BIBLIOGRAPHY OF PALAEOZOIC CRUSTACEA. 209 



Schrenk (G. A.) Uebersicht des obernsilurischen 

 Schichten-Systems Liv- und Ehstlands, etc. 



In Archiv Naturk. Liv-, Ehst- u. Kurl., Dorpat, vol., 1854, pp. 35 and 86. 



Leperditia. 



The author describes and figures Cypridina grandis from the Silurian of 

 the Island of Oesel. This species is identical with Leperditia gigantea 

 Romer, 1858 (Barrande). 



Scouler (John). Description of a fossil crustaceous 

 animal. 



In Edinb. Jour. Nat. Geogr. Sci., vol. 3, 1831, p. 352, pi. 10.* 

 The author describes in this article, under the new generic name of 

 Eidothea, certain fragments of an Eurypterus. 



Account of some fossil Crustacea which occur 



in the coal formation (Argas). 



In Record of Geol. Sci. (Thomson's), vol. 1, 1835, p. 136. 



According to Capt. J. E. Portlock (Rep. Geol. Londonderry, etc., 1843, 

 p. 313), " Dr. John Scouler first noticed this remarkable Crustacean found 

 by him in the Carboniferous strata of Paisley; and, depending as a prin- 

 cipal character on the lateral caudal appendages, he pointed out its analogy 

 to the genera Cyclops and Apus. And a^gain, at the meeting of the British 

 Association at Glasgow, he described two species, one of which, Argas 

 tricornis, in all probability depends on an illusive appearance produced by 

 the overlapping of the crust of different individuals. ' Dr. John 



Scouler having subsequently altered his view of the affinities of the genus, 

 he now considers it a bivalved Crustacean, distinguished by not being 

 able to retract the tail within the shell, and hence has named it Dithyro- 

 caris, or bivalved shrimp, abandoning the original name as one already 

 preoccupied." 



The Rep. 10th Meeting Brit. Assoc. Adv. Sci., 1840, held at Glasgow, 

 does not contain in the index Dr. Scouler's name or that of the genus 

 Argas or Dithyrocaris. In the 5th Rep. of the "Committee on the Fossil 

 Phyllopoda of the Palaeozoic Rocks," 1887, the genus Dithyrocaris Scouler 

 is quoted on the authority of Captain Portlock as follows: "Dithyrocaris 

 Scouler in Portlock's Geol. Rep., Londonderry, etc., 1843," p. 313. 



Scudder (Samuel H.) Rhachura, a new genus of fossil 

 Crustacea. 



In Proc. Boston Soc. Nat. Hist., vol. 19, 1878, p. 296, pi. 9, figs. 3, 3 a. 



In the 5th Rep. to the Brit. Assoc. Adv. Sci., 1887, on the fossil Phyl- 

 lopoda by the committee, consisting of Mr. R. Etheridge, Dr. H. Wood- 

 ward and Prof. T. Rupert Jones, this new genus of S. H. Scudder is referred 

 to as probably that of Dithyrocaris Scouler, 1S43. 

 14 



