1 2 2 



three adult females of which species from the Gulf of Naples are lying before me: it differs 

 at first sight by its much smaller size, for the mediterranean species attains a length of 

 6o mm. Carapace and rostrum closely resemble those of S/c. carinata Olivi. Exactly as in this 

 species the dorsal carina of the carapace is armed with three teeth; these teeth, that are 

 rather low, are equidistant, the distance between the tip of the i^' tooth and the posterior 

 margin is not yet one-third the length of the carapace, the tip of the 2°'^ is situated just in 

 front of the middle and the distance between the tip of the 3''' tooth and the anterior margin 

 of the carapace is one-sixth its length, measured near the dorsal line. The rostrum, slightly 

 ascending, just as much as that of Sic. carinata Olivi, reaches also to the far end of the 2"'^ 

 antennular article and shows exactly the same form; the width of the lateral surface, immediately 

 behind the tooth at the end of the lower margin, is little more than half the width at the 

 base of the rostrum. The upper margin bears in the male 4, in the female 5 teeth; the i''' of 

 the.se teeth that are equidistant, is placed above the anterior margin of the carapace, though 

 the tip projects far beyond it, and nearly as far distant from the tip of the 3''^ tooth on the 

 carapace as the latter from the 2"^*; the i^' rostral tooth is one and a half times as far distant 

 from the 3''^ tooth on the carapace as from the 2°^^ rostral tooth. Unfortunately the extremity 

 of the rostrum and the tips of the 2""^ — 4"' rostral teeth and of the tooth at the end of the 

 lower margin are, in the male, broken off, in the female they are complete and here the tip 

 of the rostrum and the 5"^ tooth of the upper margin are reaching equally far. There is, in 

 the male, a tuft of setae between the tip of the rostrum and the tooth at the far end of the 

 lower margin. The lateral carina that reaches almost to the extremity of the rostrum, appears 

 in the middle, i. e. at the base of the 3''^ rostral tooth, just one and a half as far distant from 

 the upper margin of this tooth as from the lower margin of the rostrum. One or two long 

 setae are implanted on the side of the teeth that stand on the dorsal line of the carapace. 



Orbital angle more obtuse than in Sic. carinata Olivi. Hepatic spine small, situated in 

 a line with the upper margin of the ba.sal joint of the outer antennae. The arcuate groove 

 that defines the gastric region, is quite distinct, the branchiostegal groove, beneath the hepatic 

 spine, well-cut, reaching to the middle of the carapace. The abdomen also resembles that of the 

 mediterranean species. There is a tooth on the i^' tergum, but the carinae of the 2"*^ do not 

 end in a to'oth. Whereas the pleura of the i*' somite bear only one furrow in Sic. parvula 

 de Haan, in Sic. bispinosa de Haan and in the new Sic. rcctirostris, those of Sic. trispinosa 

 are furnished, as in Sic. carinata Olivi, with two transverse furrows. The pleura of 

 the 5"^ and of the 6''* .somite end at their postero-inferior angle in a spiniform tooth. Telson 

 with a pair of small spines near the tip, little shorter than the uropods. 



Eyes large, reaching not yet to the end of i"' antennular article. Antennular peduncle 

 as in Sic. carinata Olivi, but the two spines on the outer margin of i^' article are more 

 slender and the posterior spine is farther distant from the outer margin than in the 

 mediterranean species; 2"<i article one and a half as long as wide and nearly twice as long as 

 the 3'''^ article. Legs of 1*' pair bispinose, fingers longer than the palm, both in this pair and 

 in the 2"'^; the 3''' and the 5* legs are missing. Petasma symmetrical. The lateral margins 

 slightly diverge from the base to just beyond the middle, terminating here in an obtuse tooth ; 



