964 1)H. H. J. HANSEN ON C'llUSTACEA^S [DoC. 1, 



To his description it may be .idded that each of the four anterior 

 abdominal segmenis possesses in the median line on the inferior 

 side a protuberance or lobe, the three anterior of these ending in 

 a spine ; on the ext. br. of iirp. the exterior margin is ciliated in 

 # of its length, thus a very short basal part being naked, but no 

 tooth or spine is present. 



S. v'ujllax, Stimps. — The description of Stimpson (p. 45) agrees 

 rather well with the oldest Misligojnis, and no other species 

 known to me agrees with it ; his animals were captured at the 

 Azores. Specimens c. 9-16 mm. in length are distinguished from 

 the related forms by the following characters : — The rostrum about 

 as in S. ocidatus, Kr., but perhaps a little larger, directed upwards 

 and forwards ; in specimens 9-10 mm. in length the apex is 

 produced into a short spine directed forwards. The eye-stalks are 

 very long, obviously longer than in S. oeidaUis, Kr. ; the eyes large. 

 In the antenn. ped. the first a,nd third joints are of about equal 

 length. The abdominal segments are dorsally smooth, yet in s|)eci- 

 mens 9-10 mm. long with very short spines or traces of spines on 

 the fourth, fifth, and sixth segments. On the ext. br. of urp. the 

 ciliated part occupies from | (in the younger specnnens) to more 

 than ^ (in the older specimens) of the exterior margin, hut the 

 spine is generally obsolete. The adult form is described above, 

 bearing tlie same name. — As already pointed out by Ortraann, 

 S. pamideivs. Bate (p. 409, pi. Ixxiv. fig. 3), 9 mm. long, is estab- 

 lished on younger specimens of S. vigilax, with dorsal spines on 

 the fourth to sixth abdominal i^egments. Bate's figure gives a 

 rather good idea of this stage. S. mncrophthalmus, Stimps. (p. 46), 

 is, in all probability, identical with the stage parvidens. Bate. 



The smallest specimen seen by me (captured by Chun at the 

 Canaries) is (the rostrum included) 4 mm. long, and diifers con- 

 siderably in several particulara from the older specimens, but is 

 more similar to B. hracliyorrhos, Kr. The rostrum is about | as 

 long as the eye-stalks, its short basal part broad, and at its end a 

 dorsal spine, beyond which the rostrum is very slender. The 

 supraocular and the hepatic spines are considerably elongated. The 

 antenn. ped. extremely slender, only 2-iointed, as the second joint 

 is not yet separated from the first ; the third is not 5 of the entire 

 peduncle. The posterior margin of the carapace in the median 

 line with a slender spine directed obliquely forwards (this spine 

 is still preserved in specimens c. 8 mm. long, but then shorter and 

 almost perpendicular). Each of the 6. abdominal segments with a 

 dorsal spine, which is short and perjiendicular on the first two 

 segments, longer on the third, fifth, and sixth, very long on the 

 fourth segment. The epimera of the 5 anterior segments produced 

 into a short spine directed outwards ; the same segments besides 

 inferiorly in the median line with a lobe, which at least on the 

 second segment is armed with a spine. The very narrow ext. br. 

 of urp. with the exterior margin ciliated in scarcely more than j 

 of its length, and the spine is well developed. The telson very 

 short as in S. bntchyorrhos, Kr. 



