A MONOGRAPH OF THE EXISTING CRINOIDS 255 



A. H. CLARK, Unstalked crinoids of the Siboga Exped., 1918, p. 77, footnote 1 (synonym of 

 crenulata) . 



Amphimetra crenulata A. H. CLARK, Smithsonian Misc. Coll., vol. 60, No. 10, 1912, pp. 2, 16 (identity) ; 

 Die Fauna Sudwest-Australiens, vol. 4, Lief. 6, 1913, p. 314 (correction of previous records); 

 Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 22 (published references to specimens in B. M.; 

 localities; notes); Internat. Revue gesamt. Hydrobiol. und Hydrogr., 1915, pp. 223 ff. (detailed 

 account of distribution in Australia). H. L. CLARK, Biol. Results Fishing Exper. F. I. S. 

 Endeavour, 1909-14, vol. 4, pt. 1, 1916, p. 21 (new locality; notes). GISLEN, Kungl. Svenska 

 Vet.-Akad. Handl., vol. 59, No. 4, 1919, p. 3 (discussion); Zool. Bidrag Uppsala, vol. 9, 1924, 

 p. 39, footnote (disk reaches to IIBr^, p. 44 (reversion), p. 47 (obliquity of joint faces), pp. 77, 

 78 (syzygies), p. 285 (Cape Jaubert, 21 m.; details), fig. 33, p. 52, fig. 69, p. 75. 



Antedon philiberti Brit. Mus., MS. A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 110; Smith- 

 sonian Misc. Coll. vol. 61, No. 15, 1913, p. 22 (northeastern Australia; J. B. Jukes). 



Actinomelra Solaris Brit. Mus., MS. A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, 

 p. 22 (Prince of Wales Channel; 5-7 fathoms). 



Craspedometra aruensis REICHENSPEROER, Abh. Senck. naturf. Ges., vol. 35, Heft 1, 1913, p. 82 (Aru 

 Islands), p. 99 (west of Ngaiguli, 14 meters; detailed description and comparisons), fig. 8, p. 100 

 (lower pinnules). 



Craspedometra anceps REICHENSPERGER, Abh. Senck. naturf. Ges., vol. 35, Heft 1, 1913, p. 82 (Aru 

 Islands), p. 99 (details of the locality; notes; comparisons), fig. 8, p. 100 (lower pinnules). 



Heterometra crenulata A. H. CLARK, Unstalked crinoids of the Siboga-~E\ped., 1918, p. 77 (in key; 

 range), p. 79 (synonymy; notes; stations 273, 274), p. 275 (listed). H. L. CLARK, The echino- 

 derm fauna of Torres Strait, 1921, pp. 5, 6 (history), pp. 21, 192 ff. (distribution). GISLEN, 

 Zool. Bidrag Uppsala, vol. 9, 1924, p. 215 (disk). A. H. CLARK, Journ. Linn. Soc. (Zool.), 

 vol. 36, 1929, p. 638 (Baudin Island; 8-15 fathoms); Treubia, vol. 14, livr. 2, 1933, p. 212 

 (localities; notes). GISLEN, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, 

 pp. 22, 27; Kungl. Fysiogr. Sallsk. Lund Forh., vol. 7, No. 1, 1936, p. 4 (French Indochina), 

 p. 6 (range), p. 9 (localities; notes). H. L. CLARK, Mem. Mus. Comp. Zool., vol. 55, 1938, p. 33 

 (Roebuck Bay, 5-8 fathoms; Broome; Norwest Islet, Capricorn group; notes). 



Heterometra variipinna GISLEN, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, pp. 7, 

 16, 27. 



Diagnostic features. This very variable species is easily recognized by the 

 tnlarged lower pinnules, which are very strongly prismatic, the outer portion of the 

 prismatic ridges on each segment being raised into conspicuous broad rounded 

 eriangular processes so that the profiles of the pinnules are very strongly serrate, 

 the teeth of the serration having broadly rounded ends. 



The animal is usually (though not always) stout and robust, with the dorsal 

 surface of the elements of the division series and of the brachials swollen and with 

 well-developed broadly rounded synarthrial and articular tubercles. The enlarged 

 lower pinnules are usually (but not always) much stiffened and sometimes spinelike. 



Notes. The specimen from Albatross station 5481 is small with 12 arms. 



The specimen from Albatross station 5358 has 11 arms 150 mm. long. The cirri 

 are XI, 34-41, from 35 to 37 mm. long, rather more slender than usual. The processes 

 on the segments of the proximal pinnules are less developed than is usually the case, 

 and the general appearance of the animal is less rugged than in typical examples. 

 The individual probably is not quite mature. 



The two specimens from Albatross station 5157 upon which Craspedometra aliena 

 was based proved to be unusually slender and poorly developed examples of crenulata. 

 The centrodorsal is thick discoidal with the bare polar area flat, 2-4 mm. in diameter. 

 The cirrus sockets are arranged in a single or partially double alternating marginal row. 



