576 GEOFFREY SMITH. 
penultimate joint. The abdominal appendages had a long 
basal segment and a terminal flabellate segment clothed with 
lone sete. 
(=) 
The telson was an elongated pointed spine fringed with 
ro) (=) 
long sete. The uropods, which consisted of external and 
internal rami, were also lone and pointed, and they were 
’ oD a 
fringed with long sete. 
Occurrence.—Coal measures of Illinois. 
Genus Nectotelson (Brocchi 19). 
N..rochei from the Permian of Autun, France. Only very 
badly preserved specimens known. 
LITERATURE, 
1. Jordan and V. Meyer.—‘ Ueber d. Steinkohlen-formation von 
Saarbriicken,” ‘ Paleeontographica,’ vol. iv, 1856. 
2. Meek and Worthen.— Proc. Acad. Nat. Sci. Philadelphia,’ 1865, 
p. 41. 
‘Report Geol. Survey Illinois,’ 1868. 
. Packard.— American Naturalist,’ vol. xix, 1885, p. 790. 
‘Mem. Nat. Acad. Sci. Washington,’ vol. iii (2), 1886. 
‘Proc. Boston Soe. Nat. Hist.,’ vol. xxiv, 1889. 
. Thomson.— Linn. Soc. Trans.,’ London, 2nd ser., vol. vi, part 3, 
1894, p. 285. 
8. Calman.— Roy. Soc. Edin. Trans., vol. xxxviii, part 4, 1896, 
p. 787. 
‘Ann. Mag. Nat. Hist.,’ 7th ser., vol. xiii, 1904, p. 144. 
10. Sayce.—‘ Victorian Naturalist,’ vol. xxiv, p. 117, 1907. 
‘Linn. Soe. Trans.,’ London, vol. xi, Part I, 1908. 
12. Smith.—‘ Proc. Roy. Soc. London,’ B, vol. Ixxx, 1908, p. 465. 
13. Woodward.— Geological Magazine, decade v, vol. v, No. 9, 1908, 
p. 385. 
14. Hansen.— Ann. Mag. Nat. Hist.’ (6), xii, 1893, p. 417. 
15. Geldert.— La Cellule,’ t. xxv, fase. 1, 1906, p. 7. 
15. Woodward.— Geological Magazine,’ 1881, p. 533. 
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