A MONOGRAPH OF THE EXISTING CBINOID8 613 



One of the specimens presumably from the vicinity of Perth has 41 arms about 

 90 mm. long. Two of the IIIBr series are 2, but all the other division series beyond 

 the IBr series are 4 (3 + 4). The centrodorsal is very thin and is in-egular in shape. 

 There are XI fully grown and 2 small cirri which are rather irregularly spaced. The 

 fully grown cirri are 7 mm. long and are composed of 13 segments; they appear 

 rather small and weak. Pd is 21 mm. long. The color, including that of the cirri 

 and the dorsal pole of the centrodorsal, is purplish gray, thickly covered with uniform 

 small rounded whitish spots, the outer half of the arms becoming rather suddenly 

 lighter and being unspotted. 



A second specimen has 33 arms about 60 mm. long. Five of the IIIBr series 

 are 2, all the other division series beyond the IBr series being 4 (3 + 4). The centro- 

 dorsal is almost completely reduced to the stellate form and bears VII cirri, all but 

 one of which are interradial in position. The color is a uniform purplish black. 



A third specimen is in general similar to the preceding. There are 31 arms 

 about 45 mm. long. The centrodorsal bears V cirri, arranged in one pair and one 

 trio, all on the same semicircumference of the centrodorsal. The cirri are 6 mm. 

 long and are composed of 13 segments. The color is a uniform purplish black, but 

 there is a large yellow spot in the center of the centrodorsal. 



The fourth specimen is smaller and of a uniform purplish black color, like the 

 2 preceding. 



Of the 9 specimens from the Hamburg southwest Australia expedition station 23 

 one large individual has 61 arms 120 mm. long and the cirri VI, 8.5 mm. long, confined 

 to the anterior semicircumference of the centrodorsal. All the division series beyond 

 the IBr series are 4 (3+4). The color is dark brown, the division series and arm 

 bases with uniformly distributed small equal-sized light-green spots. 



A second specimen has 37 arms 120 mm. long and IV cirri 9 mm. long. All the 

 division series beyond the IBr series are 4 (3 + 4). The color is the same as that of the 

 preceding. 



A third specimen has 34 arms 105 mm. long and the cirri IV, 8 mm. long. It is 

 colored like the preceding. 



A fourth specimen has 41 arms 75 mm. long. The cirri are VIII, 14.9 mm. long. 

 There are 3 IIBr series. The coloration is as in those preceding. 



A fifth specimen has 26 arms, of which the anterior are 85 mm. long and the 

 posterior are 40 mm. long. The cirri are II, 6 mm. long. Six of the IIBr series arc 2, 

 the remaining 4 being 4 (3 + 4). The color is plain dark brown. The remaining 

 4 specimens are small. 



The specimen from the Hamburg southwest Australian expedition station 26 

 has 24 arms 105 mm. long. Of the IIBr series, 7 are 2 and 3 are 4 (3 + 4). Of the 

 4 IIIBr series present, 2 are 2 and 2 are 4 (3 + 4). The 2 IIIBr 2 series are single, 

 both internal, and both developed on IIBr 4 (3 + 4) .series. The 2 IIIBr 4 (3 + 4) 

 series are on a smgle IIBr 2 series. The centrodorsal is approximately circular, 3 

 mm. in diameter, and flat, except for a shallow pit in the center. There are VI fully 

 grown cirri and 4 rudimentary cirri of various lengths. The fully grown cirri are 6 

 mm. long with 13-14 segments. The color is dark brown. 



The specimen from Challenger station 186 was described by Carpenter as a new 

 species under the name of Actinometra valida. 



