NO. 15 RECENT CRINOTDS IN BRITISH MUSEUM CLARK 6l 



8. Mts. Erebus and Terror. — Seven specimens. 



Remarks. — This species is a true Promachocrinus in spite of the 

 strong carination of the arms and the comparative slenderness of the 

 cirri ; both of these characters are seen, feebly developed, in the 

 young of the other species of the genus as well as in the young of 

 Heliometra glacialis. The longest cirri are about 55 mm. long and 

 are composed of about 50 segments ; the arms are strongly carinate 

 from about the fourth brachial outward. 



Subgenus SOLANOMETRA A. H. Clark 

 SOLANOMETRA ANTARCTICA (P. H. Carpenter) 



Antedon antarctica 1888. P. H. Carpenter, " Challenger " Report, Comatu- 

 lse, p. 144 (1). — 1908. Bell, National Antarctic Expedition, Natural 

 History, vol. 4, Echinod., p. 4 (3). 



Antedon australis 1888. P. H. Carpenter, " Challenger " Report, Comatulse, 

 p. 146 (2). 



Antedon adriani 1908. Bell, National Antarctic Expedition, Natural His- 

 tory, vol. 4, Echinod., p. 4 (4). 



1. " Challenger " Station A T o. 151. — Three specimens. 



2. " Challenger " Station No. 150. — Two specimens. 



3. Winter Quarters; "Discovery." — Several specimens; these are 

 probably antarctica, but their small size renders accurate determi- 

 nation difficult. 



4. Mts. Erebus and Terror; " Discovery." — Two specimens. 

 Remarks. — The short cirri with comparatively few segments and 



the extraordinary roughness of the arms and pinnules, combined 

 with the shortness of their component segments, distinguish this 

 species from all the others of the genus. 



I cannot find a single valid character whereby the specimens upon 

 which is based Carpenter's name australis may be specifically differ- 

 entiated from those which he called antarctica; they have the same 

 extraordinary roughness of the arms and pinnules and the same short 

 cirri composed of short segments, and are undoubtedly merely small 

 and somewhat immature specimens. The character relied upon by 

 Carpenter in separating the two forms is the same as that which he 

 invoked to separate Heliometra quadrata from H. glacialis; qitad- 

 rata has since been shown to be but the young of glacialis, and simi- 

 larly australis now proves to be but the immature of antarctica. 



In my paper on the crinoids of the Paris Museum (Bull, du 

 Museum d'hist. nat., 191 1, No. 4, p. 258), I wrote, under the head- 

 ing of Heliometra magellanica, " Cette espece est la raerae que 1' Ante- 

 don australis et aussi que Y Antedon rhomboidca decrite par Carpen- 



