Crinoidea. 4(11 



III Br series ; the arms are slightly smaller than the normal, eleven in 

 number. 



4. A normal ray bearing nine arms; all the IIIBr series are developed, 

 and there is one IV Br series on the inner side of the right IIIBr series. 



5. This ray is slightly ventral to the preceding; it bears 10 arms, 

 four on the right and six on the left branch, the extra axillaries on the 

 latter being external. 



6. This ray resembles the preceding; it bears nine arms, four on the 

 right branch and five on the left; the extra axillary on the latter is on the 

 side nearest the left branch, i. e., external. 



7. The radial bears four II Br ossicles arranged in two synarthrial 

 pairs ; there is one further division, two II Br series being present, giving 

 a total of four arms. This I Br 4 series is the only division series on the 

 animal not 2. 



The disk shows two anal areas and two anal tubes, the right being 

 slightly the larger; six of the converging ainbulacral furrows are similar 

 and approximately equal, but the post-radial series displaced ventrally is 

 supplied by an ambulacral groove practically equal to two of the others, 

 which divides immediately on leaving the peristome, so that apparently 

 eight ambulacral furrows converge at the mouth. 



On some arms P t is very nearly or quite as stout basally as P 2 , 

 though it tapers more rapidly. The lower pinnules are all badly broken. 



The cirri are XLV, 27 31, 17 mm to 20 mm long, and slender; the 

 longest proximal segments are slightly "dice-box shaped" ; the shorter 

 outer segments have rounded dorsal spines which become more pointed 

 terminally. 



In general this specimen agrees well with others at hand from the 

 Marshall Islands. 



Fam. Thalassometridae A. H. Clark. 



Grenus Ptilometra A. H. Clark. 

 Ptilometra macronema (J. Mtiller). 



Literature: See "The recent Crinoids of Australia". 



Localities: Stat. 56, Koombana Bay, 6 7 miles southwest of 

 Bunbury; 14V-2 18 meters; rocky bottom, with a few plant-like orga- 

 nisms; 28. VII. (3 very young specimens). ? Vicinity of Perth 

 (6 specimens). 



