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 elongata, n. sp. (PI. XV. figs. 2, 12; PI. XVI. fig. 4). 



Diagnosis. — Protosquilla with the median spine of the rostrum long and 

 slender, and the autero-lateral spines bifurcated at the tips. Carajjace elongated, two- 

 thirds as . wide as long, with antero-lateral angl-es 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 carinas being obscurely di\dded 

 into three lobes. Suture between sixth abdominal somite and telson distinct but 

 immovable. 



Telson a little Tvdder than long, mth 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 Descnption. — 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 fom'ards, 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 xWu. and that of the fifth ^^, of 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 



