ZENOMETRINAE i6i 



of cilia are hoop-like and clear, but the first and second bands are difficult to follow ; 

 the former seems to surround a depression, the apical pit, and the latter to coalesce with 

 it for a portion of its course. 



Kempometra n.g. 



Diagnosis. A genus of Zenometrinae including species of small size; Pi and P^, are 

 absent; the centrodorsal is rounded conical, not higher than broad at the base, its 

 surface showing no differentiation into radial areas; cirrus sockets in 15 closely crowded 

 columns; cirri with few, up to 16, segments all of which but for the first two and the 

 penultimate are longer than broad ; no dorsal spines ; opposing spine usually absent, if 

 present more or less vestigial ; brachials and pinnulars have everted and spinous ends ; 

 viviparous. 



Kempometra grisea n.sp. (Plate IV, fig. 4) 



St. 1957. 3. ii. 37. 7 miles east of Cape Bowles, Clarence Island, South Shetlands. 830 m. 

 Gear DRR. Bottom: rough, stony. Two specimens, both females. 



Description. One of the specimens is almost complete with arms nearly 40 mm. 

 long, of more than 60 brachials ; in the other all but one of the arms are broken. 



The centrodorsal is a cone nearly as high as broad with its ventral edge produced 

 into low corners interradially. The cirrus sockets are arranged in fifteen closely crowded 

 columns, three or four to a column, the sockets of one column alternating in position 

 with those of the next. The sockets are considerably longer than wide. 



Cirri ca. L; 9-16, usually 14, up to g mm. long. The apical cirri are considerably 

 smaller than the peripheral ; they may be only half as long and they are usually of 9-12 

 segments. The description which follows is of the longer cirri (Fig. 9 a). The first two 

 segments are wider than long though the second is longer than the first. The third is 

 about one-and-a-half times as long as broad ; the fourth to the sixth are more than twice 

 as long as broad. The segments beyond the sixth gradually decrease in length, though 

 all, except the penultimate, which is about as broad as long, are longer than broad. 

 They are slightly wider than the first six segments and each is a little wider distally than 

 proximally, but there is no trace of a dorsal spine. The whole cirrus is laterally com- 

 pressed, more strongly in the distal than in the proximal half. The opposing spine is 

 usually absent but may be represented by a minute terminal tubercle. The terminal 

 claw is small and hyaline. The texture of the cirrals as of the brachials is very finely 

 thorny. 



The radials are fairly long and wider distally than proximally ; the length is less than 

 one-third the greatest width (Fig. 9 b). The costals are widely separated from one another 

 for the whole of their length. They are deeply incised by the posterior projection of the 

 axillaries ; whereas the lateral edges are more than half as long as the greatest width, the 

 length in the mid-line is only about one-tenth of the width. The axillaries are longer 

 than broad and form shoulder-like projections with the costals ; the two proximal sides 

 are slightly, the two distal sides strongly, concave. The shapes of these ossicles and of the 



