§7 



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

 appear more prominent and are therefore more conspicuous in Pfeffer's species. In 

 both species they are fringed vvith very short, stift setae, that occupy the grooves and furrows 

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

 the posterior margin is straight in the middle, whereas it forms in Scyll. sordidus 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 Scyll. Martcnsii. 



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

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

 the same. 



The 4 th joint or proximal (outer) squame of the external antennae is but little longer 

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

 which the i st and the 4" 1 are smaller, less conspicuous than the two situated in the middle. 

 The inner margin appears serrate along its whole length by se ven or eight teeth, that 

 somewhat decrease in size towards the tip ; the distal or antenor 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 Borradaile (1. c). The upper surface of this joint is traversed by a moderately 

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

 which, looked at from above, seems to be formed by a row of triangular 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 row of acute prominences 

 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 squame, which is somewhat granular above, has its anterior 

 margin deeply cut into five teeth; the i st or external tooth is almost as broad as 

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

 concave. The 4 following become gradually narrower and, while the 2 nd , 3 rd and 4 th are obtusely 

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

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

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

 the plumose setae. 



The sternum (PI. III, fig. 13) of the egg-bearing female from Stat. 33 appears, when 

 measured in the middle line, to be 8 mm. long; it is ó 1 ^ mm. broad at its base, being but little 

 longer than broad. The anterior extremity is truncate, though somewhat concave; it shows 

 a minute notch in the middle line and another on each side of it, so that one observes, on 

 each side of the middle line, a small rounded prominence. The i st joint of the sternum presents 

 a triangular concavity, almost as in Scyll. Haanii Berthold; from each antero-lateral 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. sordidus ; a transverse row of small, 

 flattened granules occurs near the anterior margin of the 2 nd joint and the upstanding sides 

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



