CEFSTACEA OF THE MEEGTTI AKCHIPELAGO. 57 



of its breadth (i. e. the distance between the fourth antero-lateral 

 teeth} to the length being as 12|- to 9. As regards the structure 

 of the upper surface of the cephalothorax, this species nearly 

 completely agrees with S. indica, the anterior half presenting the 

 same minutely granulated transyerse elevated lines, in the same 

 number, and arranged in the same manner ; the inter-regional 

 grooves, however, are a little more distinct, and the metabranchial 

 regions, which are situated on each side of the cardiac region, are 

 minutely granular. In the form o£ the front and in their orbits, 

 both species closely resemble each other, so that one description 

 suffices for both ; but the anterior margin of the frontal lobes 

 in this species is widely and more faintly emarginate, so that the 

 external angles are much less prominent and not dentiform 

 as in H. indica. The antero-iateral margins are comparatively 

 much shorter than those of H. indica, so that a transverse line, 

 uniting the fourth antero-lateral teeth divides the upper surface 

 into two portions of very different length, the length of the 

 anterior portion being in proportion to that of the posterior 

 as 1 to 2. The antero-lateral margins are divided into four 

 prominent teeth, including the external orbital angles. The 

 first or anterior tooth is rather small, and much resembles the 

 first antero-lateral tooth of JEL. indica, the external margin being 

 slightly emarginate. The second tooth is a little broader than 

 the first, more prominent and rather obtuse ; the third is the 

 smallest of all, triangular, and much less prominent than the 

 second and the fourth. The last tooth is conical and prominent, 

 granulated above and moderately acute. The margins of the 

 teeth are almost smooth. The inflected sides of the cephalo- 

 thorax are nearly smooth, and only a little granular near the 

 antero-lateral teeth ; they do not present the tubercular eminence 

 or tooth which is so characteristic of H. serratifrons and S. aus- 

 traliensis. 



The outer antennae, the smooth epistome, and the anterior 

 margin of the buccal cavity fully agree with S. indica. As 

 in the latter, the endostome is distinctly ridged on each side. 

 The external maxillipeds closely resemble those of S. indica ; 

 Stimpson's words, " Hectognathopoda sat hiantia," are therefore 

 inexplicable to me, seeing that the external maxillipeds of the 

 species of Seteropanope perfectly resemble those of Pilumnus. 

 The male abdomen is similar to that of S. indica, but the terminal 

 joint is comparatively a little longer. The sternum and abdomen 



