BIBLIOGRAPHY OF PALA8OZOIC CRUSTACEA 105 
Shimer (H. W.) Almost complete specimen of Strennella strenwa 
_ Billings. 
Am. Jour. Science, vol. 23, 1907, pp. 199-201, figure. 
In the Amer. Jour. Sci., vol. 23, 1907, p. 319, the author refers Ptychoparia murron- 
atus Shaler and Foerste, Bull. Mus. Zool., vol. 16, plate 2, to Strenuella strenua Bill- 
ings, remarking that it appears that 8, strenuwa is quite variable in the shape of the free 
cheeks and in the ornamentation of the axis. 
Shuler (KE. W.) New Ordivician Eurypterid. 
Am. Jour. Sci., vol. 39, 1915, p. 551. 
Stylonurus (Ctenopterus) alveolatus p. 552, fig. in text 1-6, from the Bay sandstone, 
Walker’s Mt., Virginia. 
The subgeneric name of Ctenopterus was used on account of the long, flattened seg- 
ments of the endognathite; the lack of serrations on the segments, such as is found in 
Eurypterus; the presence of the long joint, belonging probably to the walking leg or 
balancer characteristics of Stylonurus, and the long, broadened spines or bristles which 
are especially characteristic of the subgenus Ctenopterus. 
Siegert (L.) Versteinerungs-fiihrenden Sedimentgeschiebe im Gla- 
cialdiluvium des Nordwestlichen Sachsens. 
Palzontologisches Institut der Univ. Leipzig, 1898, pp. 37-138. 
Cambrian: “Eurycare latum Ang. Peltura scarabaeoides Wahl. Sphaerophthalmus 
alatus Boeck. 
Silurian: Asaphus expansus Dalm. Chetrurus (Nieszkowskia) vartolaris Lin. Remo- 
pleurides nanus c. Leucht. Agnostus glabratus Ang. Chasmops conicophthalmus 8. & 
B. Beyrichia costata Lin. Chasmops macrourus Sjogren, C. Wesenbergensis Schmidt. 
*Siemiradski (J. von). Die VPaliozischen Gebilde Podoliens. ( Not 
seen. ) 
11 Palaontologischer Teil Wien Beitr. Pal. Geol., Ost Ung. 19, 1906, pp. 213-286, 
Taf. xv-xxi. 
Siemiradzki (von Jos.) Die palwozoischen Gebilde Podolens. 
Beitrage Z. Pal. and Geol. osterr-Ung. u. s. Orients, Bd. 19, Heft 2, vol. 3, 1906, p. 4. 
Six (Achille). Les appendices des Trilobites d’aprés M. Ch. D. Wal- 
cott. 
Soc. Geol. du Nord, Ann. xi, 1883-84, pp. 228-236. 
Slocum (A. W.) On the Trilobites of the Maquoketa beds of Fayette 
County, Lowa. 
Field Mus. Nat. Hist., No. 171, Geol. Ser., vol. 4, No. 3, pp. 43-83, plates 13-18, 1913. 
The author has secured from these beds 20 species of Richmondian Trilobites, 17 of 
which are here named, 11 of them being new. 
The new genus Cybeloides is also defined. 
The author describes and illustrates the following Crustacae: 
Isotelus gigas DeKay, I. maximus Locke, with the remark that most of the specimens 
of Isotelus from this locality, which have been referred by other authors to J. maximus, 
are here referred to Isotelus Iowenis Owen. 
Tsotelus Iowensis Owen. Megalaspis Beckeri sp. noy. Compares M. gonioceras Meek 
and M. extenuata Angelin. 
Nileus vigilans Meek and Worthen. Bumastus Beckeri sp. nov. Thaleops ovata 
Conrad. Amphilichas rhinoceros sp. nov., 4. clermontensis sp. nov. 
