Description of Two New Phyllopoda. 21 



neck-shaped constriction and is strongly incurved, terminating 

 with a finely fluted, triturating surface (fig. 8). 



The anterior maxillae (PI. II, fig. 9) exhibit the usual 

 structure, being each composed of a thick, muscular basal 

 part and a thin semilunar lamella movably articulated to 

 its end, and fringed with a dense row of incurved, falci- 

 form setæ. 



The posterior maxillæ (fig. 10) are very small and 

 rudimentary, forming only 2 simple conical prominences 

 lying somewhat outside the anterior maxillæ, and each 

 tipped with 2 very small hairs. 



Of branchial legs there are 20 pairs present, the posterior 

 of which, however, are so very small as easily to escape 

 attention. In the two Japanese species, Mr. Ishikawa states 

 the number to be only 18 pairs, and the same number is 

 also given by Dr. Packard in the 2 American species, it 

 being regarded by him as a generic character. In the 

 North Australian species, however, there is quite certainly 

 a greater number of legs, and by repeated dissections, I 

 have constantly found in fully grown specimens 20 pairs, 

 as above stated. In structure, the legs would seem to agree 

 exactly with those in the other species of the genus, the 

 epipodites being of very large size, as compared with those 

 in Limnadia and Pavalimnadia. On a closer examination, 

 they are found successively to increase in size from the 

 1st to the 7th or 8th pair, where they attain their fullest 

 development; from thence, they again rapidly diminish in 

 size backwards (see PI. II, fig. 3; compare also PI. V, fig. 8). 

 The endopodite (see PI. Ill, figs. 4, 5) exhibits the characteristic 

 narrow form, and has at the base a well-developed, incurved 

 coxal lobe, terminating in 2 short denticles, and having 



