150 Part IIT.—Fifteenth Annual Report 
Jonesiella spinulosa (Brady and Robertson).—Near Largabruach, 
Upper Loch Fyne, in dredged material (G.). Jonesiella fusiformis, which 
in some localities appears to be a more common species than the one 
recorded here, has not yet been observed in any of the collections made 
by the ‘Garland’ in the Clyde. 
Delavalia robusta (Brady and Robertson).—Near Largabruach, Upper 
Loch Fyne, in dredged material; not very rare (G.). 
Delavalia mimica, sp. n. (Pl. I. figs. 1-9.). 
Description of the Female.—Length, °65 mm. (7th of an inch). Body 
moderately stout, and somewhat like Delavalia reflexa in general appear- 
ance. Antennules eight-jointed, the penultimate joint is smaller than 
any of the others, while the last is rather more elongate than either of the 
preceding three or four joints (fig. 2). The antenne and mouth organs 
are somewhat similar to those of D. reflexa ; the principal seta of the end 
joint of the mandible-palp is moderately stout and curved, and of con- 
siderable length (fig. 3). The inner branches of the first pair of swim- 
ming feet are three-jointed, the first joint is rather longer than the entire 
length of the three-jointed outer branches, but the second and third are 
short, and together scarcely equal to half the length of the first joint 
(fig. 5). The second, third, and fourth pairs do not differ much from 
those of other species of De/avalia (fig. 6 shows the fourth pair). The fifth 
pair, which have a general resemblance to those of other species of Dela- 
valia, differ in the following points: the armature of the basal joint con- 
sists of three moderately short and rather stout spines, situated on the 
apex of the slightly produced inner portion, in addition to two spiniform 
setze, one of which is exterior and the other interior to the spines; the 
innermost of the three spines, which is also the largest, bears two minute 
marginal hairs near its extremity—one on either side. The secondary joint 
is lamelliform, moderately broad, and subcylindrical. The margins, which, 
in the middle of the joint are somewhat parallel, converge towards both 
ends, and the distal end, which for this reason assumes a triangular form, 
is provided with five sete and a short stout spine ; this spine is situated at 
the beginning of the exterior distal slope, while the five sete.are arranged, 
two on each sloping distal margin, and one at the apex, as shown in the 
drawing (fig. 7). | 
Description of the Male.—The male differs little from the female except 
in the form and armature of the fifth pair of feet. The basal joint of the 
fifth pair bears interiorly a single, and somewhat peculiar, stout, and mode- 
rately large spine, and a small spiniform seta; the secondary joint is 
small, subovate, and armed with three spines on the oblique distal end of 
the exterior margin ; there is also a seta at the apex and another on the 
inner margin, as shown by the drawing (fig. 8). The second pair in the 
male were not modified, as is sometimes the case, but resembled those of 
the female. 
Habitat.—Loch Gair, Upper Loch Fyne. It has also been obtained in 
other parts of the Clyde district, and in the Firth of Forth at Granton. 
Remarks.—This species differs very markedly from any other Delavalia 
known to me in the structure of the first pair of swimming feet; this pair 
are not very unlike those of some species of Dactylopus or Ameira ; but 
as the structure of the mandibles and of the fifth pair of feet is that of 
