G. M. Tuomson.—On New Zealand Pycnogonida. 243 
Fam. I. NYMPHONIDA. 
Mandibles and palpi both present, and strongly developed. Ovigerous 
legs present in both sexes, and furnished, as a rule, with denticulate spines. 
(Only) Genus I. Nymphon, Fabr. 
Mandibles 2-articulate, cheliform ; palpi 5-jointed ; ovigerous legs 10- 
jointed. 
1. N. compactum, Hoek. (See p. 242.) 
2. N. longicoxa, Hoek. (See p. 242.) 
Fam. II. COLOSSENDEIDA. 
Mandibles rudimentary or wanting; palpi strongly developed. Ovigerous 
legs present in both sexes, and furnished, as a rule, with denticulate spines. 
Genus I. Ammothea, Leach. 
Body elongate or disciform, with the segments, as a rule, distinctly 
separated from one another. Rostrum spindle- or barrel-shaped, usually 
directed forwards, or sometimes downwards, and generally of considerable 
size. The abdomen or hind-body is of large size, and usually directed 
sharply upwards. Ocular-tubercle directed upwards, placed in the centre 
of the anterior segment. 
The mandibles are 2-jointed, but quite destitute of claws. (In imma- 
ture states they are more or less completely chelate, hence a great confu- 
sion has arisen in describing new genera; Phanodemus, Costa, Pephredo, 
Goodsir, Pasithoe, Goodsir, Endeis, Philippi, Paribea, Philippi, Platychelus, 
Costa, Alcinous, Costa, and Achelia, Hodge, being all probably immature 
forms of Ammothea, as Dr. Dohrn points out. 
Mandibular palpi 8-10-jointed, usually longer than the rostrum, and 
carried in a bent manner. 
Ovigerous legs 9- or 10-jointed, present in both sexes, with or without 
plumose spines, but without terminal claws. 
The legs usually have their terminal claws furnished with secondary 
claws, and the alimentary ceca reach to the end of their 6th joint. 
3. Ammothea dohrni, n.sp. Pl. xiv., figs. 5-9. 
(A. pycnogonoides, Nob., N.Z. Journ. of Se., vol. i., p. 28.) 
Body very small, disciform, lateral processes in close contact. The 
proboscis is long, cylindrical and directed downwards. The cephalo- 
thoracic segment is rounded above and slightly elevated; the oculiferous 
tubercle bluntly conical and bearing 4 distinct eyes on its sides. The ab- 
domen is long and rather slender, and stands in a slanting position from 
the body. The mandibles are 2-jointed, the last joint being a mere 
tubercle; they stand nearly erect on the front of the cephalo-thoracic seg- 
ment. The mandible-palps are rather longer than the proboscis and are 8- 
jointed ; the 1st and 8rd joints are long, the 2nd short, the rest short and 
