88 



with numerous setse ; the lobe is produced forwards and outwards, constituting a thick, obhque- 

 triangular plate directed forwards and outwards, and its end is produced into a spine-shaped 

 process going essentially forwards but not reaching the end of second joint near its outer angle; 

 from the base of this process to the inner base of the lobe the surface bears a very oblique 

 row of lo — 12 slender, long spines, the outer of which is directed forwards, the inner besides 

 a little inwards. Second joint of the peduncle distally along the inner three-fourths of its breadth 

 produced into a flat, moderately short lobe, the outer terminal angle of which bears a spine- 

 shaped process directed forwards and a little outwards and reaching the middle of the next joint; 

 third joint towards the end of the inner part of its upper surface with a high keel. The antennal 

 squama is broad and reaches about the middle of third antennular joint. Third abdominal segment 

 dorsally produced into a moderately short, spine-shaped, thin process; fourth and fifth segments 

 dorsally either with a feebly produced, sharp angle or with a very short, acute tooth at the 

 middle of the hind margin. Telson with lo — 12 pairs of small dorsal spines; uropods with the 

 exopod just reaching the end of telson and a little longer than the endopod. 



Length about 23.5 — 25 mm.; adult specimens unknown. 



Very young Specimens. — A specimen (from Stat. 66), which measures 9.5 mm., 

 differs in several particulars from subadult specimens. The frontal plate (fig. 3^) has still preserved 

 much of the shape in the larva (comp. fig. ^^tf), being distinctly longer and beyond the middle 

 considerably broader than in the subadult, with the distal part of the lateral margins considerably 

 convex and the rostrum small, triangular, shorter than in the larva, acute, not compressed; the 

 upper surface of the frontal plate is deeply concave longitudinally, with the carina from the 

 carapace terminating somewhat behind the rostrum. The carapace with the lateral linear furrow 

 and the marginal denticle well developed, while the anterior submedian dorsal keels are wanting. 

 The eyes (fig. t,c) are proportionately very large, black, semiglobular. The antennular peduncles 

 have the lobe from first joint somewhat developed, but its distal spiniform process is still rather 

 short and the oblique dorsal row of spines not developed; the lobe from second peduncular 

 joint is not developed, but its terminal process is conspicuous, and the upper keel on third 

 joint is high. The dorsal spine on third abdominal segment is conspicuous but short, while no 

 tooth is found on the two next segments. In other respects, as uropods and telson, the specimen 

 is essentially as the subadult. 



Larvje. — 4 of the larvce from Stat. 276 are in the same stage of development (the 

 others are a little more developed); one of these smaller specimens, of which four figures (figs. 

 0^—3^) are given, measures 4.7 mm. in length. The frontal plate (fig. 3^/) is long, moderately 

 broad to somewhat before the end, then it tapers rapidlj' and terminates in an acuminate, short 

 rostrum; its major posterior part is deeply concave longitudinally, and its anterior part is bent 

 somewhat downwards, while the rostrum itself is horizontal or turned slightly upwards ; the carina 

 from the carapace reaches .scarcely the middle of the frontal plate, and the more protuberant 

 posterior part of this carina is a little higher and with the anterior margin more vertical than 

 in the subadult specimens. The carapace without the sublateral furrow, but with the marginal 

 denticle very conspicuous though not large. The eyes are extremely large, semiglobular, dark 

 greyish or nearly black in the central part. The antennuke only half developed (fig. 3^/); the 



