41 y AUSTIN HOBART CLARK, 



Further Distribution. Dirk Ha r tog Island; King George 

 Sound; ''southern Australia"; Port Phillip; Kangaroo Is- 

 land. 



Depth. Sublittoral; from about 12y 2 to about 50 meters. 



Notes. The largest specimen presumably from the vicinity of Perth 

 has nineteen arms; the cirri are XXXV, 89 106, the longest 65 mm long; 

 the dorsal pole of the centrodorsal is very slightly concave, 6 mm in 

 diameter: the centrodorsal as a whole is thick-discoidal or columnar; the 

 cirri are stout basally, but taper in the proximal third becoming slender 

 in the outer half; the first segment is short, the following gradually in- 

 creasing in length and becoming nearly or quite as long as broad on the 

 tenth or eleventh, remaining of the same proportions to nearly the end 

 of the proximal half of the cirrus, then gradually decreasing so that the 

 segments of the distal third are about twice as broad as long; with the 

 shortening of the segments distally the distal dorsal edge begins to become 

 produced, this production on the short distal segments forming a high 

 narrow carination or blunt dorsal spine. The colour is light purple, the 

 cirri slightly darker, and becoming very dark distally. 



Another specimen has also nineteen arms 60 mm long; the cirri as in 

 the other are arranged in fifteen closely crowded columns, two or three to 

 a column ; they reach a length of 55 mm or 60 mm, and the longest have 

 from 81 to 89 segments. 



A third specimen has twenty arms, the cirri with a maximum of 

 75 segments; the other specimens have nineteen arms each; one of them 

 has a single III Br series developed externally. 



In the smaller specimens the longest cirrus segments are slightly 

 longer than broad. 



The little specimens from Koombana Bay have given me considerable 

 trouble; they appear to be exactly comparable to the Antedon Wilsoni 

 described by BELL, and to the Himerometra paedopliora described by H. 

 L. CLARK, both of which proved subsequently to be but the young of 

 species of Ptilomelra, the former of Pt. macronema and the latter of Pt. 

 Mulleri. 



The largest of these individuals has cirri XVII, 41 44, 15 mm to 

 20 mm long, arranged in ten closely crowded columns of two each ; the 

 cirri are stout basally, but taper very evenly and gradually, becoming very 

 slender at the tip where their dorsoventral diameter is not quite half 

 of what it is at the base ; the first segment is short, the following 

 gradually increasing in length and becoming about as long- as broad 



