40 



THE VOYAGE OF H.M.S. CHALLENGER. 



The species may be readily distinguished by the following features. The rostrum of 

 S<juiUa lata is twice as long as wide, and it gradually tapers to the narrow rounded tip, 

 while it is trigonal in Squilla fasciata, hardly longer than wide, with a broad tip. The 

 lateral edges of the third and fourth thoracic somites are obliquely truncated in Squilla 

 lata, and rounded in Squilla fasciata. The paddle of the exopodite of the sixth 

 abdominal appendage of Squilla lata is as long, and that of Squilla fasciata half as long, 

 as the second joint. The dorsal surface of the telson of Squilla lata is obscui'ely marked 

 by curved lines, and the submedian posterior spines are curved at the tip and broad at 

 the base, with no intermediate dentations ; while the dorsal surface in Squilla fasciata 

 is marked by longitudinal carinte, and the submedian spines are acute with intermediate 

 dentations. 



In addition to these more conspicuous points, the following minute differences serve to 

 show the distinctness of the two forms : — 



The antennae are longer than in Squilla lata ; the carapace is nearly transverse in 

 front and deeply notched behind, while in Squilla lata it is sul^acute in front and nearly 

 transverse behind. All the carinse of the abdominal somites, except the inner pair on 

 the first, end in spines in Squilla fasciata, while in Squilla lata only those on the sixth 

 somite end in spines, and there is no dorsal spine on the basal joint of the sixth abdominal 

 appendage, while there is an acute spine in Squilla fasciata. 



The following measurements in thousandths of the total 

 diflference between the two. 



length also exhibit the 



Squilla chlorida, n. sp. (PL 11. figs. 1-5). 



1 Clorida decorata, Wood-Mason, J. Proc. Asiatic Soc, Bengal, Dec. 1875. On some new species 

 of Stomatopoda Crustacea, Ann. and Mag. Nat. Hist., ser. 4, vol. xvii., 1876, p. 263. 



l.Chloriildla decorata, Miers, E. J., On the Squillidae, Ann. and Mag. Nat. Hist., ser. 5, 

 vol. V. p. 15, 1880. 



Diagnosis. — Eyes directed forward, with basal portion swollen, and a little 

 wider than corneal portion. Appendages of thoracic limbs strap-shaped. Five teeth on 



