170 “Part IIL. —Fifteenth Annual Report 
(fiz. 11). Antenne, with secondary branches elongate and slender, three- 
jointed ; the middle joint very small, the other two sub-equal (fig, 13). 
Mandibles and other mouth organs somewhat similar to those of Stenhelva 
hispida, Brady (figs. 14, 15). The first pair of swimming feet are 
moderately stout ; the inner branches, which are rather longer than the 
outer, have the first joint equal to nearly twice the entire length of the 
second and third, which are short and sub-equal; the joints of the outer 
branches are nearly of equal length, and armed with strong marginal 
spines ; a stout spine springs from both the exterior and interior angles 
of the second basal joint (fig. 16). The inner branches of the next 
three pairs are rather shorter than the outer branches; in the fourth 
pair the outer branches are nearly one and a half times longer than 
the inner branches (fig. 18). The basal joints of the fifth pair are 
broadly ovate, and produced interiorly so as to extend to near the ex- 
tremity of the secondary joints; a short stout seta springs from the dis- 
tal half of the inner margin of the basal joint, and four setze from the 
broad and somewhat truncate apex, the two middle sete being considerably 
longer than the others; secondary joints sub-quadrangular, and furnished 
with five sete of variable lengths round the distal end (fig. 19). Caudal 
stylets short, not half the length of the last abdominal segment; the 
principal seta of each stylet very stout, and somewhat fusiform (fig. 21). 
Description of the Male.—'The male differs from the female in having the 
antennules modified to form powerful grasping organs (fig.12). The inner. 
branches of the second pair of feet are, like those of the males of Stenhelia 
ima, tavo-jointed, and rather shorter than the outer branches, and are each 
provided with two stout spine-like terminal appendages (fig. 17). The fifth 
pair, which are smaller than those of the female, have the basal joint 
armed interiorly with two stout apical spines ; the secondary joint is pro- 
vided with two stout spines on the inner margin,—the posterior spine 
being longer than the other; two sub-apical spines exteriorly, one short 
and one of moderate length, and a moderately lone apical seta; three 
sete also spring from a small foliaceous appendage on the first abdominal 
seoment, and immediately behind the fifth pair of feet (fig. 20). 
Habitat.—Kilbrennan Sound ; not very common. 
Remarks.—This species is somewhat intermediate between Stenhelra 
hispida and Stenheliaima. It has the stout build of the first, while the 
structure of the second feet in the male somewhat resembles those of the 
male of Stenhelia ima ; but one of the characters which, at a glance, dis- 
tinguishes this from the other species, is the remarkably stout seta on each 
of the caudal stylets, 
Cletodes tenuspes, sp. n. (Pl. I. figs. 19-27). 
Description of the Female.—Length about ‘55 mm. (.th of an inch). 
Somewhat like Cletodes propinqua in general appearance (fig. 19). An- 
tennule small, five-jointed ; the second and last joints are longer than the 
others, but the fourth is very small; the last three joints bear moderately 
stout setiferous spines (fig. 20). The secondary branches and the an- 
tenn are rudimentary ; they are each reduced to a single seta (fig. 21). 
Mandibles well developed ; palp small, one-jointed (fig. 22). Posterior 
foot-jaws moderately stout (fig. 23). All the swimming feet are slender, 
especially the inner branches,—those of the fourth pair being almost rudi- 
mentary. In the first pair the length of the inner branches is equal to 
about two-thirds the length of the outer branches ; the first joint 1s very 
short, but the second is elongate (fig. 24), In the next three pairs the inner 
branches, which, like those of the first pair, are all two-jointed, are much, 
shorter than the outer branches ; those of the fourth pair are very slender, 
