PART 5 A MONOGRAPH OF THE EXISTING CRENOIDS 19 



B.A.N.Z.A.R.E. station 41; off Enderby Land (lat. 65''48' S., long. 53°16' E.); 

 180-209 meters; at 200 meters, temperatm-e —1.77° C, salinity 34.247oo; January 24, 

 1930 [John, 1939] (1, Australian Mus.). 



B.A.N.Z.A.R.E. station 107; off MacRobertson Land (lat. 66°45' S., long. 62°03' 

 E.); 219 meters; February 16, 1931 [John, 1939] (4, B.M.; 3, Australian Mus.). 



Geographical range. — Kno-\\-n only from off the Antarctic continent and the Graham 

 Land area. 



Bathymetrical range.— From 130 (?93) to 603 (?610) meters. 



History. — This species was described and figured by Dr. D. Dilwyn John in 1938 

 on the basis of 10 specimens dredged by the Discovery Investigations. 



In the following year the same author was able to amplify his description after 

 studAang the additional material obtained by B.A.N.Z.A.R.E. on the other side of the 

 Antarctic continent. 



Family APOROMETRIDAE H. L. Clark 



Aporometridae H. L. Clark, Mem. Mus. Comp. Zool., vol. 55, 193S, p. 41; Eohinoderm fauna of 

 Australia, 1946, p. 23 (in key), p. 58 (limited to south and southwestern Australia). — Gislen, 

 Rep. Swedish Deep Sea Exped., vol. 2, Zool., No. 4, 1951, p. 55 (absent below 100 meters). 



Apoerinidae (lapsus calami) Hym.vn, The invertebrates, vol. 4, Eehinodermata, 1955, p. 95 (includes 

 only Apoerinibs, i.e. Aporomelra). 



Diagnosis. — A family of the superfamdy Notocrinida including 10-armed species 

 of small size, with the arms not more than 30 mm. in length; the three kno\vn species 

 are viviparous with the gonads and marsupia situated on the pinnules at some distance 

 from the arms; the pinmdes are few, not more than 25 on each side of an arm; the ven- 

 tral perisome of the pinnules is without calcareous deposits, or carries a few small 

 spicules; the oral pinnules have all the segments beyond the first longer than broad, 

 most of them much elongated; and the distal portion of the cirri is flattened ventrally. 



Geographical range. — Southern coast of Australia, north to Manning River, New 

 South Wales, and Fremantle, Western Australia. 



Bathymetrical range. — From 9 to 40 meters. 



History. — The new family name Aporometridae was used as a heading over the new 

 genus Aporometra by Dr. H. L. Clark in 193S. Under Aporometra Dr. Clark quoted 

 from a letter from the author in which he agreed to the validity of the proposed new 

 genus Aporometra and the necessity of creating a new family Aporometridae, and sug- 

 gested placing the Aporometridae with the Notocrinidae in the superfamily Notocrinida. 



Genus APOROMETRA H. L. Clark 



Antedon (part) Bell, Ann. Mag. Nat. Hist., ser. 6, vol. 2, 1888, p. 402, and following authors. 



Himerometra (part) H. L. Clark, Mem. Australian Mus., vol. 4, 1909, p. 524. 



Ptilomelra (part) A. H. Clark, Mem. Australian Mus., vol. 4, 1911, pp. 781, 783, 786. 



Aporometra H. L. Clark, Mem. Mus. Comp. Zool., vol. 55, 1938, p. 41 (diagnosis; type species Himero- 

 metra paedophora II. L. Clark); Echinoderm fauna of Australia, 1946, p. 58 (characterized by 

 relatively long and conspicuous cirri; key to species). 



Apocrinus (lapsus calami) Htman, The invertebrates, vol. 4, Eehinodermata, 1955, p. 95 (3 species.) 



A^ote.— The characters and range of this genus are given under the family Aporo- 

 metridae, of which it is the only known representative. 



The genus Aporometra includes three species which are very closely related to 

 each other and possibly should be regarded as local races of the same specific type. 



