210 Part III. — Eleventh Annual Report 



margin of each stylet is ciliated, the outer margin plain ; terminal setae, 

 four unequal, the two intermediate densely plumose, and slightly thickened 

 in the middle. 



Habitat.- -' Rath ground,' north of the Bass Rock, Firth of Forth, rare, 

 in material dredged November 20th, 1889. One specimen was also ob- 

 tained in some material dredged in 1892 off the south end of the Island 

 of Mull. 



Cyclopicera purpurocincta appears to be intermediate between Cyclopi- 

 cera gracilicauda and Cyclopicera nigripes, but is at once distinguished 

 from either by the colour of the second, third, and fourth thoracic seg- 

 ments. 



Cyclopicera lata, Brady. (PI. III. figs. 41, 42.) 



1872. Cyclopicera lata, Brady, ' Nat. Hist. Trans. Northumb. and 



' Durham,' vol. iv. p. 433, pi. xviii. figs. 3-8. 

 1868. Ascomyzon echinicola, Norman, 'Brit. Assoc. Report,' p. 



300. 

 1880. Cyclopicera lata, Brady, ' Mon. Brit. Copep.,' vol. iii. p. 56, 



pi. lxxxix. fig. 12; pi. xc. figs. 11-14. 



Habitat. — West of Gullane Ness, Firth of Forth. Washed from sponges, 

 1889. Several specimens were obtained. Cyclopicera lata closely re- 

 sembles Artotrogus boeckii, Brady, which I have also obtained by washing 

 Chalina oculata (a kind of sponge), and for this reason I had some doubts 

 as to its being distinct, and deferred recording its occurrence ; but having 

 recently been enabled to make a careful examination of its structure, I 

 have now no doubt that it is the species described as Cyclopicera lata in 

 the Monograph of the British Copepoda : the structure of the anterior and 

 posterior antennae is the same, the mandible palp, which is very small, 

 bears two apical setae, one very long, slender, and sparsely plumose, and 

 one very short (fig. 41). The abdomen is less robust, and the caudal 

 stylets distinctly more elongate than in Artotrogus boeckii. 



Genus Par artotrogus, T. and A. Scott (1893). 



Parartotrogus richardi, T. and A. Scott. (PI. IV. figs. 25-35.) 



1893. Parartotrogus richardi, T. and A. Scott, 'Ann. and Mag. 

 'Nat. Hist.,' ser. 6, vol. xi. p. 210, pi. vii. figs. 1-11. 



Habitat. — Near Fidra, Largo Bay, the ' Fluke Hole ' (off St Monans), 

 and other parts of the Forth between Inchkeith and May Island. 



This species, which is only about the one-fiftieth of an inch in length, 

 is readily distinguished by the peculiar subrhomboidal form of the 

 cephalo-thorax (fig. 25). Seen from above, the sides of the cephalo-thorax 

 diverge rapidly from the broad, almost truncate rostrum to about the 

 middle of the first segment, where they form bluntly-rounded angles by 

 again tapering quickly towards the last segment ; the greatest breadth 

 of the first segment is about equal to three fifths of the entire length of 

 the animal ; the abdomen is moderately stout, and equal to about three- 

 sevenths of the length of the cephalo-thorax. Anterior antenna, nine- 

 jointed, sparingly setiferous, the third, fourth, and fifth joints much 

 shorter than any of the others. The relative length of the joints is shown 

 by the formula — 



12 • 12 • 6 • 5 -6 • 10 ' 12 • 13 -4 • 

 1 ■ 2 "3 -4 • 5 ' 6 • 7 * 8 • 9 • 



Posterior antennae four-jointed, and terminating in a stout hooked claw ; a 

 small curved and stout spine springs from near the middle of the last 



