8i 



faint cervical groove one observes two minute, sharp teeth, situated close abreast. Immediately 

 behind the cervical groove are two similar acute teeth, situated also quite close to one 

 another and a little larger than the anterior pair; the posterior pair of teeth are situated 

 on a lower level than the acute tooth of the gastric region. In Srr//. Martensii^ on the 

 contrary, there are three rather obtuse teeth on the middle line of the carapace, two on the 

 eastric resrion and one, immediatelv behind the cervical groove, situated on a higher level than 

 the two others; the frontal tooth is rudimentary. Scyll. bicuspidatus resembles therefore, as 

 regards these median teeth, Scvll . Ilaanii Berthold, but the frontal and the gastric tooth are 

 directed horizontal!)' forward, while in this new species they are slightly turned upward. Between 

 the acute gastric tooth and the groove in front of the posterior border, the carapace is covered, 

 in the middle, with some flattened, scjuamiform prominences, but they are hardly recognizable, 

 even under a lens. ( )n each side of the middle the gastric region carries 5 or 6 squamiform 

 prominences and one single, more dentiform prominence occurs on each side of the posterior 

 pair of small teeth, just behind the cervical groove. The lateral carinae are interrupted a little 

 behind the orbits, as in Scxll. Mar/ai.<ii\ the interruption is in a line with the anterior pair of 

 minute teeth on the gastric region. The anterior part of the lateral carinae carries, at the inner 

 angle of the orbits, two acute teeth behind one another, squamiform prominences are barely 

 recognizable on it; there is a small obtuse tooth just behind the interruption and the hardly 

 salient, posterior part of the lateral carinae is covered with a double row^ of rather large and 

 distinct, squamiform prominences. 



The orbits, a little broader than long, are situated about as close by the lateral 

 margin of the carapace as in Scy/I. Marlciisii : the width of the orbits, 1,4 mm., is a little 

 more than twice as large as their distance, 0,6 mm., from the lateral margin. 



The lateral margins of the carapace, that present two small incisions, resemble those 

 of Scyll. Martcnsii; the distance between the two incisions is a little shorter than that between 

 the anterior incision and the antero-lateral angle of the carapace. The acute antero-lateral 

 angles, which are directed slightl\- outward, reach as far forward as the antennular segment; 

 the lateral margins carry 3 or 4 sharp squamiform prominences between their anterior e.xtreniity 

 and the first incision, two or three between the two incisions and seven or eight behind the 

 posterior one; all are rather large and conspicuous. A few small ones e.\ist just behind the 

 orbits, but for the rest the hepatic and branchial regions are smooth, while they are covered 

 in Scyll. Martensii, almost everywhere, with similar prominences. The transverse intestinal region 

 is separated by a deep groove from the posterior border and both are covered with scjuamiform 

 prominences, which on the intestinal region are a little larger than on the jjosterior border; the 

 median notch of the latter is shallow, less deep than in Scyll. Martoisii. E.xcept on the 

 squamiform prominences ami on the inner side of the anterior part of the lateral carinae, the 

 upper surface of the carapace is covered with a short jjubescence. In Scyll. Martcnsit the 

 upper surface of the carapace bears a much larger number of S(iuamiform prominences that 

 are much more conspicuous and the lateral carinae are posteriorly much more prominent. 



The antennular segment is twice as broad as long; it is deeply notched anteriorly 

 in the middle and each half carries anteriorly in the middle a tooth which is distinctly carinate 



SIIIOGA-K.XI'EDITIIC XXXIX a- '■ 



