G. M. Tuomson.—On New Zealand Pycnogonida. 247 
The legs of the 8rd pair are 7'5 mm. long; the relative lengths of the 
joints being as follows :— 
2, 3, 4, 5, 6, 7; 
4. bo 516... 94 2. É 
the 4th being much the stoutest. The 4th and 5th joints are sparingly 
‘furnished with hairs, the slender 6th joint has a considerable number. 
The tarsal joints and claws are normal. 
Hab. Only one specimen of this elegant species was taken in Otago 
Harbour (27 feet) by the dredge. From its small size, I am afraid it was 
immature, but the great enlargement of the 4th joints of the legs would 
show that it was not far from sexual maturity, although no eggs were seen. 
Genus II. Phoxichilidium, Milne-Edwards. 
Body usually cylindrical, sometimes contracted and disc-like. Proboscis 
always strong, cylindrical, directed forwards; usually inserted considerably 
behind the insertion of the mandibles. Mandibles 3- (? 2-) jointed, the 
last joint with movable claws bent down in front of the mouth. Palpi 
wanting; represented by a small tubercle on the wall of the anterior seg- 
ment. Ovigerous legs 5-10-jointed, the last four joints never furnished with 
denticulate spines ; (5-7-jointed, only present in the males, Dohrn). Legs 
having all the joints of normal length; tarsal joint strongly spined on its 
inner (lower) margin; claws long, subsidiary claws rudimentary or wanting. 
The male genital openings occur in the 2nd joint of the 3rd and 4th 
pairs of legs. 
The animals of this genus are distinguished from all other Pyenogonida 
by a peculiar mode of development. The young, immediately on emerging 
from the egg—at which stage they possess an obtuse pyriform body, with 
3 pairs of rudimentary appendages—creep into the cavity of the body of a 
hydroid polyp (Hydractinia, Coryne, ete.) and undergo the rest of their 
development in this retreat. 
7. Phowichilidium obliquum, n. sp. Pl. xV., fig. 6; pl. xvi., figs. 1 and 2. 
Body contracted, lateral processes hardly separated ; the dorsal portion 
somewhat elevated; length 5mm. The proboscis is very stout and cylin- 
drical, and is directed downwards at an oblique angle ; its length is about 
half that of the body. 
The abdomen is about 3 mm. long, and stands rather obliquely upwards 
from the body; it is abruptly truncated at the end, but bears two long 
spines at the anterior side of its apex. doe 
"The front portion of the cephalo-thoracic segment is elevated into a 
transversely oval hump or cushion on which the oculiferous tubercle is 
placed. This organ is prominently developed, and runs up on its anterior 
face to a tolerably acute point; its summit is crowned with numerous short 
spines, 
