275 



the length of the rest of the carapace, and reaches to the middle of the eyes; it is dorsally 

 hollowed, the lateral borders converge from the base to a little beyond the middle and diverge 

 thereupon slightly to the anterior margin, which is straight, truncate with rounded lateral 

 angles. The rostrum is o, i6 mm. broad in the middle and immediately behind the anterior 

 margin 0,19 mm., the latter being one- third the length, while the rostrum proves to be 

 3,75-times as long as wide in the middle. The lateral margins of the rostrum and the orbital 

 margin are glabrous, not hairy. The orbital margin from the antero-external angle of the rostrum 

 to the orbital spine appears semi-circular, so that the very small, orbital spine reaches to the 

 middle of the eyes, almost as far forward as the rostrum. Antennal spine strong, reaching beyond 

 the level of the eyes, slightly divergent and buttressed by a long, sharp carina. From the orbital 

 margin, from a point situated a little farther distant from the rostrum than from the orbital 

 spine, a shallow groove runs at first obliquely outward and backward and then curves towards 

 the uppermost of the three spines on the side of the carapace; this groove is bounded at the 

 inner side by a ridge, so that the surface of the carapace at the inner side of this ridge is situated 

 at a somewhat higher level than outside of it. A much finer suture runs from just outside the 

 orbital spine backward to near the upper of the three lateral spines of the carapace. There is 

 no minute spine close to and just below the antennal spine as occurs in Pofit. Keinpii and 

 other species. At nearly one-si.\th its length from the base of the rostrum the carapace bears 

 one well-developed, acute spine, directed forward and slightly upward ; from this spine a short 

 rounded carina runs backward, that already disappears before the middle of the carapace, while 

 the rest of the latter is rounded. Midway between this spine and the rostrum a rather deep 

 furrow runs transversely across the carapace. As already remarked, the carapace is armed at 

 either side with three spines. The i^' or uppermost is situated posterior to the orbital spine, 

 just behind the level of the dorsal spine, and buttressed by an obtuse carina, which in a lateral 

 view of the carapace runs backward and slightly downward ; it is a little smaller than the dorsal 

 spine. The 2'"^ or hepatic spine, as large as the dorsal, is placed a little in advance of it, on 

 a level with the carinated antennal spine; the hepatic spine is not carinated and half as far 

 distant from the i*' as the i*' from the dorsal spine. The 3''^ spine, finally, as large as the 

 hepatic, is placed midway between the latter and the antennal spine, at a slightly lower level, 

 immediately behind the antennal crest. From the antennal spine a shallow groove runs backward 

 and curves toward the hepatic spine, which is also separated from the 3''<^ spineT by a groove. 

 A few hairs occur on the branchial region and just below the third and the antennal spine. 



Abdomen 3-times as long as carapace, rostrum included ; it is perfectly smooth, neither 

 sculptured nor carinated. Anterior and posterior margins of the pleura rounded or obtuse; 

 posterior margin of 3'^' tergum transverse, not projecting at all. Si.xth somite 3,1 mm. long, 

 one and a half as long as the s'*^, 4, 3-times as long as thick in the middle, not grooved above; 

 the outer angles of the posterior margin terminate each in a very small spine, 0,06 mm. long, 

 the only spines that one ob.serves on the abdomen. Telson 3,75 mm. long, a little longer than 

 the 6''' somite, strongly tapering, flattened above; there are two pairs of dorso-lateral spinules, 

 long 0,12 mm., the anterior pair just behind the middle, the other at the posterior fifth; the 

 width, 0,22 mm., of the tip is one-third the width of the base of the telson, the tip (Fig. 65 f) 



