34 THE VOYAGE OF H.M.S. CHALLENGER. 



processes on the four somites of the bind body, and of movable spinules on the sub- 

 median spines of the telson. It difJers from Mier's genus Leptosquilla in the enlarge- 

 ment of the tips of the eyes, and in the presence of distinct submedian carinas 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 Hmb has six teeth, and the pectinations 

 on the inner edge of the second joint are arranged in an undulating line. Ej^es 

 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. Eostrum elongated, nearly twice as long as wide. 

 Submedian dorsal carinse 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 telsou curved at their tips ; and flattened, broad 

 and rounded at their bases, with no intermediate dentations. Dorsal surface of telson 

 obscurely marked l)y curved lines. Paddle of exopodite of sixth abdominal apj)endage 

 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-lateral angles of carapace acute, posterior angles rounded, anterior Ijorder 

 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 poster o-lateral lobe. A median dorsal tubercle close to the posterior edge of the 

 carapace. Length of rostrum xuSt?' '^^^^ of carapace jIjo^' ^"^^ o^ ^^^ two ^^o^oIj 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 (|-|^) as wide as the second 

 thoracic somite. The second thoracic somite has no dorsal carinas; the third has one lateral 

 carina on each side, but no submedians ; the fourth and fifth thoracic somites have very 

 obscure and short median carin^e which converge anteriorly, as well as lateral carinas. 

 The first five abdominal somites have three lateral carinas on each side. The first three 

 have no submedian carina3, while there are short obsolete submedian carinas 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- 



