The Crinoids feom Dk. &. Bock's Expedition to Japan 1014. 147 



It seems to me as if Th. cijpris were rather indistinctly sepa- 

 rated from the above-described species. 



The dorsal prominences of the eirrals are not developed in the 

 above specimens. Is this condition, perhaps, common to all small spe- 

 cies of the genus Thaumatomctra't If P.^ may have a genital gland in 

 Antedo7iinœ, and the dorsal prominences of the cii'rals may be absent 

 in Bathymetrinœ the limit between the two sub-families becomes rather 

 vague. 



Pentacrinidae (d'Okbigny). 



Metacriuus P. II. Carpenter (Wyv. Thoms. M. tS.j. 



M. nobilis var tenuis n. var. 



Fig. 161, 162. 



From St 7 (2), 9 (5), 56 (1), 58 (1) = 9 specimens. Also a stem- 

 less crown without indication of the locality. 



Sp. 1 (St. 9) Full-grown internodes with 10 — 13 internodal joints, 

 13 — 18,5 mm. (8, 9 and 10 internodals each 1 case, 11:5 cases, 12 : 5 

 cases, 13:4 cases). Interarticular pores to the 12* internode. The 3 

 most proximal nodals without cirri. Full number of internodal joints 

 in the 6"' internode. The stem with 22 internodes; total length 275 

 mm. Diameter of the stem 3,5 — 4,5 mm. The segments are pentago- 

 nal, smooth; the 10 most distal internodes, however, with the joints 

 in the radial line a little concave and provided with small tubercles. 

 Here and there on the internodals tubercles also IR. 



Cirri reaching over 2 — 2 '/2 internodes. 50 segments (IX"' nodal) 

 44 mm., 44 (XIII) 36 mm., 44 (XVI) 36 mm., 40 (XVII) 31 mm., 40 

 (XVIII) 30 mm. 7*'' segment L=^br; 15 last segments with dorsal 

 spines. L of the terminal claw = l'/2 times the preceding segment. 



151) Cirrus »/i, 152) Br 2 and 3 with P, '"/i; 1.53-156 Thnumatometra comaster (St. 37), 

 153) Cirrus °/i, 154) Pj 'Vi, 155) Pj with a genital gland 'Vi, 156) An arm-stump with distal 

 pinnules (a small genital gland from the Bd-the 5th segments) Vi ; 157, 158 Metacrinus inter- 

 riiptus (Sp. 10) 157) P, (I Br 8) viewed somewhat more laterally than in the two following spe- 

 cies, X 4 '/2, 158) Cirrus a) Proximal part b) Distal part, X 4 ',2; 159, 160 Metacrinus rotundus 

 (Sp. 2) 159) P,, X 4 ',2. 160) Cirrus a) Proximal b) Distal part, X 4 '/2; 161, 162 Metacrinus no- 

 bilis tenuis (Sp. 1) 16i) Pj, X 4 '/2, 162) Cirrus a) Proximal part (observe: by the position of the 

 basal eirrals tlie cirrus is bent downwards, not, as in the two preceding species, upwards) b) Di- 

 stal part, X 4 '/s. 



