A MONOGRAPH OF THE EXISTING CRINOIDS 105 



postradial series, 4(3+4). This individual agrees with the four from Mermaid Strait, 

 with which it was compared directly. 



The other specimen from Port Denison is considerably smaller, with 29 arms 65 

 mm. long. The IIBr series are 4 (3+4) and the IIIBr series are 2. The cirri are XX, 

 35-39. 



The type specimen from Port Molle was described by Professor Bell as follows: 

 The centrodorsal is small and flattened, and bears two rows of marginal cirri. The 

 cirri are XXV-XXX, 40, 30 mm. long, with the fifth-tenth segments rather longer 

 than broad, and those succeeding with a short conical spine, which diminishes on the 

 more distal ones but enlarges again somewhat as an opposing spine. The radials are 

 just visible. The IBri are wide and are barely in contact laterally. The IBr 2 (axil- 

 laries) are comparatively short. The IIBr series are pretty long, 4(3+4). If the arms 

 divide again the division series are generally 2, but they may be 4(3+4). There are 

 30 delicate arms, which are 95 mm. long. The earlier brachials have parallel proximal 

 and distal edges; the succeeding brachials become wedge-shaped, but the distal edges 

 do not overlap. Still further out the brachials become shorter and project a little 

 at the sides. Toward the free end of the arms the dorsal surface of each brachial is 

 sharply convex. Syzygies occur between brachials 3+4, 12+13, and 24+25 and 

 distally at intervals of 10-14 muscular articulations. The first two pinnules are stiff 

 and long, longer and stouter than the third and fourth. None of the following 

 pinnules^ are long, but the rather more distal are the longer. The disk is deeply 

 incised, and the margins of the rays are provided with a well-developed and character- 

 istic calcareous plating. Owing to the incisions the disk is only 8 mm. in diameter. 

 The arms are pinkish flesh-color dorsally, much darker ventrally. The cirri are ringed 

 with purplish and white. In a younger specimen there are purplish spots on the arms 



dorsally. . . 



Bell expressly remarked that none of the endocyclic comatulids he described in 

 his report on the Alert collection had the elements of the IBr series united by syzygy, 

 and so when Carpenter first made a cursory examination of most of the comatulids 

 dredged by the Alert he failed to detect the similarity between the three specimens 

 upon which Bell based his Antedon elegans and the four Challenger specimens upon 

 which his own Antedon flucluans was based. He did, however, recognize his A. 

 fluctuans in a small mutilated specimen from Torres Strait which had been considered 

 by Bell too imperfect for description with the rest of the Alert collection. 



In connection with the revision of the endocyclic comatulids with a synarthry 

 between the elements of the IBr series and the IIBr series 4(3+4) Carpenter later 

 reexamined the three specimens of Antedon elegans from Port Molle. He found that 

 in all three the elements of the IBr series are united by syzygy. 



The original description (18S2) of Antedon elegans was simply a so-called specific 

 formula in which it was indicated that the IIBr and IIIBr series are of three elements— 

 that is, 4(3+4). This was later revised by Bell as given above. 



Carpenter's reexamination of the type specimens of Bell's Antedon elegans con- 

 vinced him that it is in reality the same thing as his own Antedon fluctuans. 



Carpenter remarked that of the three specimens obtained by the Alert at Port 

 Molle one is very considerably different from the other two, both in color and in the 



208244—40 8 



