 



6. PoNTOcvPRis (?), sp. 



A single, small, pitted valve, of uncertain alliance, but approxi- 

 mately like some members of the genus Pontocypris, G. 0. Sars, 

 occurs in a collection from the Tertiary beds at Colwell Bay. 



7. Bairdia subdeltoidea (Miinster), Jahrbuch. fiir Min. etc. 1830, 



p. 64 ; and 1835, p. 446. 



(For synonyms see Monogr. Tert. Entom. p. 52.) 



As mentioned in the Geological Magazine for 1870, p. 157, the 

 little Bairdia from the Crag (' Monogr. Tert. Entom.,' 1856, p. 52, 

 pi. iv. fig. 2) may be B. fusca, G. S. Brady, ' Trans. Zool. Soc' vol. v. 

 p. 364, pi. Ivii. fig. 9 ; and the fine species from the London Clay 

 (' Monogr.' p. 52, pi. vi. fig. 1) is probably i?. subtrigona, Bornemann, 

 ' Zeitschr. deutsch. geoL Ges.,' vol. vii. p. 357, pi. xx. fig. 4. 



We have now from the Bracklesham Belosepia-bed (Science 

 Schools Coll.), a very fine example of the real suhdeltoidea, which we 

 have compared with authentic specimens from Osuabriick, sent by 

 Count Miinster to London many years ago. 



With the Bracklesham specimen is a smaller individual, relatively 

 thicker and rounder ; it may belong to a different species, but for the 

 present we leave it as a variety. 



8. Bairdia suhtrigona, Bornemann. PI. XI. Fig. 1. 



B. subdeltoidea, Jones, Monogr. Tert. Entom., 1856, p. 52, pi. vi. fig. 1. 

 This specimen from the London Clay is re-figured from the above- 

 mentioned Monograph. As mentioned in our description of B. 

 subdeltoidea, Ave now refer this species to Bornemann's B. subtrigona. 



9. Bairdia Londiniensis, sp. nov. PI. XI. Fig. 2. 



This is a small neat Bairdia, of a not unusual form, but not 

 exactly matching in shape any species known to us ; it is moreover 

 denticulated at the end margins, and punctate all over with very 

 distinct, roundish, close-set pits. This valve is stained with nume- 

 rous bright orange-irony spots, which possibly may be traces of the 

 original colouring of the shell. 



