ZENOMETRINAE 157 



times as long as broad. The distal edges of the segments are produced into a small 

 number of spines ; the entire dorsal edge of one or two of the lower segments may be 

 rough with spines. 



On some arms P^ is a genital pinnule. 



P3 is usually the first genital pinnule and it carries a large fusiform testis — for the 

 specimen is a male — along the third to seventh segments. A Pg which is of 9 segments 

 and 5 mm. long appears to be nearly complete. The first two segments are short, the 

 remainder elongated, the fourth and succeeding segments being four or more times as 

 long as broad. In the other genital pinnules the segments are not so elongated. The 

 genital pinnules extend to P^ or P12 ; in the middle genital pinnules the gonad lies along 

 the third to eighth segments. 



P, may be taken as an example (Fig. 7 d). It is of 13 segments and 6 mm. long. The 

 first two segments are short. The third to eighth increase from two to four times as long 

 as broad. The distal end of each is flared out into a thorny cup around the base of the 

 next ; the base of each is swollen to a less extent. The distal segments are longer, more 

 regular and more slender. 



The outer pinnules are of about 18 segments and 8 mm. long. The first two segments 

 are short, the third and fourth longer than broad, the remainder about twice as long as 

 broad. Their distal edges are thorny. 



The disk cannot be seen. 



Sacculi are numerous and conspicuous along the pinnule ambulacra. 



The pinnule ambulacra are lined by rod-like side plates, three to each segment. They 

 are mostly simple smooth rods but they may be knobbed and they may have forked or 

 perforated ends ; at the end of some pinnules they are shorter and have a different, more 

 plate-like form (Fig. 7 e). Strongly knobbed spicules occur in the tentacles. 



The following is a colour note made at the time of capture : " Proximal half, including 

 cirri, orange yellow; distally the arms and pinnules are much banded with delicate 

 grey, producing a dark effect." 



E.fraseri is distinguished from the other species of the genus by its greater number of 

 cirrus segments. Apart from this difference the cirri are generally similar to those of the 

 other species. 



Eumorphometra marri, n.sp. (Plate IV, fig. 3) 



St. 1948. 4. i. 37. East of Clarence Island, 60° 49-4' S, 52° 40' W. 490-610 m. Gear DRR. 

 One specimen and fragments of another. 



Description. The single specimen is in good condition with arms of about 60 

 brachials, 25 mm. long. 



The centrodorsal is hemispherical with a rounded dorsal pole; its ventral edge is 

 straight. The cirrus sockets are arranged in two or three closely placed alternating rows. 



Cirri XLII, 23-28 ; the apical are of fewer segments and shorter than the peripheral. 

 The first segment is nearly twice as broad as long ; the second is two-thirds as long as 



