86 



a little broader than long. In Scyli. sordidits (Stimps.) there is a small tooth just in the middle of 

 the anterior margin of the carapace, immediately behind the antennular segment, and another much 

 stronger tooth occurs on the gastric region; the latter is followed by a third similar tooth just 

 behind the cervical groove. In Scyll. Marteusii the foremost frontal tooth is rudimentary, 

 but the gastric region carries two teeth in the middle line ; both are obtuse and the posterior 

 tooth, measured to the cervical groove, appears twice as long as the anterior; like in Scyll. 

 sordidtis there is also a tooth immediately behind the faint cervical groove. Scyll. Marteusii 

 differs therefore from Stimpson's species by the rudimentary condition of the frontal tooth, 

 while another is observed just in front of the posterior gastric tooth ; this species presents 

 therefore also three teeth in the middle line of the carapace. The upper surface of the latter 

 is covered with a larger number of squamiform prominences than in Scyll. sordidtis^ especially 

 behind the cervical groove and on the regions between the lateral margins and the lateral 

 carinae ; the latter are somewhat more prominent posteriorly than in Stimpson's species. The 

 posterior tooth that overhangs the cervical groove, carries a double row of squamiform 

 prominences, that reach until the intestinal region; this tooth, measured until the transverse 

 groove near the posterior margin, appears twice as long as the posterior tooth of the gastric 

 region. The posterior margin of the carapace is more deeply notched in the middle than that 

 of Scyll. sordidiis. For the rest the upper surface of the carapace nearly resembles that of the 

 last mentioned species. 



The orbits are situated just as near the lateral margin of the carapace as 

 in Scyll. soi'didits^ their diameter is twice as large as their distance from the lateral margin. 

 The posterior, areolated part of the i^' abdominal tergum (fig. 13a) appears longest in the 

 middle line and narrows regularly towards the lateral angles ; it is divided by slightly oblique, 

 longitudinal furrows, 10 or 11 on each side, into as many areolets, that are longer than broad 

 and gradually grow shorter towards the lateral angles ; the smooth, underlying, anterior part 

 of this tergum is apparently smaller than the posterior which is areolated. In Scyll. sordidiis^ 

 on the contrary, the posterior part appears considerably smaller than the anterior and it appears 

 much shorter in the middle line than laterally (PI. II, fig. 1 i cr) ; the longitudinal ribs are all of 

 equal length, except tho^e near the middle, and they are much less conspicuous. Different also 

 from Scyll. sordidiis, the 4 following terga appear distinctly carinate in the middle line. 

 The hardly prominent carina of the s"'^ somite appears bifurcate on its posterior half ("doppel- 

 fadenformige Erhohung" Pfeffer's); the carina on the 3''^^ somite is one and a half as long, 

 much more elevated and appears, examined under a lens, coarsely punctate or indistinctly 

 furrowed in the middle line ; the carina on the 4''^ tergum is less prominent than that of the 

 s""!, the carina of the 5''^ is still less prominent and both these carinae are undivided, like also 

 that of the 3"' somite. 



The abdominal pleura resemble closely those oi Scyll. sordidiis (Stimps.): the pleura 

 of the 2"^\ 3'J and 4'ii somites are obtusely pointed, the 5''^ are rounded. Also as regards the 

 sculpture and areolation of the 2"'' — 5"^ terga and pleura, both species closely agree with 

 one another, the form and the number of the squamiform prominences are 

 even quite similar; only, when the egg-bearing female from .Stat. 33 is compared with 



