8? 



the somewhat larger female of Scy//. sordidus from Stat. 162, the squamiform prominences 

 appear more prominent and are therefore more con s pi en on s in Pkkffer's species. In 

 both species they are fringed with very short, stiff" setae, that occupy the grooves and furrows 

 between them. The 6'^ somite shows also the same form and sculpture in both species, but 

 the posterior margin is straight in the middle, whereas it forms in Scy//. sordidns a rounded 

 prominence in the middle line. The caudal fan has also the same form in both species, but 

 the sculpture of the telson is much more conspicuous in Scy 1 1. Martcnsii. 



As regards the relative length of the terminal joint of the antennular peduncle in 

 proportion to the penultimate, this .species agrees with Scyll. sordldus^ their form is also 

 the same. 



The 4''^ joint or pro.ximal (outer) squame of the external antennae is but little longer 

 than broad, nearly as in Scyll. sordidns. Its outer margin is armed with four teeth, of 

 whicli the P' and the 4"' are smaller, less conspicuous than the two situated in the middle. 

 The inner margin appears serrate al<jng its whole length by seven or eight teeth, that 

 somewhat decrease in size towards the ti]); the distal or anterior margin of the upper 

 surface of these teeth is notched at some distance from their apex, so that each presents a 

 small secondary tooth at the base of their anterior margin. This character has also been 

 observed by Borradailk (1. c). The upper surface of this joint is traversed by a moderately 

 prominent, longitudinal ridge, which in a lateral view ajipears to be smooth and entire, but 

 which, looked at from above, seems to be formed bv a row of triantrular teeth or scales, that 

 are covering one another like tiles. A few small, acute tubercles are observed on the upper 

 surface between this ridge and the teeth of the inner margin and a renv of acute i^rominences 

 occurs at the base of the teeth of the outer margin, of which the first is the largest and looks 

 like a short ridge. The distal s([uame, which is somewhat granular above, has its anterior 

 margin deeply cut into five teeth; the P' or external tooth is almost as broad as 

 the two following taken together and its truncate, anterior margin appears slightly 

 concave. I he 4 following become gradualh' narrower and, while the 2"'', 3"' and 4''' are obtusely 

 pointed, the 5''' appears rather acute; a small acute tooth occurs moreover on the inner border 

 and a trace of another behind it, so that the distal squame jjresents seven teeth. All these 

 teeth appear finely crenulate, under a lens, on their outer border, owning to the insertion of 

 the plumose setae. 



The sternum (PI. Ill, fig. 13) (jf the egg-bearing female from Slat. 33 appears, when 

 measured in the middle line, to l)e S mm. long; it is 6'/., mm. broad at its Ijase, being but little 

 longer than broad. 'J'lu; anterior extremity is truncate, though somewhat concave; it shows 

 a minute notch in the niidilk; line aiul another on each side of it, so that one observes, on 

 each side ot tlu' middle line, a small rounded prominence. The !■"' joint of the sternum presents 

 a triangular concavit)-, almost as in Scyll. /laaiiii Berthold; from each anterolateral angle runs 

 a short ridge backwards and inwards and both ridges meet one another in the middle line. 

 The sternum is more concave than that of Scyll. soi'didiis\ a transverse row of small, 

 fiattened granules occurs near the anterior margin of the 2'"' joint and the u|)Standing sides 

 ol the sternum are covered with similar flattened granules; on the 3 following joints 



