398 Prof. T. R. Jones on the 



3. BytJiocypris HolUi^ Jones. 



Bythoci/pris Hollii, Jones, Ann. & Mag. Nat. Hist, ser, 5, vol. xix. 

 p. 184, pi. V. figs. 1 and 2, and pi. vi. figs. 3 and 4 ; Sil. Ostrac, 

 Gothland, 1887, p. 6. 



This fine species is represented in the drawings sent to me 

 by Prof. Lindstrom ; and several examples were among the 

 specimens obtained from the shale or marl of the brickyard 

 at Frojel and sent to me from Stockholm in 1886. 



Note. — Gytheropsis concinna, Jones (Ann. & Mag. Nat. Hist. 

 ser. 3, vol. i. 1858, pp. 249 and 254, pi. x. figs. 3 and 4), 

 was referred, I now think erroneously, to the smooth Pi-i- 

 mitice^ as P. muta {ojy. cit. vol. xvi. 1865, p. 425, and ser. 4, 

 vol. iii. 1869, p. 222). It was probably figured in a reversed 

 position ; and if looked at in the other position it may be 

 taken for a Bythocypris^ approaching B. testacella (Ann. & 

 Mag. Nat. Hist. March 1887, p. 186, pi. v. fig. 5) in shape, 

 though rather larger, being 1^ millim. long, instead of a very 

 little more than 1 millim. " C. concinna^'' figured and described 

 by Dr. Kolmodiu (Sverg. Silur. Ostrac. 1869, p. 21, pi. 0. 

 fig. 15), which is 1^ millim. long, may also be included in 

 the same category, as a possible Bythocypris^ if the convex 

 border be regarded as dorsal instead of ventral. 



IV. Kl(edenia, Jones & Holl, 1886. 

 (Ann. & Mag. Nat, Hist. ser. 5, vol. xvii. pp. 347 and 362.) 



1. KJoedenia apiciilata, sp. nov. (PI. XXI. figs. 1-5.) 



This Scandinavian Kloedema, from the uppermost strata of 

 Slite, in Gothland, is not far removed as to its general shape 

 and features from K. Wilckensiana *. In some individuals 

 of the new species the valves are much more oblong (figs. 3 

 and 4) and the dorsal angles are generally more acute. The 

 front and hind lobes rise much higher, reaching beyond the 

 dorsal border ; and this formation suggests the name apicu- 

 lata. The middle lobe, on the contrary, does not rise so high 



* This also belongs to the Silurian rocks of Scandinavia, being found 

 as well in place as in the drifted blocks of limestone in North Germany ; 

 Ann. & Mag. Nat. Hist. ser. 2, vol. xvi, pp. 82 and 89, pi. v, figs. 17-19 ; 

 figs. 20, 21, represent K. plicata, described at p. 90 as a variety, but 

 sufficiently diftereut as compared with the two other forms to be regarded 

 as specifically distinct. See A. Krause, in Zeitschr. deutsch. geol. Ges. 

 1877, p. 35, pi. i. figs. 18 a, b (18 b, K. plicata), and G. Renter, op. cit. 

 1885, p. 647, pi. xxvi. fig. 23, on the distribution of these Klcedenice. 



I 



