Bibliographical Notices. 133 
the Jenissei in 1875; and these yielded the new forms, Leperditia 
Nordenskjoeldi, Schmidt, Suppl. p. 25, pl. 3. figs. 29-382; L. waigat- 
schensis, p. 27, pl. i. figs. 33 a-c; and L. Lindstremi, p. 85, pl. v. a, 
figs. 17-20, with its variety mutica, p. 86, pl. v. a, figs. 21, 22. 
The second portion of this Part III. of the ‘ Miscellanea Silu- 
rica” deals with the Crustacean Fauna of the Hurypterus-beds of 
Rootzikill in the island of Qesel, at the mouth of the Gulf of Riga, 
Baltic Provinces. 
After some remarks (pp. 28-31) on the strata themselves, their 
fossil contents, and the results of their careful examination by him- 
self and others, M. Schmidt treats of the Hemiasprpm (pp. 31-34), 
with their history and characteristics, as shown in the three genera 
which he refers to this family, namely :—Pseudoniscus, Nieszkowski ; 
Henuaspis, H. Woodward ; and Bunodes, Kichwald. The last genus 
is described with three species :—B. lunula, Eichw., p. 35, pl. i. 
figs. 34-38, and pl. vu. figs. 1-6; B. Schrencki, Nieszk. (B. lunula, 
var. Schrencki, Nieszk., in the explanation of plate i. and in the 
Contents), p. 38, pl. i. figs. 839-43; B. rugosus, Nieszk., p. 39, pl. i. 
figs. 44-47.  Pseudoniscus aculeatus, Nieszk., is figured and de- 
scribed p. 40, pl. i. figs. 48,49. The organization and systematic 
place of the Hemiaspids are treated at pp. 48-46, 
The Evryprerm and their relationships are discussed at pp. 46— 
48, and the genus Hurypterus described, with two species (EZ. 
Fischert, EKichw., with its var. rectangularis, and E. laticeps), in 
detail, at pp. 48-64, pls. ii., iL, ili. a, and vi. figs. 6, 7. The history 
and structure of Pterygotus follow (pp. 64 &c.), with a detailed de- 
scription and full illustration of Pt. osiliensis, sp. nov. (pp. 70 &e., 
pls. iv., v., v. a, figs. 1-16, pl. vi. figs. 1, 2, 3 (var. laticauda), 4, 5, 
and pl. vii. figs. 7, 8, 10, 11, and five woodcuts). 
A few, but characteristic, specimens of a Ceratiocaris have also 
been discovered at Rootzikiill, in Oesel (p. 85); and these, carefully 
figured by M. Schmidt in his pl. vi. fig. 8 (telson and two lateral 
cercopods), fig. 9 (telson spine), pl. vil. fig. 12 (left valve of a cara- 
pace), have been referred by him to a new species, C. Netlingi 
(p. 84, with woodcut, fig. 5), which, as the author observes, is 
closely related to the English C. leptodactylus, M‘Coy. 
These two memoirs, so highly creditable to the Imperial Academy, 
as results of the paleontological research of one of its active mem- 
bers, have been written with care and exactitude, both as to the 
observation and collection of facts and the recognition and critical 
examination of the labours of other paleontologists. The printing 
is good, the woodcuts are neat, and the numerous and large plates 
are beautifully delicate, elaborate, and trustworthy. 
Proceedings of the Bristol Naturalists’ Society. New Series, vol. iy. 
part i. (1882-83). 8vo. 1883. 
Iy Natural History this Society has interested itself in many biolo- 
gical and physical subjects during the Session, as appears from the 
