PAHT 5 A MONOGRAPH OF THE EXISTIXG CRINOIDS 331 



It may be short and obtuse as in the type or considerably more acute and prolonged. 

 The second brachials tend to be triangular in dorsal view, those of each pair approxi- 

 mating distally and forming a triangular space midradially with the tangential free 

 border of the joined first brachials. 



Localities. — Scotia, April 24, 1904; off Gough Island, South Atlantic; 183 meters 

 [Vaney and John, 1939] (holotype, Roj-al Scottish M. ; paratype, B. M.). Type locality. 



Discovery station 2493; Discovery Bank (lat. 42°03.9' S., long. 00°03.5' E.); 472 

 meters; November 29, 1938 (4, B. M.). 



FLOKOMETRA MAWSONl A. H. Clark* 



Figures 18,c,d,g,h,j; 40, e 



Antedon antarctica (part) Bell, National Antarctic Exped., Nat. Hist., vol. 4, Echinod., 1908, p. 4 

 {Discovery; Winter Quarters). 



Solanometra antarctica (part) A. H. Clark, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. Gl, No. 3 

 (Discovery; Winter Quarters) . 



Protnachocrimis (Promachocrinus) kerguelensis (part) A. H. Clark, Die Crinolden der Antarktis, 

 1915, p. 130, bottom of page, pi. 4, figs, la, 16 (vicinity of Gaussberg, 222 fathoms). 



Florortietra maicsoni A. H. Clark, Sci. Rep. Australasian Antarctic Exped., 1911-14, ser. C, vol. 8, 

 pt. 4, 1937, p. 5 (listed), p. 8 (in key), pp. 10-14 (description; localities; range; notes). — John, 

 Discovery Reports, vol. 18, 1938, p. 123 (listed), pp. 125, 129, p. 132 (in key), pp. 144-148 

 (references; Dtsoower)/ stations; description; distribution), fig. 3, p. 147, pi. 3, fig. 2; Rep. B.A.N.Z. 

 Antarctic Res. Exped. 1929-31, ser. B, vol. 4, pt. 6, 1939, p. 191 (listed), p. 192 (abnormality of 

 one specimen with two arms fused at the first syzygy), pp. 198, 199 (references; F. antarctica a 

 synonym; descriptive remarks). — Vaney and .Iohn, Sci. Res. Voy. Scotia, 1902-04, Crinoidea, 

 1939, p. 667 (comparison with F. goughi). — A. H. Clark, Journ. Washington Acad. Sci., vol. 40, 

 No. 10, 1950, p. 335 (references; locality). 



Florortietra antarctica John, Discovery Reports, vol. 18, 1938, pp. 148-151 (localities; description; 

 comparison with F. mawsoni); fig. 4, p. 149, pi. 3, fig. 3; Rep. B..\.N.Z. Antarctic Res. 

 Exped., ser. B, vol. 4, pt. 6, 1939, p. 198 (synonym of mawsoni). 



Diagnostic jeatures. — A species of Florometra with XL-LXXVII cirri, having up to 

 34 segments of which the longest may be three times as long as broad and the distal ones 

 usually have a very well-marked dorsal spine; the opposing spine is conical and the 

 terminal claw slender and curved; the pro.\imal brachials are more or less strongly 

 spinous and everted towards their distal edges but in some specimens, particularly 

 larger ones, this may be reduced and inconspicuous; the third syzygy is usually at 

 brachials 14 -(-15; Pi has up to 50 segments of which the distal ones are shghtlj' modified 

 to form a rudimentary comb, giving the profile a scalloped appearance; the segments of 

 the middle and distal pinnules are mostly hardly longer than wide. 



[Note by A.M.C] Of the other southern hemisphere species of Florometra, 

 magcllanica diiTcrs from mawsoni in the position of the third syzygy and the larger size, 

 goughi has very reduced dorsal spines on the cirri, which are also more numerous and 

 austini has a better developed comb and more numerous segments in Pi as well as more 

 cirri also with more numerous segments, the dorsal spines again being less prominent 

 than in mawsoni. All these three species are from subantarctic localities. I beUeve 

 that mawsoni is more closclj' related to Solanometra antarctica, from Heard Island — an 

 antarctic locality — as discussed further on pp. 339-340; the short segments of the distal 



*See also Addenda (p. 837) under 1963, 1964. 



