Reviews — Fossil Crustacea. 325 



I^E^VIE-VsTS. 



I. — Fossil Ceustacea. 



1. E. Stolley. Uebkk zwei nede Isopodp;n aus nord-deutschen 

 Mesozoikum. 3 Jahresber. d. niedersiichsischen geol. Ver. zu 

 Hannover, 1910 [? 1913], pp. 191-216, Taf. vi. 



2. Ph. C. Bill. Ueber Crustaceen aus dem Voltziensandstein 

 DES Elsasses. Mitth. d. geol. Landesanstalt von Elsass- 

 Lothringen, Bd. viii, Hft. iii, pp. 289-338, Taf. x-xvi, 1914. 



1. Fossil remains of Isopoda are so rare and so little known that 

 considerable interest attaches to Herr Stolley' s detailed description of 

 two new species, Palcegajurassica from the Middle Jurassic (Dogger) 

 near Harzburg, and Urdu cretacea from the Middle Gault of Hannover. 

 The genus Falcega has not hitherto been recognized earlier than the 

 Cenomanian, but the author very justly points out that the name 

 covers an assemblage of more or less incompletely known forms which 

 may not be strictly congeneric. It may be added there is very little 

 reason for supposing that anj' of these forms belong to the family 

 ^gidse in the sense in which it is understood by modern zoologists, 

 and that the presence of ocelli on the dorsal surface of the head in the 

 new species, if it were confirmed, would be a character of far more 

 than the trifling importance which the author attributes to it. The 

 second species, Urda cretacea^ is referred to a genus hitherto known 

 only from the Kirameridgian of Solenhofen, and is described from 

 a specimen in which the segmentation of the body is more perfectly 

 preserved than in the case of the earlier forms. No new light, 

 however, is thrown upon the affinities of the genus. Here, as 

 elsewhere, it seems possible that something might result from a more 

 extended comparison with recent forms. 



2. Herr Bill has had the good fortune to discover, in the Upper 

 Bunter of Alsace, a Crustacean fauna hitherto practically unknown, 

 although one or two forms were very incompletely described long age 

 by H. von Meyer and others. Three of the new species are referred 

 to the Decapoda, and are of special interest as being among the very 

 earliest forms that can with certainty be attributed to that order. 

 The new genus ClytiopRis, in which two of the species are placed, 

 belongs to the tribe Nepliropsidea, which includes the recent Lobsters 

 and Crayfishes, and of which the oldest representative has hitherto 

 lieen the Liassic Enjma. The material was sufficiently well preserved 

 to enable the structure not only of the body but also of a good many 

 of the appendages to be described with considerable detail. The 

 third Decapod is one of the Penseidea, and is referred, provisionally, 

 to the genus Poxbhs. 



A new genus Schimpcrella, with two species, is based on some finely 

 preserved material which has rendered possible a fairly complete 

 account of its structure. It is referred to the ' Schizopoden ', by 

 wliich name, apparently, the author means only the Mysidacea. It 

 seems highly probable, although no brood-pouch has been detected, 

 that Schimperella really does belong to this order, of which no 

 representatives have hitherto been discovered to link the Carboniferous 

 forms with those now existinyr. 



