233 



strongly expanded distally, inferior and anterior edges forming together a 

 perfectly even curve; 4th pair still larger, twice as deep as the corresponding 

 segment, inferior and posterior edges evenly curved, posterior excavation 

 defined below by a nearly right angle; 5th pair rather small, and somewhat 

 oblique, nearly twice as broad as they are deep, posterior lobe the deeper. Last 

 pair of epimeral plates of metasome somewhat produced at the lateral 

 corners, but without any dentiform projection. Last segment of urosome 

 excavated dorsally, the excavation being defined by 2 longitudinal parallel 

 ridges, each tei'minating in a projecting, tooth-like process. Eyes extremely 

 small, rounded, each with only 3 imj^erfectly-developed visual elements, 

 pigment red, with a whitish coating. Superior antennse rather small, 1st 

 joint of the peduncle about the length of the other 2 combined, flagellum 

 shorter than the peduncle, and composed of 5 articulations, the 1st of which 

 nearly equals in length the remaining part of the flagellum, all being 

 provided with long band-like sensory appendages. Inferior antennae some- 

 what longer than the superior, and much more slender, last joint of the 

 peduncle fully twice the length of the penultimate one, flagellum nearly as 

 long as the peduncle, and composed of 4 articu.lations, the 1st of which 

 equals in length the other 3 combined. Gnathopoda almost exactly alike, 

 both as to size and structure, the posterior ones being only a little more 

 slender, propodos in both pairs very narrow, and scarcely longer than the 

 2 preceding joints combined, palm not distinctly defined, its edge minutely 

 ciliated, and having besides on the anterior pair 2, on the posterior a single 

 small denticle, dactylus slender and finely spinulose on the inner edge, 

 carpus produced at the end inferiorly to a rather short setiferou.s lobe. 

 Anterior pairs of perieopoda considerably more elongated than the posterior, 

 and very slender. Basal joint of the penultimate pair oval in form, posterior 

 edge deeply sinuated below the middle, that of the last pair somewhat 

 larger, and forming inferiorly a broad deflexed lobe emarginated at the tip. 

 Last pair of uropoda much larger than the penultimate pair, and reaching 

 nearly as far back as the 1st pair, basal part large and somewhat 

 laminar, rami narrow lanceolate and quite naked. Telson conically triangular 

 and flattened, reaching about to the end of the basal part of the last pair 

 of uropoda, but generally quite concealed in the lateral aspect of the animal. 

 Colour uniformly greyish white, without any pigmentation. Length of 

 adult female scarcely exeeding 2 mm. 



Eemarks. — This is the only as yet known species of the genus, and 

 may easily be distinguished from any of the other northern Amphilochidge 

 by the strongly projecting rostrum and the enormous development of the 

 3rd and 4th pairs of coxal plates. 



