REPORT ON THE SCHIZOPODA. 139 



more powerful than in the female. The outer flagellum more especially is distinguished 

 by a very thick, and, as it were, swollen base. 



The antennal scale (fig. 4) projects but slightly beyond the second joint of the 

 antennular peduncle, and exhibits a regular oblong-linear form, its length being about 

 four times greater than its breadth. The apex is obliquely truncate, with the inner 

 corner projecting, the outer jutting out as a small denticle. Of the flagellum, here too 

 the outer part was broken oflf in all the specimens ; its peduncle is exceedingly slender 

 and projects far beyond the scale, with the middle joint very elongate, nearly three times 

 as long as the terminal. 



The anterior lip (see fig. 5) exhibits the usual galeate form, but would seem to be 

 relatively somewhat smaller than in other Euphausiidse. 



The posterior lip (fig. 6) has the terminal lobes somewhat rounded, without a 

 distinctly marked outer angle. 



The mandibles (see fig. 5) are eminently distinguished by the total absence of the 

 palp. Their masticatory parts (fig. 7) appear a trifle less strongly expanded than in 

 most other Euphausiida3, but with the cutting edges divided in the usual manner into 

 several acute teeth, having likewise posteriorly a well-marked molar protuberance. 



The first pair- of maxillaj (fig. 8) do not exhibit any trace of the usual lamellar 

 exognath, but for the rest would seem to be of normal appearance, except that both of 

 the masticatory lobes have a comparatively small number of setae and spines. The 

 terminal joint is lamelliform, oval, and, as usual, provided along the inner edge with 

 a double row of bristles. 



The second pair- of maxillte (fig. 9) are rather small and membranous throughout, 

 exhibiting, on the whole, a less perfect development than in other Euphausiidse. The 

 masticatory lobes are only two in number and project but very little, forming merely 

 slight expansions of the inner edge of the basal part, fringed vdih a single row of slender 

 ciliated bristles. Of the lobes, the inner one is l)y far the shorter, and has only five 

 bristles. The terminal joint is very short, appearing as a mere direct continuation of the 

 basal part, though separated by a distinct transverse suture ; it is furnished with three 

 bristles only, springing from the inner edge. The exognath forms a slight expansion of 

 the outer edge of the basal part, and is fringed with about nine plumose setae, increasing 

 in length anteriorly. 



The maxillipeds (fig. 10) have the stem, or endopodite, comparatively small, reaching 

 but very little beyond the basal part of the antennae, and rapidly tapering toward the 

 apex, the outer part being very slender. The masticatory process, issuing from the coxal 

 joint, is conically produced, and bears at the tip three diverging setae. The basal joint 

 is rather broad and compressed, and also the ischial joint is decidedly laminar, though 

 considerably narrower, both furnished along the inner edge with very short bristles. The 

 meral joint is somewhat longer than the ischial, but very much narrower, and has like- 



