:5/ 



Glvptjdotea lichtensteinit, Kraiiss. 



Plate io. 



i843. Idotea lichtensteinii, Kraiiss, Die siklafrikanischen Crus- 



taceen, p. 62, pi. 4, fig. 4- 

 1881. Idotea Licktenstiinii, JNiiers, Jouni. Linn- Soc. London, 



vol. 16, p. 64- 



The front of the head is trisinuate, the median notch small and 

 overhung by a large, blunt-cuded, horizontal process of the dorsal 

 carina, the lateral angles produced into blunt points directed 

 slightly outwards in advance of the small black, dorso-lateral,. 

 triangularly-rounded eyes, behind which the lateral margins con- 

 verge to the faintly-concave hind border. The first peraeon seg- 

 ment is short in the middle,but with the sides redchii 1 g tor v\ ardl o 

 the eyes, lianking the head with broadly rounded plates, of which, 

 however, the inner and the hinder margins are flattened. Of the 

 six following segments the side-plates are a 1 distinct in shape 

 passing from oval to sub-quadrate, not produced backward, but 

 matching the length of the segment, which is least in the seventh. 

 andgreatestinthesecondandthird,thelatterwithiibb i.e piatt > 

 presenting the greatest breadth. The pleon has a length equal 

 to the first three segments of tht pcraeon, the breadth at the base 

 being not much less than the length, and nearly two and a half 

 times the width of the apex, which is shallowly emc^rginate with 

 rounded corners- The three pairs of sutures are dorsally succes- 

 sively shorter ; ventrally they are very distinct. A nJ,edian carina, 

 extends from the cephalic process on to the pleon, where it loses 

 the rather moderate aciitcne^s of its earlier portion, and near the 

 iniddle of the segment bifurcates, being very faintly continued to- 

 each apical angle- 

 First antennae — The first joint is deeply cut into several un- 

 equal lobes, among which is implanted the narrow stalk of the 

 second joint ; this in turn is divided into lobes at its widened' 

 distal extremity, receiving the shorter third joint, which also 

 forms a little cup for the narrow base of the flagellum. The latter 

 has the shape of a bladebont-, and has its convex miargin cbsely 

 set with fourteen semi-circular lobes, from each of which projects- 

 a pair of hyaline sensory filaments and two setules, or perhaps 

 from the last two semi-circles there may be only one filament 

 apiece. It is possible that these maginal divisions with their 

 apparatus indicate a coalescence of many articulations to form 

 this peculiarly shaped one-jointed flagellum- 



Second antennae — The first joint short; the second much wider, 

 cut into deep lobes which encircle the third joint, this also being 

 wide and lobed. but less strongly than the preceding, the fourth 

 joint oblong, a little longer than wide, the fifth abruptly narrower^ 

 considerablv longer ; the flagellum longer than the peduncle, con- 



