400 



rostrum, lateral corners but little produced, and nearly rectangular. The 3 

 anterior pairs of coxal plates rather narrow, and deeper than the corresponding 

 segments, distal edge minutely crenulated and setous; 1st pair obliquely 

 rounded at the'tip; the 2 succeeding ones obtusely truncated; 4th pair but 

 very slightly emarginated posteriorly, and having the outer part obtusely 

 triangular; 5th and 6th pairs with the posterior lobe rather deep, and narrowly 

 rounded. Epimeral plates of metasome comparatively large, last pair with 

 the lateral corners but very slightly produced. Eyes of moderate size, rounded, 

 pigment dark red; accessory eyes very small, situated about midway between 

 the eyes and the inferior edge of the cephalon. Superior antennae in female 

 exceeding in length V* of the body, 1st joint of the peduncle about the 

 length of the other 2 combined, flagellum considerably longer than the 

 peduncle and very slender, being composed of about 10 articulations, acces- 

 sory appendage fully half the length of the flagellum and 5-articulate. 

 Inferior antennae much longer than the superior, last joint of the peduncle 

 shorter than the penultimate one, flagellum about half the length of the 

 peduncle and 9-articulate. Antennas in male considerably more elongated 

 than in female, the superior one having the 1st joint of the flagellum very 

 large and densely clothed with sensory bristles, the inferior ones with the 

 flagellum exceeding the peduncle in length, and composed of about 15 articu- 

 lations, finely ciliated on the lower edge. Grnathopoda exactly alike in struc- 

 ture, carpus slightly expanded in its proximal part, and gradually tapering 

 distally, propodos not attaining half the length of the former, dactylus very 

 slender, biarticulate. The 2 anterior pairs of pereiopoda unusually short, 

 and but thinly setous, propodal joint very narrow, dactylus small. The 

 3 posterior pairs much stronger, though not much elongated, outer part edged 

 with slender spines, basal joint of last pair much larger than in the preceding 

 pairs, and of rounded form, with the posterior edge considerably curved and 

 quite smooth, meral joint large and broad. Last pair of uropoda considerably 

 projecting beyond the others, rami of equal length, and edged with small 

 spinules and a few slender setae more fully developed in the male. Telson 

 extremely narrow and elongated, gradually tapering distally, cleft extending 

 nearly to the base, terminal lobes acute, and with a few hairs on their 

 outer edge. Colour dark reddish brown. Length of adult female 8 mm., of 

 male 9 mm. 



Remarks. The present form was first detected by Prof. Lilljeborg 

 in the year 1865, and somewhat later in the same year, was described by 

 Goes as a species of the genus Syrrhoe, under the name of S. bicuspis. The 

 Tessarops Jiastata of Norman is undoubtedly also identical with Lilljeborg's 

 species. From the other Syrrhoidce, this form may at once be distinguished 



