448 AUSTIN HOBART CLARK, 



The arms are short, stout and rugged, tapering rapidly and ending quite 

 abruptly as is characteristic of the species. All the arms possess ambulacral 

 grooves; but in the proximal portion of some of the arms single pinnules, 

 or groups of two or sometimes of three, occur without grooves; in the 

 outer part of the arms occasional pinnules are found to be grooveless. 

 There appears to be no regularity in the occurrence of the grooveless 

 pinnules, though the conditions can not be worked out with certainty be- 

 cause of the poor state of preservation of the ambulacra of the specimen. 

 On one arm (the right derivative from the left anterior ray as viewed from 

 the disk) the ambulacral grooves of two succeeding pinnules (on the same 

 side of the arm) arise from the same point on the brachial ambulacral 

 groove. The mouth is submargiual, just to the right of the base of the 

 right derivative from the anterior ray. The centrodorsal is thick-discoidal, 

 with a large flat polar area 4,5 mm in diameter. The cirri are XV, 32, 

 i:> mm long: they taper very noticeably to the eighth segment, but very 

 slightly or not at all from that point onward ; the sixth to the ninth seg- 

 ments are the longest, half again to twice as broad as long; the remaining 

 segments are subequal, all over twice as broad as long. Up to the eighth 

 the cirrus segments are light in colour with a dull unpolished surface, but 

 beyond that point they are deeper in colour and possess a distinct polish ; 

 there is, however, no marked transition segment such as is seen in the 

 similar cirri of certain of the Thalassometridae. The cirrus segments are 

 perfectly smooth without dorsal spines or other projections, but in profile 

 view the dorsal surface of the outer segments is seen to be very convex. 

 In colour this specimen is light pinkish, becoming rose colour on the calyx 

 and arm bases; the cirri are light pinkish proximally, but become rose 

 colour beyond the eighth segment. 



Remarks. In LAMARCK'S original description the habitat of this 

 species is given, with a query, as Atlantic Ocean. Many years later its 

 similarity to other Australian forms came to be noticed, and Australia was 

 suggested as its probable home. None of the expeditions or individual 

 collectors who have visited Australia in recent years have ever succeeded 

 in finding it, so that up to a very few months ago all that was known 

 about it was contained in the descriptions written by LAMARCK and by 

 MULLER, based upon four examples, two badly broken and two very 

 small. 



During a visit to the British Museum in the summer of 1910 I found 

 there a beautiful unrecorded specimen from Port Phillip, Victoria, and the 

 present collection includes specimens from Koombana Bay and (presumably) 

 from the vicinity of Perth. 



It is evident therefore that we have here a species (representing a 



