71 



InnccUh- The first four segments of the pertciui are bent sharply 

 <lo\vn\vards at the sides so that in dorsal view the side plates of 

 the second, third, and fourth are inconspicuous, but those of the 

 tifth and sixth segments are more outstanding-, so that in folding 

 up the animal does not become smooth!}- globular. The first 

 division of the pleon has been described in the account of the 

 genus, apart from notice of a central blunt process which over- 

 hangs the hind margin of the fourth segment. This and thb 

 similar process on the following division seem sl.glitly to vary in 

 relative size_, the former being usually the larger, and both be- 

 coming very prominent in lateral view when the animal is rolled 

 or folded up. The telsonic segment is broad, widening to the 

 insertion of the uropods, thence with convex sides converging to 

 the apical emargination- 



The eyes are large and prominent- their hind margins inserted 

 in the first perxon segment- Their colour (in formaiin) is 

 purplish red. 



The first antenna have the usual geniculate joint, followed by 

 a small second joint, which is longer than broad- The slendei' 

 third joint is longer than the first. The flagcUum of 2.2 joints is 

 longer than the peduncle- It begins with a very short joint, 

 followed by a long one; most of the others carr\- hyaline fila- 

 ments. 



The second antennae have a stout peduncle, the tirst three joints 

 short, the fourth a little shorter than the fifth, which is subequal 

 to the first three combined. The flagellum of 19 joints is longer 

 than that of the first antennae, and in the first 9 joints much 

 stouter, these, in addition to the apical set;e present on all the 

 joints, having on the sides brushes of elongate setcC — probably a 

 masculine feature. 



The epistome is very much longer than tlie upper lip ^\hich it 

 partially embraces with its narrow ends, the elongate trimk having 

 slightly sinuous sides and a rounded top which folds over so as 

 with a more or less pointed return piece to meet the apex of the 

 rostrum. The broad basal joints of the first antenna are yet kept 

 completely apart instead of meeting, as they do in most Sphsero- 

 midffi, at or over the apex of the epistome- 



The upper lip has a broad, not quite s\ inmetrically, bilobcd 

 distal margin, and on the surface a pair of reticulated clear spaces- 

 The lower lip has the hinder angles more squared 

 than is usual in this family. The mandibles 

 are strong, the cutting- plate divided into three 

 hornv-looking teeth, the secondary plate on the left 

 mandible with three horn-coloured teeth, of which the middle one 

 is the smallest, this plate on the right mandible being slighter 

 with the teeth not horn-coloured- The spine-row consists of 

 eight or nine spines closely set, most of them broad. The molar 

 has a rounded crown fringed with teetn and traversed by 

 faintl\- -marked rows of denticles, haviu"- also on the outer side 



