138 T. GisLifcN, 



and I Br 1 are of somewhat different form, not so much pronounced, 

 however, in the larger specimen. These differences are therefore 

 pi'obably due to the animals' different ages. 



Zenometrinae A. H. Clabk. 



Psathyrometra A. H. Clark. 



Ps. Wireni n. sp. 



Fig. 128—132. Photo 12. 

 From St. 6 : 1 specimen. 



;S);. 1 (St. 6) Cd pointedly conical, h = 2 mm., br = 2,2 mm. 

 The cirrus-sockets in 5 radial groups, separated by narrow, interradial 

 interspaces. Each radial group with 7 — 8 cirri. (The most dorsal 

 cirrus-sockets more or less indistinct or disappeared). In each group 

 there are two rows (with 3 — 4 cirrus-sockets), forming an angle with 

 each other, and between these rows there is an incomplete one with 

 1 — 2 cirri. 



Cirri fallen or broken, marks after XXXIX. A young, complete, 

 fallen cirrus with 18 segments, 10 mm. I''* segment short, 2'' cubical, 

 3^ L=13/4 br, 4*h segment L==2i/2 br, 5* -7"' eirral L = 3— 3i/2br 

 then slowly decreasing; antepenultimate segment L = 2'/4 br; penulti- 

 mate one L = 2 br. Terminal claw almost straight, L — ','2 of the pre- 

 ceding segment (cf. the figure). The first 7 segments of a full-grown 

 cirrus also remaining. These are larger and coarser, but otherwise 

 of about the same proportions as in the young cirrus. (Except the 

 3'' segment, where L— I'/s br). This cirrus has probably been of a 

 L of about 15 mm. 



R — s somewhat visible in the corners. I Uv — s 1 laterally fi-ee, 

 latero-distally a little squeezed together, h - '/4 br. Axillary h =^ ^ 4 br, 

 broader than the preceding ossicle, rhombic, tlie posterior margin 

 slightly curved, because of the low, backward directed, synarthrial 

 tubercle; distal tongue narrow, very much prolonged. Arms X, 40 mm., 

 (broken, probably about fiO mm.) Br — s 1 basally contiguous inside, 

 the outer border twice or three times as broad as the innei' one. Br 2 



