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Part III. — Eleventh Annual Report 



thoracic segment equal in breadth to about four-fifths the length, and 

 rather longer than the entire length of the other thoracic segments ; fore- 

 head moderately broad, somewhat produced and truncate. Anterior 

 antenna; slightly longer than the first thoracic segment, eleven-jointed, 

 moderately stout, and sparingly setiferous ; the fifth joint distinctly 

 shorter, the first and seventh subequal and longer than any of the others. 

 The formula shows very nearly the comparative length of the joints : — 



23 • 7 • 12 • 8 • 5 • 11 • 22 • 18 • 11 • 16 • 19 • 

 1 • 2 * 8 * 4 • 5 • 6 • 7 - 8 • 9 * 10 • 11 ■• 



Posterior antennae four-jointed, second and third joints smaller than the 

 first and last. A long plumose seta springs from the lower distal extremity 

 of the first joint; opposite to this, on the upper edge, are two short plain 

 setae : there is a small seta near the middle of the upper margin of the 

 second joint, and on the upper margin of the third joint there is a row of 

 small spiniform setae arranged in a pectinate manner, — the setae at the 

 distal being much longer than the posterior ones ; the extremity of the 

 posterior antennas bears a fascicle of setae, one of which is longer and 

 plumose; the 'second, third, and last joints are ciliate on the lower 

 margin. The base of the mandible is provided with two long plumose 

 and one very small plain setae (fig. 4). Anterior footjaws short, four-jointed, 

 the first being equal in length to the other three ; the last is very small ; 

 the first joint bears three setae, the second two, and the third and fourth 

 one each. These setae are furnished with short bristle-like cilia arranged 

 somewhat widely apart; the fourth joint also bears two small terminal 

 plain setae (fig. 5). Posterior footjaw stout, well developed, four-jointed ; 

 the first joint bears two plumose setae that arise from a papilliform process 

 near the upper distal margin; a seta with bristle-like cilia springs from 

 a conical base of the upper margin of the second joint, at the distal end of 

 the same joint, two similar setae arise from an elongate digitiform process ; 

 the upper part of the distal end of the third joint is produced so as to 

 extend fully beyond the last two small joints, and terminates in a seta 

 similar to those just described and a stout elongate spine (fig. 6). The 

 basal joint of the fifth pair of feet is furnished with one stout seta 

 plumose of the distal half ; a long stout seta also plumose on the distal 

 half springs from {he end of the second joint; on the upper margin of 

 the same joint, and near the base of the terminal seta, there is a fringe of 

 stout cilia; and a short, moderately-stout spine, serrate on the interior 

 edge, springs from the lower margin. The abdomen tapers very gradually ; 

 the posterior margins of the abdominal segments are fringed with small 

 teeth ; the last segment is considerably longer than the preceding one. 

 Caudal stylets nearly one and a half times the length of the last abdominal 

 segment. There is a small toothed notch on the outer margin near the 

 middle of the proximal half of each stylet, and a small seta springs from 

 near the middle of the lower half ; the terminal setae are plumose and of 

 moderate length. 



This species was first obtained in the upper reaches of the Firth of 

 Forth in Nov. 1887; but though thus apparently a marine species, Dr Brady 

 suggested that its real habitat might be £ in some of the streams or ponds 

 ' whose contents find their way into the Forth.' The discovery of this 

 species in Loch Morar — the second time it lias been observed in 

 Scotland — shows that the explanation of its occurrence in the Forth 

 estuary suggested by Dr Brady is probably correct. Cyclops eiodrti was 

 of frequent occurrence in Loch Morar. 



1 Cyclops Kaufmanni, LTljanin. 



1875. Cyclops Kaufmanni, Uljanin, Reise in Turkestan (Crust.), 



p. 38, t. aril, figs. 2-4. 

 1891. Cyclops Kaufmanniy Brady, Revision, p. 21, PI. VII. fig. 3 



