134 : M. T. C. Winkler on 
was engaged in describing a new species of Macrurous 
Decapod Crustacea, which not only represented a new genus, 
but at the same time would form, side by side with the Pali- 
nuride and the Scyllaride, a new subfamily of the family 
Loricata. Ashe did not know whether there were any genera 
of fossil Crustacea analogous to or identical with the new 
genus, M. de Man begged me to compare the latter with the 
remains of fossil Macrurous Crustacea contained in the 
paleontological collection of the Musée Teyler. I immedi- 
ately set to work. I compared with the diagnosis of the new 
species and the figure of the specimen which were given to 
me by the above-mentioned naturalist all the examples of fossil 
Macrurous Crustacea which existed in the museum confided to 
my care. This comparison, however, did not entirely satisfy 
me; the Musée Teyler, rich as it may be in fine remains of 
fossil Crustacea, does not possess all the known species de- 
scribed by those paleontologists who have devoted themselves 
to carcinological researches. Fortunately the magnificent 
Teylerian library is at my command. I had to read all that 
has been written on the Macrurous Crustacea in the works of 
which a list will be found in the footnote, pp. 133, 134. 
This investigation has convinced me that there is certainly 
no identity between the genus Arcosternus, De Man, and any 
of the genera of Crustacea that lived in the past geological 
ages. But, although it is different, there is at the same time 
a very great analogy between this recent genus and the fossil 
1858. Eratton, in the Bulletin de la Société Géologique de France, 
Ye série, tome xvi. 
1859. OpprL. Der mittlere Lias Schwabens. : 
1860. OpPEL, in the Jahreshefte des Vereins fiir vaterlandischer Natur- 
kunde in Wirttemberg, Band xvii. 
1861. Erauiton. Notes sur les Crustacés jurassiques. 
1862. OpprL. Paleontologische Mittheilungen. 
1864. F. von AtBertrI. Ueberblick tiber die Trias. 
1867. QuENSTEDT. Handbuch der Petrefaktenkunde. 
1874. ScHLUTER, in the Verhandlungen des naturhistorischen Vereins 
des Rheinlands und Westfalens, Band xxxi. 
1881. Dr Man, in Notes from the Leyden Museum. 
1881. Dr Man, in the Tijdschrift voor Entomologie. 
1881. WINKLER, in the Archives du Musée Teyler, 2° série, tome i. 
Besides the works mentioned, the following may be studied :— 
Brit. Fossil Malac. Crust. of Great Britain. 
Edinburgh Journal, vol. xix. 
Dictionnaire des Sciences Naturelles, tom. xxxyii. 
Kocu und DunkeEr. Beitrage zur Palzeontologie. 
F. von ALBERTI. Gebirge Wiirttembergs. 
Neues Jahrbuch (Leonhard und Bronn), 1835, 1836, 1837, 1842, 1849, 
1851, 1852, 1853, 1854, 1855, 1857, 1861, 1870, 1874. 
