of the Fishery Board for Scotland. 463 
Leptopontia curvicauda, T. Scott (sp. n.). Pl. XXIT., figs. 26-35. 
Description of the Female.—Length ‘6mm. (about =, of an inch). 
Body slender, cylindrical; cephalo-thoracic segment moderately short, 
scarcely three times the length of the next one; rostrum short (fig. 
26). . 
The antennules are slender and longer than the cephalo-thoracic 
segment, seven-jointed, the first joint is longer than any of the others, the 
second and third are sub-equal, the fourth, fifth, and sixth joints are each 
about half the length of the third, while the end joint is about twice the 
length of the one next to it (fig. 27). The formula shows approximately 
the proportional lengths of the different joints :— 
Proportional lengths of the joints,- 28° 18°17 °8:7:*7 
Numbers of the joints, - - 24° D5 oh AS oe Omnia 
Antennz slender, consisting of two elongated joints; the secondary 
branches are represented by a single minute hair (fig. 28). 
Mandibles slender and elingated, the biting end is _ obliquely 
truncated and armed with a number of small teeth; the mandible-palp 
is also elongated, and one branched, the basal joint is moderately stout, 
and about twice the length of the single-jointed branch, and is furnished 
with a few small setz (fig. 29). 
The posterior foot-jaws (fig. 30) are not unlike those of Tetragoniceps 
incertus, 'T, Scott. The inner branches of the first pair of thoracic feet are 
slender, elongated, and two-jointed, the end joint being only about one-third 
the length of the other ; the outer branches, which are three-jointed, are 
searcely half the length of the inner branches (fig. 31). In the second, 
third,*and fourth pairs the outer branches are long and slender, and three- 
jointed ; the joints of the outer branches of the second pair are sub-equal 
in length, but in the outer branches of the third and fourth pairs the first 
and second joints are sub-equal and rather longer than the end joints. 
The inner branches of the same three pairs are short and two-jointed ; 
in the second pair the inner branches are rather longer than the first 
joint of the outer branches ; but in the third and fourth pairs the inner 
branches are shorter than the first joint of the outer branches, as shown 
by the drawing (figs. 32, 33), 
In the fifth pair the basal joints are moderately large and foliaceous, 
the inner produced part is broadly rounded, and bears three apical sete, 
and the secondary joints, which are very small, also carry three setze (fig. 34). 
The last abdominal segment is armed on the median dorsal aspect 
with a backward-pointing tooth as shown in figures 26 and 35. 
The caudal furca, which are nearly as long as the last abdominal 
segment, become gradually attenuated towards the distal extremity ; and 
in all the specimens that have been obtained the furca are distinctly 
recurved as shown in the habitus drawing (fig. 1). 
Habitat.— Dredged in the Firth of Forth at Station VI. (off St. Monans) 
on July 8th, 1901; not very common. 
Remarks.—Odd specimens of this species have been observed from 
time to time for a considerable while past, but the first specimens were ~ 
put aside as being probably immature forms of some species already 
described: i am now, however, convinced that they are distinct 
Leptopontia in some respects resembles both Mesochra, Boeck, and 
Tetragonicens, G. 8. Brady, in its structural details, but in the absence 
of a secondary branch to the antenne, in the elongate and slender form of 
