PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 161 



ference warrants a subspecific distinction for those nortliwest Australian specimens for 

 whicli I propose the name austini. A. incommoda has previously been recorded from 

 as far north as Geraldton in Western AustraUa but I have seen no specimens other than 

 those from Port Phillip, so cannot define the range of this new subspecies. 



An interesting discovery made while measuring the centrodorsals of idl the Port 

 Phillip specimens, was that among those registered in the 1890s, some of which speci- 

 mens had been through P. H. Carpenter's hands, were six examples of Antedon loveni. 

 These were all smaller than the majority of the specimens of incommoda taken with 

 them. They were distinguished at first by the convex centrodorsal and by the more 

 slender cirri. An examination of the pinnules showed Pj to be much shorter than in 

 incommoda with only about 8 segments. Carpenter was therefore justified in thinking 

 there are two related species in Port Phillip Bay. 



As Antedon loveni and A. incommoda do occur together at Port Phillip it is not so 

 unlikely that both can be found at Port Jackson. 



Localities.—FoTt Jackson, New South Wales [A.H. Clark, 1910, 1911] (5, U.S.N.M. 

 356S0; Australian jVI.). Type locality of Compsometra lacertosa. 



Endeavour; southeast of Flinders Island (north of eastern Tasmania); 68 meters 

 [H.L. Clark, 1916] (1, M.C.Z., 718). 



Port Phillip, Victoria, outer part of the harbor and outside the Heads [Bell, 1888; 

 P. H. Carpenter, 1890; A. H. Clark, 1911, 1913] (43, B.M.). Tj-pe locahty. 



Encounter Bay, off the mouth of the Murray River, South Australia [A. H. Clark, 

 1911]. 



Hamburg Southwest Australian Expedition, 1905, station 56; Koombana Bay, 6-7 

 miles southwest of Bunbury, Western AustraUa; 14.5-18 meters; rocky bottom with 

 a few plantlike organisms; July 28, 1905 [A. H. Clark, 1911, 1912; Hartmeyer, 1916] 

 (3, U.S.N.M., 35675; Berl. AI.; H.M.). 



Western Australia: Geraldton; tide pool N. of jetty. Dongarra. Cottesloe, North 

 Beach. Off Garden Island, Fremantle; 13 meters. Bunbury, Koombana Bay; 9-15 

 meters; Basalt Reef. East of C. Naturaliste, Bunkers Bay. Albany; below low water 

 [H. L. Clark, 1938]. 



Geographical range oj Antedon incommoda. — South and west coasts of Australia 

 from Port PhUlip, Victoria, and probably Port Jackson, New South Wales, to the 

 Dampier Archipelago in the northwest (subspecies austini). 



Bathymetrical range. — From shallow water down to 68 meters. 



History. — Prof. F. Jeffrey Bell in 1888 published a report upon a nmnber of echino- 

 derms which had from time to time been sent to the British Museum by Mr. J. Brace- 

 bridge Wilson, who had been conducting dredging operations at Port Phillip, Victoria. 

 In this collection were two comatulids taken in the summer of 1887-88 in the outer part 

 of the harbor of Port PhiUip and outside the Heads; these Professor Bell took to rep- 

 resent a new species which he described under the name of Antedon incommoda, re- 

 marking that it appeared to be common at Port Phillip, as several specimens had been 

 sent to him. In his description, brief and unsatisfactory, be compares his new species 

 only with Antedon [Oligometrides] hidens. 



In the following year Professor Bell published a short note in which he mentioned 

 that in the Alert report he had stated that P2 in Antedon jmmila (i.e., A. loveni) is longer 

 than Pi whereas as a matter of fact it is Pj that is longer than P2, and that this had 

 led him to institute a new species, A. incommoda, based on examples of what are really 

 A. pumila. 



