of the Fishery Board for Scotland. 257 



Cletodes lata* n. sp. (provisional name). (PI. X. figs. 10-18). 



Length '7 mm., body depressed, moderately broad, the last thoracic and 

 first abdominal segments rather narrower than those that precede or 

 follow ; all the segments, but especially the three first abdominal segments, 

 have the posterolateral angles more or less sharply angular ; the last 

 abdominal segment nearly as long as the second and third together ; the 

 first body segment broadly triangular, the breadth being rather greater 

 than the length. Anterior antennae shorter than the first body segment, 

 stout, six-jointed, the second and fourth joints smaller than any of the 

 others, the proportional length of the joints as in the formula 



1 • 3 • 8 • 2 • 4 • 10 

 1 • 2 • 3 • 4 • 5 • 6 * 



All the joints, with the exception of the first, are armed with stout spini- 

 form setae, and a stout elongate sensory filament springs from the third 

 joint. Posterior antennae two-jointed, secondary branch obsolete, and 

 represented by a small hair arising from a slightly produced part of the 

 margin, and near the middle of the first joint of the primary branch. 

 Mandible with three strong teeth ; mandible palp small, cylindrical, one- 

 jointed (fig. 13). Posterior foot-paw furnished with a long slender curved 

 terminal claw. The first joint of the outer branch of the first pair of 

 swimming feet half as long again as either the second or the third joint ; 

 the inner branch, which consists of two short equal joints, is about as 

 long as the first joint of the outer branch. The middle joint of the outer 

 branches of the second, third, and fourth pairs is shorter than either the 

 first or last joints ; the first joint of the inner branches is not half the 

 length of the second. Fifth pair foliaceous, the inner lobe of the 

 basal joint broad, bearing two elongate, stout, subterminal setae ; the outer 

 lobe is in the form of an elongate cylindrical process, bearing a moderately 

 long terminal setae ; second joint elongate, ovate, the outer margin with 

 three small hairs widely apart, a moderately long apical seta, and a very 

 small hair on the inner margin. A variety (i) occurs having the second 

 joint very narrow, with the apical and three marginal hairs very long. The 

 caudal stylets short, widely apart, and bearing one moderately long and 

 a few small setae. 



Habitat. — Off St Monans, Firth of Forth. Several specimens were 

 obtained among dredged material. 



Tlialestris liarpactoides, Claus. (PI. XI. figs. 13-16). 



1863. Tlialestris liarpactoides, Claus, 'Die frei lebenclen Copepoden,' 



p. 133, pi. xix. figs. 2-12. 

 1880. Tlialestris liarpactoides, Brady, 'Brit. Copep.,' vol. ii. p. 127, 



pi. 1. figs. 9-16 ) pi. lix. fig. 1. 



Habitat. — Off St Monans, Firth of Forth. A few species were obtained 

 among dredged material. It somewhat resembles Th. rufocincta, but is 

 more slender. The colour of the Forth specimens was bluish. There is 

 also a narrow but distinct belt, due to difference of colour or structure, 

 along the margins of the body segments. Its slender form, the form of 

 the posterior foot-jaws (fig. 13), of the first pair of feet, and of the fourth 

 and fifth pairs, serve to distinguish this from other British species of 

 Tlialestris. The marginal spines of the outer branches of the second, 

 third, and fourth swimming feet of Th. rufocincta are strongly setose, of 

 Th. liarpactoides finely ciliated. In the posterior foot-jaw in Th. rufo- 

 cincta the terminal claw has three prominent though slender setae spring- 



* Lata, broad, referring to its comparatively broad outline when viewed dorsally. 

 R 



