Page:Transactions NZ Institute Volume 15.djvu/97

another portion stretching out of the part already described, like a greatly elongated egg; this portion is exceedingly delicate and transparent; the small dot which marks the end of it is often more easily seen than the rest. (Fig. 1b.)

The mandible bears a three-jointed appendage; the first and second joints being equal in length and longer than the third; the last two bearing stout setæ which increase in length as they approach the distal ends of the joints on which they are situated (fig. 1c).

The first maxilla consists of two nearly straight lobes, the inner one tipped with slender plumose setæ, the outer one longer and larger and bearing strong serrated setæ at the extremity (fig. 1d).

The second maxilla consists of three delicate overlapping plates; the two outer ones of which bear similar long simple setæ which appear to be transversely ribbed (fig. 1f). On the third and inner lobe are setæ, two of which bear delicate filaments near the base only; the others bearing filaments on one side only throughout the whole length of the seta (fig. 1,e,f,g).

The maxillipedes have the basal portion long and straight, tipped at the end with several moderately strong setæ. This basal portion bears a four-jointed appendage, the joints of which decrease in size distally; the first three have the distal end produced into a rounded lobe tipped with setæ. (Fig. 1h.)

The first pair of legs (fig. 1k) is short and stout; the meros is short and expands greatly at the distal end, carpus very short, the dactylos is large and bears at the end two claws, the terminal one larger than the other which bears a small piece projecting on its inner side (fig. 1l). The large claw appears to be more or less articulated to the rest of the dactylos. The second leg (fig. 1m) is much longer and slenderer; the basos has its inner side fringed with short setæ, the meros is longer than in the first and expands distally, the carpus is slender and as long as the propodos; the dactylos ends with two claws (fig. 1n), the smaller with several stiff projections along its inner edge, one towards the base of the claw being much stouter than the others. The remaining legs are somewhat like the first, though not so stout, being thus more or less intermediate in form between the first and the second.

The pleopoda or branchial plates have the basal joint broad and supporting two large branchial plates, the inner one being longer than the outer and broader at the base than at the end; both abundantly supplied with long plumose setæ (fig. 1o). The pleopoda all rest in a cavity formed by the excavation of the under side of the segments of the pleon, much in the same way as in Sphæroma.