708 CRUSTACEA. 



sponding to the usual molar prominence of this division of Crustacea, 

 is stouter, a little reflexed, with a truncate apex, and short hairs or 

 spinules just below the apex. The exact character of its surface was 

 not observed. The maxillae are nearly as usual (see figures) ; the 

 maxillipeds have five joints, and the two are in close contact along 

 the medial line. The first or basal joint is very short, and projecting 

 laterally, but diminishing nearly to a point; it bears a triangular 

 lamella or palpus ; the second joint is oblong, and has its inner apex 

 lamellarly prolonged; the third is short; the fourth and fifth together 

 elliptical in outline. The outline of the whole pair is nearly an equi- 

 lateral triangle. The mandibles are to a great extent visible in an 

 under view, just exterior to the maxillipeds. 



The first and second pairs of abdominal appendages are furnished 

 with very long plumose seta?, and the second bears from the base of 

 the inner plate, a slender spiculiform process, as long as the rest of the 

 organ, obtuse at apex. These two pairs are attached to the free ab- 

 dominal segments. The outer pair has a small oval plate inside, 

 attached at the articulation. 



Cleantis linearis. 



Angusto-linearis, fronte truncato, parce excavato, capite parce trans- 

 verso, per segmentum proximum partim amplexo. Oculi mediocres, reni- 

 formes, remotl. Segmenta thoracis paulo transversa. Abdomen o-arti- 

 cidatitm, segmentis duobus brevissimd transversis ; tertio valde oblongo, 

 prope basin suturd notato, lateribas fere parallelis, angulis posticis 

 truncatis, apice truncato aut obsolete excavato. Antennae interna? par- 

 vulce, dimidio externarum valde breviores. Antennae externce crassius- 

 culae, articulo ultimo breviore quam precedens, longe ovato, pubescente. 

 Pedes tertii primis duplo longiores. 



Very narrow linear, front truncate or a little excavate, eyes situated 

 near its angles. Head subtriangular behind and obtuse, being set 

 into the following segment. Thoracic segments somewhat trans- 

 verse. Abdomen three-jointed, first two segments very short trans- 

 verse, the third twice as long as broad, having a suture near base, 

 sides nearly parallel, posterior angles truncate, apex truncate or 

 slightly excavate. Inner antennae very small, not half the length 



