PART 5 A MONOGRAPH OF THE EXISTING CRIXOIDS 485 



Geographical range. — Southwestern Japan, from the Goto Islands to the vicinity 

 of Kobe. 



Bathymetrical range. — From 254 (?188) to 349 meters; the average of 4 records is 

 269 meters. 



Thermal range.— Fvom 9.67° C. to 13.33° C; the average of 3 records is 11.53° C. 



Remarks. — This species was described under no less than 3 different names in 

 1907, and in addition had a fourth bestowed upon it to replace the first, which was 

 found to be preoccupied. In 1908 the identity of all these supposed species was 

 discovered, and in a list of the crinoids of Japan the name bowersi was used as including 

 minor, orientalis and minckerti, although that fact was not specifically stated. 



NANOMETRA JOHNSTONI John 



Nanomelra johnsloni John, Rep. B.A.N.Z. Antarctic Res. Exped. 1929-31, ser. B, vol. 4, pt. 6, 1939, 

 pp. 193-196 (stas. 113 and 115; description; range of the genus); fig. 1, p. 193. — H. L. Clare, 

 Echinoderm fauna of Australia, 1946, p. 61 (notes). 



Diagnostic features. — The centrodorsal is rounded conical with a domed dorsal pole; 

 the cirri are XX-XL, with up to 35 segments; P, has 10 to 12 segments, which are 

 markedly spinous at their distal ends; the distal borders of the radials and of the IBr 

 series are everted and more or less tubercular or spinous. 



Description. — The centrodorsal is large. Its length is nearly equal to its basal 

 diameter. The sides of the proximal two-thirds, which bear the cirrus sockets, are 

 rounded; the distal third, formed of the dorsal pole, is like a separate smaller dome 

 superimposed on the truncated apex of the centrodorsal itself; it is closely beset wnth 

 tubercles and very rough. The ventral edge of the centrodorsal is produced into low 

 interradial corners. The cirrus sockets are arranged in closelj'' placed, slightly irreg- 

 ular columns, three columns to each radius; two, or more usually, three sockets to 

 each cohmm; the sockets of adjacent columns alternate with one another. 



The cirri are about XL, 24-35, up to 10 mm. long. The apical are much shorter and 

 slighter than the peripheral. The longer cirri have the first two segments shorter than 

 broad, the second longer than the first. The third to about the fourteenth are longer 

 than broad. The third is one and a half times as long as broad; the fourth and fifth are 

 twice, the sixth and seventh nearly t\vice, as long as broad and the following ones are 

 progressively shorter. From about the fifteenth, the segments are broader than long. 

 The dorsal and ventral edges of the third segment are moderately concave; those 

 of the fourth are shghtly so. The distal ends of the fifth to twelfth segments are a 

 little wider than the proximal. Beyond the twelfth segment a strong dorsal keel, 

 occupying almost the whole dorsal edge and having a rounded outline, is developed, 

 so that the distal end of these segments is considerably vnAcv than the pro.xiu^al. The 

 keel is lower on the three to four segments before the penultimate. The opposing 

 spine is hj^aline, triangidar and very strong and stands out at right angles from the 

 penultimate segment. The terminal claw is short and curved. 



The radial is short, about seven tunes as broad as long, with a concave distal 

 edge. The middle point of the distal edge of some radials, but not of all, is raised into 

 a strong high tubercle. 



The IBrj is two-fifths as long as broad. The proximal edge is straight and slightly 

 wider than the distal, which is also nearly straight, since it is not deeply incised by the 

 axillary. Strong tubercles arise from the surface, of wliich there are two on each side 



