CYTHERELLA OVATA. 45 



CxTHEEE AMXGDALOiDKS, var. BEETis (?), Comuel. Mem. Soc. geol. France, 



ser. 2, vol. ii, pt. 1, p. 199, 

 pi. viii, fig. 12. 

 — OYATA, Beuss. Haidinger's Nat. Abhandl., vol. iv, pt. 1, 1851, p. 48, 



pi. V, fig. 2. 

 CxTHEEELLA COMPLANATA, Reuss. Donksch. Akad. Wiss. Wien, vol. vii, 185i, 



p. 140, pi. xxviii, fig. 9. 



— OTATA, Bosquet. Mem. Comm. Carte geol. Neerl., vol. ii, 1854, 



p. 45, pi. viii, figs. 1 «— ^. 



— — Jones. Geol. Mag., 1870, p. 76. 



— — Beuss. Elbthulgeb., &c., pt. 2, 1874, p. 151, jjI. xxviii, fig. 4 



(fig. 5?). 



Length -85 ; lieiglit -55 ; thickness -35 mm. 



This common and easily distinguished species has been variously referred to 

 and mentioned by many geologists at home and abroad, and especially studied by 

 Reuss and Bosquet, with mutual agreement as to details except that Reuss retains 

 his C. elongata from the synonymy. 



Several of the old figures are reproduced here on a reduced scale from the 

 ' Monograph ' of 1849. 



Fig. 48 = fig. 24 a. 



Fig. 49 — fig. 24 h. 



F'ig. 50 = fig. 24 c. 



Fig. 51 = fig, 24 e. The notches at the ends are too large. 



Fig. 52 = fig. 24/. 



Fig. 53 = fig. 24 h. This should not be perfectly oval, but slightly flattened 

 on the right-hand margin, as looked at in the figure. M. Bosquet, who had seen 

 such nearly oval specimens, suggested that they may be sub-adult individuals ; 

 perhaps they are varietal forms. See PL lY, fig. 39. Mr. J. Kafka figures an 

 oval form from the Cretaceous strata of Bohemia in A. Fritsch's ' Crustaceen 

 bohm. Kreidef.,' 1887, p. 18, fig. 40 c. 



Fig. 54 = fig. 24 i. A small and probably young form. 



Localities. — Ghalh ; Norwich, Horstead, Colchester, South-east England, 

 Magheramorne (Antrim), Keady Hill (Londonderry) ; ChalJc-roclc, Dunstable, 

 Chinnor, West Wycombe, Luton ; Chalk-marl, Dover, Didcot ; Detritus, Charing ; 

 Goult, Folkestone, Leacon Hill, and Godstone ; Oreensand, Cambridge. 



Foreign. — Chalk, Maastricht, North Germany, Bohemia, Weinbohla (Saxony), 

 Royan (South France), Dobrutscha, &c. ; ? Neocomian, France. 



This is a widely distributed Cretaceous species. The localities were carefully 

 recorded by Bosquet in 1854, and by Reuss in 1874 (' Elbthalgebirge,' &c., pp. 

 151, 154). 



