of the Fishery Board for Scotland. 
257 
CTetodes 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 j the 
first body segment broadly triangular, the breadth being rather greater 
than the length. Anterior antenna? 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 
10 • 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 seta 1 , 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 (1) 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. 
TJialestris harpdeioides, Claus. (PI. XI. figs. 13-16). 
1863. Thcdestris harpadoides, Claus, 'Die frei lebenden Copepoden/ 
p. 133, pi. xix. figs. 2-12. 
1880. Thalestris Jiarpactoides, 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 Tlx. 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 
Thalestris. The marginal spines of the outer branches of the second, 
third, and fourth swimming feet of Th. rufocincta are strongly setose, of 
Th. Jiarpactoides 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 
