or cups. The length of the larger example extends to only 

 H in., and the other is a trifle smaller. There are 

 the remains of five arms in each specimen, consisting of 

 the lower portions, and the longest fragment shows twelve 

 brachial plates, or ossicles. The arms are three-tenths of an 

 inch in diameter, uniserial, and nearly circular in transverse 

 section. There is no bifurcation present, as the arm-fragments 

 are too short to show forking. The several features of the 

 specimens from Stuart Range, so far as shown, are in all 

 respects similar to those of Isocrinus austral is, and I have 

 no doubt that they belong to that species. 



Isocrinus parvus, n. sp. 

 PL i., fig. 3. 



In 1909 Mr. A. S. Giles forwarded to the Adelaide 

 Museum a small piece of limestone, of Cretaceous Age, con- 

 taining crinoidal remains, and stated that the specimen had 

 been obtained from a locality 20 miles north of Macumba 

 Creek. The specimen was courteously placed in my hands 

 for examination. The fragmentary condition of the remains 

 did not offer much encouragement in the way of description, 

 so that the specimen has remained undescribed until the 

 present. The discovery of two additional examples of 

 Isocrinus australis, described above, made it desirable that, 

 in recording their occurrence, some notice should be taken, 

 at the same time, of the examples obtained near Macumba 

 Creek. 



The crinoidal remains obtained from the last-named 

 locality are included in a piece of shelly limestone, of flattened 

 shape, 2 J in. in diameter; the fossils, which are of a frag- 

 mentary character, are exposed on both the flat faces, as 

 well as the edges, of the stone. The remains are limited to 

 brachia and pinnules, affording only scanty data for specific 

 determination; but the rarity of fossils of this type in 

 the Cretaceous beds of Australia and its manifest distinction 

 from the hitherto only known Australian species of this age, 

 may be assigned as sufficient reasons for the present restricted 

 and imperfect diagnosis. 



Def. — Stalk and cup unknown. Arms bifurcate equally 

 (isotomous) . Brachial plates, uniserial ; rectangular in vertical 

 figure and suboval in transverse outline; destitute of striae; 

 with ambulacral grove on ventral side; minutely perforated, 

 centrally. Pinnules numerous. Distinguished from /. aus- 

 tralis by its greatly inferior size. 



As previously stated, the remains are restricted to 

 brachia and pinnules. These are represented by 21 frag- 

 ments, probably representing more than one individual, 



