WiTWHS.—Marsupitcs in Cretaceous of U'cstern AustraUa. 99 
described the American form as a distinct species under the name 
■Jf. americaniis. He says, however, (p. 100), “The only real differ- 
ence observable in the parts preserved is that In our species tlie 
brachials are sliorter and wider than in M. testudinarius, and if we 
had enough specimens with brachials attached to get an average, 
this might disappear. “ Further, “As in Lintacrinus, the resem- 
blance between the American and European forms is very great, 
and they may even be of identical species. ^ ’ 
The material from Western Australia consists only of detached 
and slightly Avorn cup-plates. One (PI. XI, fig. 10) is apparently 
a radial, and two others (FI. XI, figs. 9, 11) probably represent 
basals. The Aveathered plate (PI. XI, figs. 7-8) shoAVS Avell the 
structure of the stereom, the inner layer (fig. 8) having been 
partly removed. 
All the plates so far found are of the smooth type, but it is 
fpiite possible that furthei' collecting Avill bring to light strongly 
ribbed plates, such as are found associated Avith the smooth type 
in the English chalk. In themselves, these plates are insufficient 
to throAV any light on the (juestion as to Avhether there is more than 
one species of Marsupites. On the other hand, they do not show 
any differences that are not covered by the range of variation in 
specimens of M. testudinarius from the English chalk. The Austra- 
lian plates are therefore here referred to the same sjiecies. 
Works Peferred to. 
Bather, F. A., 1889. Note on Marsupites testudinarius v. Bcldotheim, 
sp. Quart. Journ. Geol. Soc. London, XLV, pp. 172-174. 
Clark, A. H., 1911. The Systematic Position of the Crinoid Genus 
Marsupites. Proc. IT.S. Nat. i\Ius., XL, ])p. 649, 654. 
Clark, W. B., and Twitchell, W. M., 1915. The Mesozoic and Ceno- 
zoic Echinodermata of the United States, ilonogr. U.S. Geol. 
Surv., LTV, ])p. 1-841, pis. i-cviii. 
Filliozat, M., 1906. Sur la presence, de placpies de Marsupites dans 
la Craie de Touraine. Bull. Soc. geol. France (4), VI, ])]>. 2. >9. 
1908. La Zone a Marsupites dans la craie de Vendome. Bull. 
Soc. arch sci. et litt. Vendomois, XLVII, ]>p. 255-257. 
— . . - 1910. La Craie de Blois et le niveau a Uintaerimis. Bull. 
Soc. geol. France (4). X, pp. 728-729. 
Hosius, A., 1860. Beitrage zur Geognosie WestjOialens. Zeits. 
deutsch. geol. Gesell., XII, ];>p. 48-96, pi. ii. 
Janet, C., 1906. Sur la Zone a Marsupites (French Flanders). Ann. 
Soc. geol. Nord XXXV, pp. 244-246. 
Leriche, VT., 1905. La “Zone a Marsupites'’ dans le Nord de la 
France. Ann. Soc. geol. Nord, XXXI V, pp. 50-51. 
Peron, A., 1899. La Zone a Ptaeentieeras uhJie/i et la Zone a Mar- 
supites ornatus dans le Cretaee de I’Algerie. Bull. Soc. geol. 
Prance (3), XXVI, pp. 500-511, fig. 
