Clarh — Two New Australian Crinoids. 41 



Tlie type of P. macronema was taken at King George's Haven, in 

 southwest Australia, while all the very numerous specimens I have 

 examined are from the eastern coast, mostly from Port Jackson or Sydney; 

 there is therefore a possibility that the present species will turn out to be 

 the true macronema, in which case the form from Sydney would require 

 a new name and might appropriately be known as Ptilometra miilleri. 



Oligometra studeri sp. nov. 



Type. — Cat. No. 2,9(54 (part), Konigliche Zoologisclies Museum, Berlin. 



Centro-dorsal thin, discoidal, the bare polar area flat; cirrus sockets 

 arranged in a single marginal row. 



Cirri xii, Ki-lS, 7 mm. long; first joint very short, the following grad- 

 ually increasing in length to the sixth or seventh, whicli, with the 

 remainder, is squarish; on the third or fourth a low transverse ridge, 

 subterminal in position, is developed; this gradually moves, in three or 

 four joints, to a median position, at the same time gaining slightly in 

 height; distally this ridge progressively decreases in width, and on the 

 last four joints before the penultimate becomes a low median si)ine. The 

 ridges on all the joints appear as low spines in lateral view. Opposing 

 spine median in iiosition, arising from the entire dorsal surface of the 

 pemiltimate joint, in height equal to al)out half the diameter of that 

 joint, much longer than the short spines on the preceding joints; termi- 

 nal claw rather stout, slightly longer than the penultimate joint, abruptly 

 curved basally, but becoming more nearly straight distally. 



Ends of the basal rays not visible ; radials concealed in the median line, 

 but visible in the angles of the calyx ;,i Brj oblong, short, about four 

 times as broad as long, the lateral edges straight ; i Br 2 (axillary) broadly 

 pentagonal, almost triangular, about twice as ])road as long; synarthrial 

 tubercles slightly developed. 



Arms 10, 45 mm. long; first two brachials wedge-shaped, slightly over 

 twice as broad as the exterior length, the first interiorly united for rather 

 more than the proximal half, diverging at an obtuse angle distally ; third 

 and fourth brachials (syzygial pair) slightly longer interiorly than exteri- 

 orly, about twice as broad as the median length; following three brachials 

 oblong, about three times as broad as long, then becoming obliquely 

 wedge-shaped, and after the twelfth triangular, slightly broader than 

 long, and in the terininal part of the arm wedge-shaped, about as long as 

 broad. After the tenth tiie brachials develop rather prominent and 

 slightly overlapi^ing distal ends, but this character gradually dies away 

 after about the middle of the arms. Syzygies occur between the third and 

 fourth brachials, again l^etween the ninth and tenth, and fourteenth and 

 fifteenth (the former sometimes omitted), and distally at intervals of four 

 to seven (usually five) oblique muscular articulations. 



Pj about 4.5 mm. long, slender, evenly tapering and becoming flagel- 

 late in the distal portion, with about sixteen joints, the first two rather 

 over twice as broad as long, the third nearly as long as broad, the follow- 

 ing gradually increasing in length, being about twice as long as broad 



