34 
THE VOYAGE OF H.M.S. CHALLENGER. 
processes on the four somites of the hind body, and of movable spinules on the sub- 
median spines of the telson. It differs from Mier’s genus Leptosquilla in the enlarge- 
ment of the tips of the eyes, and in the presence of distinct submedian carinse on all the 
five somites of the hind body. 
Squilla lata, n. sp. (PI. III. figs. 1, 2, 3). 
Diagnosis . — The dactylus of the raptorial limb has six teeth, and the pectinations 
on the inner edge of the second joint are arranged in an undulating line. Ejms 
directed forward, nearly cylindrical, with corneal portion hardly wider than base. 
Appendages of exposed thoracic limbs strap-shaped. Hind body gradually increasing in 
width backwards to the fifth abdominal somite, which is equal in breadth to one-fourth of 
the total length. Inner spine of basal joint of sixth abdominal appendage with a rounded 
tooth on its outer edge, and, on its inner edge, a series of acute dentations gradually 
increasing in length distally. Rostrum elongated, nearly twice as long as wide. 
Submedian dorsal carinae absent on the first and second thoracic and second and third 
abdominal somites, and obsolete on all the others except the sixth abdominal, where they 
are well developed. Submedian spines of telson curved at their tips ; and flattened, broad 
and rounded at their bases, with no intermediate dentations. Dorsal surface of telson 
obscurely marked by curved lines. Paddle of exopodite of sixth abdominal appendage 
as long as second joint. There is no spine on the dorsal surface of the basal joint of the 
sixth abdominal appendage. Lateral edges of second thoracic somite acute, those of the 
third and fourth obliquely truncated. 
Special Description . — Rostrum twice as long as broad, and ending in a rounded 
point. Antero-latera.1 angles of carapace acute, posterior angles rounded, anterior border 
subacute, posterior border nearly transverse. No median carina on rostrum or carapace, 
the gastric area of which is only slightly convex. On each side of carapace there is a 
carina which reaches nearly to the cervical suture, behind which there is a short carina 
on each postero-lateral lobe. A median dorsal tubercle close to the posterior edge of the 
carapace. Length of rostrum and of carapace x 2 u% 5 o> an( l °f the two of the 
total length. Hind body gradually and uniformly increasing in width from in front back- 
wards to the fifth abdominal somite, which is more than twice ( f f-g-) as wide as the second 
thoracic somite. The second thoracic somite has no dorsal carinse; the third has one lateral 
carina on each side, but no submedians ; the fourth and fifth thoracic somites have very 
obscure and short median carinse which converge anteriorly, as well as lateral carinae. 
The first five abdominal somites have three lateral carinse on each side. The first three 
have no submedian carinse, while there are short obsolete submedian carinse on the fourth 
and fifth, converging anteriorly. The third, fourth, and fifth abdominal somites have 
each a median dorsal tubercle. The sixth abdominal somite has two well marked sub- 
