REPORT ON THE STOMATOPODA. 
67 
great interest of this genus, I give, in addition to the descriptions of the species which 
are represented in the Challenger collection, brief diagnoses of the other known 
species. 
1. Protosquilla elongatci, n. sp. (PL XY. figs. 2, 12; PI. XYI. fig. 4). 
Diagnosis. — Protosquilla with the median spine of the rostrum long and 
slender, and the antero-lateral spines bifurcated at the tips. Carapace elongated, two- 
thirds as wide as long, with antero-lateral angles acute. Second thoracic somite 
exposed and subacute laterally. Hind body wider than carapace. Lateral angles of 
third, fourth, and fifth thoracic somites nearly straight, with rounded angles. Sixth 
abdominal somite with a thickened transverse ridge along its posterior border, 
from which four thickened carinse, two submedian and two submarginal, run forwards 
to the anterior edge of the somite, the two outer carinae being obscurely divided 
into three lobes. Suture between sixth abdominal somite and telson distinct but 
immovable. 
Telson a little wider than long, with a thickened median carina, and on each side of 
this a very wide and prominent curved lateral carina. Telson with a deep notch on 
the middle line behind, and on each side of this an obtusely rounded lobe, the outline of 
which is continuous in a dorsal view, but with traces of three marginal spines on the 
ventral surface. Endopodite of uropod triangular. First antennae short. An acute 
spine on anterior edge of first joint of second antenna. 
General Description . — Median spine of rostrum slender and acute, slightly dilated at 
base, and reaching nearly to the tips of the eyes, which are cylindrical, with the corneal 
portion inclined backwards externally. Antero-lateral angles of rostrum long, acute, 
curved forwards, and divided at the tip into two spines one above the other. Carapace 
narrower than hind body, much longer (f -|) than wide, and slightly emarginated. The 
antero-lateral angles ending in short spines, the postero-lateral angles rounded. Gastric 
area distinct, rectangular, slightly convex, with gastric suture continued nearly straight 
to posterior edge. Second thoracic somite exposed, narrow, and subacute at lateral 
edges. The following thoracic somites wider than the carapace and nearly as wide as 
the hind body. The lateral edge of the third is longitudinally truncated, that of the 
fourth obliquely truncated, so that the somite is wider at the antero-lateral than at the 
postero-lateral angle. The fifth is produced into a subacute lobe. First five abdominal 
somites smooth dorsally, and almost but not quite equal in width ; the width of the 
first being and that of the fifth r \foV °f the total length. The postero-lateral 
angles of the abdominal somites are subacute. The sixth abdominal somite is immov- 
ably united to the telson, but the suture is distinct. The posterior edge of the dorsal 
surface is elevated into a thick, obscurely defined, rounded transverse ridge, from which 
