BIBLIOGRAPHY OF PALASOZOIC CRUSTACEA 105 
Shimer (II. W.) Almost complete specimen of Strennella strenua 
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, strenua is quite variable in the shape of the free 
cheeks and in the ornamentation of the axis. 
Shuler (EH. W.) New Ordivician Kurypterid. 
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. 
Paleontologisches Institut der Univ. Leipzig, 1898, pp. 37-138, 
Cambrian: Eurycare latum Ang. Peltura scarabaeoides Wahl. Sphaerophthalmus 
alatus Boeck. ae 
Silurian: Asaphus expansus Dalm. Cheirurus (Nieszkowskia) variolaris Lin. Remo- 
pleurides nanus c. Leucht. Agnostus glabratus Ang. Chasmops contcophthalmus 8. & 
B. Beyrichia costata Lin. Chasmops macrourus Sjogren, C. Wesenbergensis Schmidt. 
*Siemiradski (J. von). Die Paliozischen Gebilde Podoliens. ( Not 
seen. ) 
11 Paliontologischer Teil Wien Beitr. Pal. Geol., Ost Ung. 19, 1906, pp. 213-286, 
Tat: SV*xx. 
Siemiradzki (von Jos.) Die paleozoischen Gebilde Podolens, 
Beitriige Z. Pal. and Geol. ésterr-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 7, maximus, 
are here referred to Isotelus Lowenis Owen. 
Tsotelus Towensis Owen. Megalaspis Beckeri sp. nov. Compares M. gonioceras Meek 
and M. extenuata Angelin. 
Nileus vigilans Meek and Worthen. Bumastus Beckeri sp. nov. Thaleops ovata 
Conrad. Amphilichas rhinoceros sp. nov., A, clermontensis sp. nov. 
