326 Reviews—-Cybium Bleekeri. 
Coal-measures. Lobsters are well represented by numerous genera 
and species from the Trias to the present day, when they are found 
ali over the world, both in Freshwater and Salt. Many of the 
Oolitic forms of Eryma must be closely related to the living Cray-fish 
(Astacus fluviatilis) of our own rivers and brooks; whilst the Chalk 
Clytia Sussexiensis with its spiny carapace and body-segments is 
probably represented to-day by the living spiny Australian Crayfish 
(Astacus armatus) of the Murray River. 
Of the Schizopoda, one form, Pygocephalus Cooperi, from the Coal- 
measures, probably belongs to this division. Squilla may even 
occur in the Carboniferous formation; but true Squillas certainly 
are met with in the Solenhofen Limestone, Bavaria, and in the 
Cretaceous of the Lebanon, Syria. 
Passing over the Cumacez, we come next to the Isopoda, a group 
of great importance and vast extent. 
In individuals as well as in species the Isopoda may be counted 
by myriads, and they occupy as scavengers, along with the Amphi- 
poda, a most important place in the economy of nature whether by 
land or sea. 
Isopods occur as far back in time as the Devonian, and they are 
well represented in Secondary and Tertiary rocks. 
If Dr. Woodward is correct in his conjecture that the Isopoda are 
the modern modified descendants of the ancient Trilobites, for which 
there is a considerable amount of evidence, then the Isopoda date 
back their ancestry to Cambrian times, the Trilobita living on to 
the Carboniferous period. 
The Amphipoda so numerous at the present day all the world 
over, both in freshwater and salt, are comparatively rare as fossils. 
One form, Necrogammarus Salweyi, occurs as far back as the Upper 
Silurian; Gampsonyx is found in the Coal-measures; Prosoponiscus 
in the Permian, and there are several others in Secondary and 
Tertiary rocks. 
But our space, like Mr. Stebbing’s, is limited, and we must say 
adieu to the author, merely observing, that so useful a book as he 
has produced, needs, like good wine, no bush to make it attractive. 
It should form a part of every scientific and reference library, and 
as it is one of the volumes of the “ International Scientific Series,” 
it will go, as a matter of course, far and wide, and find itself in 
many distant libraries all the world over. It will occupy an honour- 
able place alongside Prof. Huxley’s ‘“ Cray-fish,” and will we trust, 
become converted, by a happy conjunction of activity on the part of 
the author and publishers—like one of the Desmidiacee—into a pair 
of volumes before another eighteen months has passed away. 
Ij.—Sur tz Creiu (Hxcnopus) Brerkrrr pu Trrrain Brux- 
ELLIEN. By Raymonp Srorms. Bull. Soc. Belge Géol. Paléont. 
Hydrol. Vol. VI. (1892), pp. 8-14, Pl. I. 
WELL-PRESERVED cranium of the Scombroid fish, Cybium, 
was discovered last year by M. Vincent in the Bruxellian for- 
mation at Fonteny, near Gemappes, and this forms the subject of 
ae 
