92 T. GisLÉN, 



were brought home hy tlie I>oekiaii expedition. Nevertheless I cannot 

 consider tliat a form tiiat only differs in a characteristic of such a Icjw 

 systematic value as this is to be counted as more than a variety. 

 Besides one must bear in mind that Tr. macrodiHcus is only known 

 from Sagami Bay, while Tr. afra is known from the coasts of Africa,. 

 Australia and New Guinea. Therefore it is very probable that transi- 

 tion forms may be brought home from the intervening territory. Com- 

 pare also A. H. Clark's own descriptions of specimens from Sagami 

 (Proc, U. S. Nat. Mus. Vol. 34, p. 315), which are not very different 

 from Tr. afra. Accordingly I am of the opinion that the differences of 

 Tr. macrodisciis certainly cannot be given more than the value of 

 those of a variety. 



Tropiometra encrinus (LCtken). 



Fig. 70, 71. 



For the older synonymy see 19J2 A. H. Clark Crin. Ind. Oe. [). 177 pro 

 parte (only specimens east of India belonging to this species). 



Tropiovietrii encrinus 1911 A. H. C'l.^rk Austral. Mus. Mem. Vol. 4, part 15, 

 ].. 780; (?) Fauna Slid- West Austr. Bd 3, Lief. 13, p. 440; 1912 Rec. Ind. Mus. 

 Vol. 7, p. 270, (?) Smiths. Misc. Coll. Vol. 60: 10, p. 29; 1913 Proc. U. S. Nat. 

 Mus. Vol. 43, p. 402; 1914 A. Reichensperger Crin. Aru u. Kei-Insein, Senckenbg. 

 Vol. 35, p. 106; 1915 A. H. Cl.^rk Monograph pp.; 1918 Siboga Exp. Vol. 42 B, 

 p. 131. 



Fi-om St. 45: 1 specimen. 



Sp. 1 Cd flattened, free dorsal pole 2 mm., with indistinct scars 

 after fallen cirri. — C. XX 25 — 29 (one cirrus regenerated from the 

 11*^ segment), 18 — 24 mm. in two whorls. Cirrals uniform L = V'2 — 

 (distally) ^/s br, antepenultimate segment L = br. Opposing spine an in- 

 distinct prominence. Terminal claw L = P 2 X the preceding segment, 

 curved, pointed. 



R — s h = 1 4 bl-, broadest in the corners. I Br 1 h = ' 3 br, laterally 

 free. Axillary triangular h = \/3 br. Arms X, 105 mm. Br 1: br 2.7 mm., 

 united inside in pairs to V/a of their height, on the outside twice as 

 long like Br 2. Example of syzygies: 3 + 4, 8 + 9 (or 9+10), 16+17, 

 distally with an interval of 5 to 9 oblique articulations. The brachials 

 distally somewhat overlapping, giving the distal parts of the arms a 

 somewhat serrate profile. The proximal arm-parts smooth, a little 



