KONGL. SV. VET. AKADEM1ENS HANDL1NGAR. BAND. 21. N:0 5. 11 



The first joint of the flagellum is very elongated, prismatic, tapering towards the end, and 

 bordered by three denticulated keels, the teeth very long; the inner side is fringed with 

 long olfactory hairs, more densely in the male than in the female. The olfactory hairs are 

 placed in transversal rows along two thirds of the length of the joint, 12 to 6 in each 

 row, the number decreasing from the base towards the end. The number of such trans- 

 versal rows is 60 — 70. The rest of the flagellum consists of only one joint scarcely 

 equalling a twelfth of the length of the first joint; it is conical, without hairs or serra- 

 tions; the integument seems to be much thinner and softer than in the first joint. The 

 flagellum is more than eight times longer than the peduncle. In the male the whole an- 

 tenna reaches to the anterior margin of the second pleonal segment, in the female to the 

 anterior margin of the urus; in young animals it is shorter. 



The second pair of antenna; (PI. II, fig. 2 — 5) in the male are, when stretched out, 

 much longer than the first pair. The peduncle is three-jointed, the first joint short and 

 stout, scarcely .longer than broad, provided with some minute hairs at the lower anterior 

 corner, the second is twice as long as the first, narrower; the third joint is more than 

 twice as long as the second; both are fringed with minute hairs along the inferior margin. 

 The third joint is broader at the outer end, where it articulates with the flagellum. The joints 

 of the peduncle are capable of an almost rectangular articulation against one another; the 

 first joint of the flagellum can be folded up along the third peduncular joint and the rest 

 of the flagellum in the same manner against the first flagellar joint. The whole flagellum 

 is filiform; the first joint, the longest, is a little shorter than the last peduncular joint, 

 broader at both ends; the following joints, 8 — 10 in number, are elongated, the last one 

 a little longer than the others, rounded at the tip and carrying along its whole length a 

 row of long thick glandular hairs or slender sacks; the preceding joints are fringed 

 with short hairs and some few short ovate sacks, filled with some glandular matter. In 

 young males the flagellar joints are very short (PI. II, fig. 4 and 5). In the female the 

 peduncle consists of two short joints tipped with two or three minute articuli, totally smooth. 



The labrum (PL I, fig. 6) is broad, the lower margin, being incised in the middle, 

 forms two broadly rounded lobes. 



The mandibles (PI. I, fig. 7 and 8) are long, the free end very sharp, slightly 

 Crenulated, the inner corner projects into a sharp point. 



The Jirst pair of maxillce (PI. I, fig. 9) are well developed; they consist of a strong 

 basal portion and two lobes; the inner lobe is strongly serrated at the apex, finely hirsute 

 at the stem; the outer lobe is smooth with a small denticle at the lower inner corner; 

 at the base of the inner lobe there is a short and thick, hirsute, appendicular lobe. 



' The second pair of maxillw (PL I, fig. 10) consist of a rounded basal portion and two 

 short, densely hirsute lobes, excavated at the ends, and pointed at the corners. 



The maxillipeds (PL I, fig. 11) consist of a large basal portion and a median robust 

 process, the hoinologon of the terminal joints of the lobes of the two maxillipeds in the 

 Gaminarids. At the anterior corners rise two double laminse, the homologa of the palps 

 of the maxillipeds. The inner margins of the laminse carry some short hairs. 



The pereion is a little longer and broader in the female than in the male. The 

 first four segments are somewhat higher than the three following, and considerably 



