92 T. GisLKx. 



were broughl home Ity the Buekian expedition. Xe\ertlieless 1 cannot 

 consider that a form that only differs in a characteristic of such a low 

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

 Besides one must bear in mind that Tr. macrodmcns 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 territoiy. 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. inacrocUsais certainly cannot be given more than the value of 

 those of a variety. 



Tropiometra encrinus (Lijtkem). 



Fig. 70, 71. 



For (he ohier syiioiiyiny see 1912 A. H. Clahk din. Iiul. Oc. p. 177 pro 

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



Tropiometra encrinus 1911 A. H. Clark Austral. Mus. Mem. Vol. 4, part L"), 

 1.. 7S0; (?) Fauna Sud-West Austr. Bd 3, Lief. j:j, p. 440; 1912 Rec. Ind. Mus. 

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

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

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

 p. 131. 



From St. 45: 1 specimen. 



•S/). / Cil tlattened, 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 = V2 — 

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

 distinct prominence. Terminal claw L=l'2Xthe preceding segment, 

 curved, pointed. 



K — s h = '4 br, broadest in the corners. I Br 1 h = ' :i br. laterally 

 free. Axillai-y triangular h = ' 3 bi-. Arms X. 105 mm. Br I: br 2.7 mm., 

 united inside in pairs to Cs of their height, on the outside twice as 

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

 distally with an intei'val of 5 to 9 oblique articulations. The brachials 

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

 somewiiat serrate protile. The proximal arm-jjarts smooth, a little 



