The Ceinoids from De. S. Bock's Expedition to Japan 1014. 12:} 



ally flanked by an additional side-spine on eacli outer side. (A bifuca- 

 ted opposing spine has been previously noticed only in the genus Epi- 

 nietra fam. Colobometridce). 



D. Bocki II. s]). 



Fig. 79—84-. Photo 10. 

 From St. 56: 1 specimen. 



>S^). 1 (St. 56) Cd pointedly conical, h 3.5 mm., br. 3 mm. 



C. XXVI 10-12 (D) 15-17 (V); 5— 6 or 15-20 mm. respec- 

 tively, in 3 — 4 whorls. The cirri are arranged in 5 radial groups se- 

 parated by interradial interspaces which are almost as broad as the 

 area occupied by the C. In each group 5 — 6 cirri, often forming an 

 almost single row. P^ and 2'' segments short, 3'' cubical, 4"' increasing, 

 5th_7fi L= 12/3 br, 8"'(— 9"') — the antepenultimate segment not much 

 longer than broad. The dorsal surface of the distal cirrals slightly 

 carinated and overlapping. No dorsal spine. Opposing spine in the 

 distal part of the penultimate segment, large, in the middle deeply in- 

 cised and therefore bifurcated, on the lateral sides moreover often a 

 small additional spine. Terminal claw slender, curved, pointed, longer 

 than the preceding segment. 



R— s visible as narrow bands in the corners. I Br 1 h= 'A br, 

 in the basal half laterally grown together, at the middle somewhat 

 narrower because of the synarthrial tubercle from I Brax. I Br 2, 

 pentagonal, h = '/2 br as the preceding ossicle with a slight median 

 carination, the rest of the ossicle rounded dorsally. The II Br-s are 

 2, similar to the I Br-s. Primipostaxillaries in the basal half grown 

 together in pairs. Arms XIX + (probably originally XX), 60 mm., in 4 

 cases broken between I Br 1 and 2 (the synarthrial articulation well 



rus Vi; 101, 102 Pteronietra trichopoda (St. 45) 101 a) The 15 most proximal cirrals, with a 

 ventral spine from the 4th— the 1-ith segments b) The 20 most distal cirrcils "/i. 102J Distal pin- 

 nule '■'/i; 103, 104 Pnissomctra arnnca (St. 7a. Sp. 1) 103) Distal pinnule ".i.' 104) Cirrus "i; 

 105—108 Compsometra serratn (St. 25. Sp. 3) 105) Genital pinnule 'Vi, 106) P.^ (observe the 

 indistinct stripe under the sacculi; a rudimentary genital cord?) "/i. 107) P, '* i, 108) Cirrus '* i; 

 109 — 113 Compsometra pnri'iflora (St. 47) 109) A stump of the arm with a distal pinnule 'Vi, 

 110) The base of an arm from I Br 1— Br 5 "/i, 111) Cirri a) St. 47, b) from the dorsal whorl 

 of a specimen from St. 45; long cirrals ",i, 112) Br 4-8 with Pa and P^ "/i, 113) P, 'Vi; 

 114—116 Toxometra cequipinna (St 4, Sp. I) 114) Cirrus "/i, 115) P, '^ i, 116) Distal pinnule 

 with a small genital gland " i. 



