A MONOGRAPH OF THE EXISTING CRINOIDS 583 



The 4 specimens in the Museum of Comparative Zoology from Port Jackson 

 show the following characters. In one the centrodorsal is small, with the cirri 

 XXXVII, 13-16. The 21 arms are 60 mm. long, with the hrachials short triangular 

 and strongly overlapping. All the division series are 4 (3+4). The distal pinnule 

 segments have strong recurved hooklike spines. This individual is sexually mature 

 and car lies eggs. In a second specimen the cirri are about XXX, 20, and are arranged 

 in 2 irregular rows on the centrodorsal; as in the preceding the distal cirrus segments 

 bear small dorsal spines. The 22 arms are 65 mm. long, with short triangular and 

 strongly overlapping brachials. As in the preceding, P D is slender and not carinate. 

 The pinnules bear eggs. The third specimen resembles the other 2 and is the size 

 of the first. There are 15-17 cirrus segments and 22 arms. The pinnules bear eggs. 

 The fourth specimen resembles the other 3, but bears no eggs. There are 17 cirrus 

 segments and 20 arms 80 mm. long. In all the specimens the IBr 2 and the IIBr series 

 are separated. The color is yellowish brown. 



The 8 specimens collected by Dr. Th. Mortensen at Port Jackson present the 

 following characters: One has 30 arms 80 mm. long. All 10 IIBr series and 10 IIIBr 

 series are present, and all are 4 (3 + 4). The centrodorsal is 3.5 mm. in diameter and 

 has a rather broad depressed center with shallow grooves radiating out to between the 

 cirrus bases. The cirri are XXXIV, 15-17, 9 mm. long. One has 22 arms, of which 

 the anterior are 115 mm. long. All the IIBr series are present, and there are 2 IIIBr 

 series, both external. All the division series are 4 (3 + 4). The centrodorsal is 4 mm. 

 in diameter, with a narrow raised rim, a depressed central area 1 mm. in diameter, 

 and a narrow raised line radiating from the central pit to the base of each cirrus. The 

 cirri are about XLV, 17-18, 13 mm. long, with the distal portion strongly recurved. 

 The division series and arm bases have a narrow faint dark median line. One speci- 

 men has 24 arms 110 mm. long; all the IIBr series and 4 IIIBr series are present, and 

 all the division series are 4 (3 + 4). The cirri are XXV, 16-18. The disk is 20 mm. 

 in diameter. Another specimen has 24 arms 110 mm. long, with 10 IIBr series and 4 

 IIIBr series, all 4 (3 + 4). The cirri have 16-17 segments. One specimen has 27 

 arms 110 mm. long. There are 17-19 cirrus segments. A specimen with 23 arms 

 has all the division series 4 (3+4) and the cirri XL, 16-17. A specimen with 22 arms 

 has 10 IIBr series and 2 IIIBr series, all 4 (3 + 4). A specimen with 20 arms has 

 10 IIBr 4 (3 + 4) series. 



The type specimen from King Georges Sound is small, but quite typical of the 

 species as now understood. As described by Muller, it has 20 arms. The centro- 

 dorsal is relatively large, with the broad dorsal pole slightly concave. The cirri 

 are arranged in a single marginal row. The cirri arc XXX, 15; they are remark- 

 able for their slenderness and for the form of the segments, which are much compressed 

 laterally and of which only the last bears a tubercle. The first pinnules are large. 



The larger of the 2 specimens from Koombana Bay has 20 arms 70 mm. long. 

 The dorsal pole of the centrodorsal is flat, 3.5 mm. in diameter. The cirri are XXV, 

 16-19 (usually nearer the latter), from 11 to 13 mm. long. The smaller specimen has 

 also 20 arms. 



A specimen without locality in the Australian Museum is an usually fine example, 

 with 25 arms 130 mm. long. 



