9 o 



General distribution: Japan, Kagoshima (Ortmann) ; Mulaku, Kolumadulu, Mah- 

 losmadulu and South Nilandu (Maldives and Laccadives) (Borradaile); Singapore (Nobili) ; 

 Zanzibar (Nobili). 



7. Scyllarus gibberosus (de Man). (PI. III, Fig. 14 — \\d). 



Arctus gibberosus J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. IX, 1905, p. 588. 



Stat. 99. June 28/29/30. 6°f.c, N., I20°26'E. Anchorage oft" North-Ubian. 16 — 23 m. Litho- 



thamnion-bottom. 1 young male. 



Stat. 164. August 20. i°42'.5 S., I30°47'.5 E. 32 m. Bottom : sand, small stones and shells. 



1 young male. 



Closely related, especially as regards its thoracic legs, to Scyll. sordidus (Stimps.). 



The whole length of the male from Stat. 1 64, which was collected together with specimens 

 of Scyll. Martensii in the sea between the islands of Salawatti and Misool, from the anterior 

 edge of the outer antennae to the end of the telson measures 21 mm.; the carapace, measured 

 in the middle line and the antennular segment included, is 6,8 mm. long, the abdomen 1 1 mm. 

 and the distance between the antero-lateral angles of the carapace measures 7 mm. Immediately 

 behind the anterior margin the carapace carries in the middle line a tooth and another, somewhat 

 larger, is situated on the middle of the gastric region ; looked at from above, both appear 

 rather obtuse, in a lateral view they appear moderately sharp. Between these two teeth, 

 which occur also in Scyll. sordidus, this new species carries, however, still a third, which is 

 wanting in Stimpson's Scyll. sordidus: looked at from above this tooth appears broadly 

 rounded anteriorly and also in a lateral view it appears rather obtuse. While one observes 

 in Scyll. sordidus, immediately behind the cervical groove, a single strong tooth, situated higher 

 than those before it, Scyll. gibberosus carries here a coup Ie of two very small and 

 obtuse teeth, situated closely abreast and on a lower level than the gastric tooth, nearly 

 as in Scyll. bicuspidatus. The three teeth ! n front of the quite distinct, cervical groove are 

 covered with squamiform tubercles; they exist also, in two rows, between the couple of small 

 teeth just described and the transverse furrow that separates the intestinal region from the 

 posterior border; small prominences exist on the sides of the gastric region, somewhat larger 

 ones on those of the cardiac. The squamiform prominences on the intestinal region are larger 

 than those on the posterior border; the notch in the middle of the latter is as shallow as in 

 Scyll. sordidus. The lateral carinae resemble those of this species, presenting two teeth on the 

 inner side of the orbits and one just behind the interruption of the cervical groove, but behind 

 the latter the carinae are more obvious, because the large squamiform prominences, with which 

 they are covered, are distin ctly carinate. In Scyll. sordidus the antero-lateral angles of the 

 carapace reach as far or farther forward than the antennular segment, but in Scyll. gibberosus 

 the latter reaches farther forward than the antero-lateral angles. The inner surface of the 

 anterior, orbital part of the lateral carinae is covered with small, squamiform prominences, that 

 are here more distinct than in Scyll. sordidus. The lateral margins which present two incisions as 

 in this species, are furnished with squamiform prominences and the hepatic and branchial 

 regio ns are closely covered with them; they are comparatively fewer in number 



