THE PLANKTON OF THE FAROE CHANNEL AND SHETLANDS, 369 



spinosus in the possession of four furcal bristles. The whole length 

 of my specimen is 1'19 mm., and the relative length of abdomen to 

 cephalothorax is as 1 to 4, somewhat different from Giesbrecht's measure- 

 ments, making the body in the Shetland specimen larger in proportion. 

 Thaumaleus longisinnosus was taken by Bourne at Plymouth in 1890, 

 and Th. daparedii by Scott in 1889 in the Firth of Forth, and by 

 Thompson in 1889 in Liverpool Bay; but so far as I am aware no 

 Thaumaleus has been captured so far north as Shetland before. 



AUGAPTILUS ZETESIOS, ?i. sp. Plate III. 



Total length 471 mm., of moderate transparency. Head separate 

 from thorax, with weak rostrum situated on a papilla. Abdomen three 

 segments, the genital longer than both the others together. Furcal 

 segment four times as long as broad. Anterior anteunte of twenty- 

 five segments, and reaching considerably beyond the end of the furca. 

 The outer branch of the posterior antennas is a little the longest. The 

 hairs of the outer branch are very long and feathered ; those of the 

 other branch shorter and naked. Mandibles have a long and thin chew- 

 ing end with two large and one very small teeth. Maxilke have all 

 the outer and inner lobes except the first (of each) suppressed. The 

 bristles are of very great length. The bristles of the second basal and 

 endopodite of the anterior foot jaws carry two series of the peculiar 

 " hutpiltzformigen Anhange" characteristic of Augaptilus (see Fig. 12). 

 In the posterior foot jaws the bristles of the endopodite are similarly 

 armed. The swimming feet have each three segmented inner and outer 

 branches. The outer spine on the first segment of the exopodite of the 

 first foot is very long and closely haired, and the distal segment carries 

 two long tapering naked bristles. In the second and third pairs the 

 long bristle on the second basal (which is present in the fourth feet) is 

 absent. The third segments of the exopodites of the second, third, 

 fourth, and fifth feet have a very convex outer margin, and the spines 

 are very rudimentary. The bristles at the end (especially in the third 

 and fourth feet) are stiff and curved inwards, with long hairs on the 

 inner aspect, and short stiff hairs on the outer. The fifth feet have a 

 rather longer (proportionally) endopodite, and the last joint of the 

 exopodite is shorter than in the second to fourth pairs, while the distal 

 segment of the inner branch is comparatively longer than in the other 

 feet. The second segment of the outer branch carries a long, stout (at 

 the base), and tapering spine nearly as long as the joint and armed on 

 the inner side with stout teeth from the base to the distal end, and 

 many short teeth on the surface and a few stout teeth on the outer 

 proximal margin. This Copepod bears some resemblance to Aug. longi- 



