NO 5.] ACCOUNT OF THE SPECIES. 17 



The inferior antennae (see figs. 2 & 4) are a little longer and more 

 slender than the superior, and have the peduncle composed of 4 joints, the 

 last of which is the largest. The flagelluni, as in the superior antennae, is 

 uniarliculate, forming a somewhat flattened, narrow, lanceolate joint, terminating 

 in a straight, slender spine. 



The huccal mass (see figs. 1 & 2) is rather protuberant, and composed of 

 the usual number of oral parts mutually covering each other. 



The anterior lip (see figs. 2 & 5) forms a comparatively small, deeply 

 bilobate flap, covering the masticatory parts of the mandibles, and having 

 the edge quite smooth. 



The posterior lip (fig. 6) is much larger, with the lateral lobes greatly 

 divergent, and each terminating in an oval, somewhat recurved lappet. 



The mandibles (see figs. 2 & 7) are in the form of 2 flattened, almost 

 horizontally arranged pieces meeting in front, below the anterior lip. They 

 do not exhibit any trace of a true molar prominence; but the inner face is 

 rough owing to the presence of numerous small hair-like spinules. The 

 cutting edge is simple, with the upper corner acutely produced, the lower 

 more obtuse, and exhibiting a very small tooth-like projection. On the left 

 mandible, just within the upper corner of the cutting edge, there is an 

 extremely small bidentate prominence, constituting a rudiment of a secondary 

 cutting plate. The palp is well developed, being considerably longer than the 

 body of the mandible, and is composed of 3 well-defined joints. Of these 

 the 1st is rather short, whereas the 2nd is elongated and somewhat com- 

 pressed, exhibiting inside 4 short spiniform bristles, outside in the outer 

 part, several slender setae. The terminal joint is shorter than the 2nd, and 

 conically tapered, with a dehcate ciliation along the inner edge. 



The anterior maxillae (see figs. 2 & 8) exhibit all the chief parts found in 

 typical Amphipoda. The masticatory lobe is densely hairy and divided at 

 the somewhat oblique end into 4 strong teeth. The basal lobe is rather 

 short, and Hkewise densely hairy, but without any true spines or setae. The 

 palp consists of only a single lamellar joint of oblong oval form, and partly 

 covering the masticatory lobe outside. It is edged with short spinules, those 

 on the inner margin being extremely small and densely crowded together. 

 From the outer side of the basal part, moreover, several strong bristles are 

 seen to originate. 



