416 CARL BOVALLIUS, AMPUIPODA HyPKKlJDEA. I. 2, ANCHYLOMKUID^. 



Auchylomera BtosseviUei. 



The Ji:rst ■pair of antennw (Pl. XVII, fig. 4) are fixed at the iniddle of the front 

 side of the head, and, in the adult male, reach to the niiddle of the third pleonal seg- 

 ment. The first joint of the peduncle is very thick and large, broader than long, and 

 more than twice as long as the two following joints together. The first joint of the 

 flagelliim is more than twice as long as the Avhole peduncle, and is thick and tumid; its 

 lovver front corner is produced into a blunt process; the inner and under sides of the 

 joint are densely set with long olfactory hairs. The following joints are slender, cylin- 

 drical, about twice as long as broad. In the adult male the flagellar joints are more than 

 fifty in number. In the 3'oung male the first pair are short and stout, and comparatively 

 much thicker than in the adult male. 



The seeond pair of antenna: (Pl. XVII, fig. 1) are longer than the first, and reach 

 to about the hind margin of the first ural segment. The first free joint of the peduncle 

 is longer than broad, the seeond is shorter than the first, the third is a little longer. 

 The first joint of the flagellum is a trifle longer than the last peduncular joint; the 

 following are shorter, slender, cylindrical, with a few minute hairs on the under margin. 

 The flagellar joints in the adult male are about fifty-five in number. 



The lahrum is broad and short, and is slightly bilobed. 



The mandibles (Pl. XVII fig. 6) are broad and stout. The incisive lamina is com- 

 paratively short and finely crenulated. The secondary lamina of the left mandible is 

 small, with the edge finely crenulated. The molar tubercle is large and broad, set ^vith 

 six or seven rows of pebble-like teeth, and provided with long bristle-like hairs. The 

 mandibular palp is long and well developed; the first joint is the longest and thickest; 

 the seeond is a little more than half as long as the first; the third is nearly as long as 

 the seeond. 



The labiiim has the lateral lobes thickly covered with hairs. 



The frst pair of maxillce (Pl. XVII, fig. 7) have the apical portion of the principal 

 lamina deeply hoUowed, and the margins fringed with strong teeth and five hairs. The 

 secondary lamina reaches only a little beyond the principal; the apex is armed with 

 sharp-pointed small teeth; the outer margin is furnished with long hairs, and at the base 

 of the inner margin there is a bundle of long bristle-like hairs. 



The secoind pair of maxillai (Pl. XVII, fig. 8) have the principal lamina small, 

 narrow, and curved; it is armed at the apex Avith a strong, sharp-pointed spine and 

 three or four smaller ones. The secondary lamina is much larger than the principal, 

 feebly bent, tlie outer margin fringed with long hairs, and the apex ending in a sharp- 

 pointed tooth. 



The inaxillipeds (Pl. XVII, fig. 9) have the basal portion narrow and nearly linear. 

 The lateral lamin» are narrowly lanceolate, with the inner margin furnished with bristle- 

 like hairs, and the apex tipped with two spines and a fcAv minute hairs. The median 

 lobe is tolerably long, rounded at the apex, and densely set with hairs. 



The peraion is quite as long as the pleon. The first two segments are firmly 

 coalesced, without any trace of a suture; the third segment is as long as the coalesced 

 first and seeond; the fifth segment is the longest ofall; its loAver lateral parts are expanded 

 backwards, overlapping half the sixth segment. 



