The Crixoiiis from Dr. S. Hock's Expedttiox to Japan 1014. 33 



height of the segments = ' 2 — ' 3 X bi-. 13 — 14 segments pr cm. (11. 

 if the syzygial pairs are counted as uni(s). The breadth of the arms 

 ]ii'o.\imally 3 — 3,^ mm. In the middle arm-parts 2 mm. 



P„V40 (C-8T) 14—17 mm., \\y 32 (5-6 T) 10 mm., l\ and 

 1*.^ decreasing. P.j about 20 (5 T) 5 mm. This, however, not always 

 so decided, but l\, or P., are most often the shortest. In the posterior 

 arms the pinnules are genitally swollen after Pjv. Combs to Pg,, — P25, 

 most often on every two p., here and there even to Pj^,. The basal 

 segments of the pinnules distally somewhat bent outwards and bor- 

 dered with spines. Genital p. 7 mm. Distal p. 20 — 25; 9 mm. Dorsal 

 hooks on the last 9 — 12 segments. 



Disk smooth, without calcareous granules or papillae, 25 mm. 

 Anal funnel central, short, verruciform, L = 4 mm. Colour yellow- 

 brown. Cirri whitish with brown transverse bands. 



In the pinnules and arms an ento-parasitic new myzostomid, 

 compai'e Protomyzosiomum. 



Sp. 2 (St. 45) The free dorsal surface of Cd 4 mm. C. XXVII 

 23—25 (D) 25—27 (V), 25—30 mm. in 2 whorls. 



K — s appearing in the corners. I Br 1 h = ' 4 X bi-, united by 

 synarthry with I Brax. Laterally of half their height fused with each 

 other. Disk somewhat more visible in the interspace between the 

 arms than in the preceding specimen. I Brax flattened pentagonal, 

 h = -;3 X br. Priniipostaxillaries united inside for the most part. II 

 Br:s are 4 (3+4) 9 cases, III Br:s : 2, 13 cases, IV Br:s : 4, 3 cases. 

 Synarthrial tubercle between II and III Br 1 — 2. Arms XXXV + (pro- 

 bably XXXIX in the complete specimen) 125 mm. Arm-bases in this 

 and the following specimen smoother than in the preceding one. The 

 breadth of the arms proximally 2,2 mm., in the middle of the arm 

 1.7 nnn. 



P„ + 40 (7 T» 10 nun. P,,- + 38 (7 T) 15 mm., P, ± 25 (() T) 5 mm. 

 1*2 IS; 3 mm. Then longer p. again; combs here and there at least 

 to Pgr, . Distal p. 18; 7 mm. 



Disk 18 mm. Anal iuterradius large, swollen, with calcareous 

 papilloe. Colour grey-yellow. 



Sp. 3 (St. 45) C. XX 19-20 (D), 26-27 (V), 12-25 mm. II 

 Br:s are 4 (9 eases), III Br:s : 2, IV Br:s : 2, V Br:s : 2 (1 case). Arms 

 MA II 105 mm. 



Suva Acta Keg. Sop. Sc. Ups.. Ser. 1, Vol. r,. X:o (i. Iniiiv. ■"' s 1922. 5 



