G. M. Thomson. — On New Zealand Pycnogonida. 243 



Fam. I. NYMPHONID-E. 



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, cheliforni ; palpi 5-jointed ; ovigerous legs 10- 

 jointed. 



1. N. compaction, Hoek. (See p. 242.) 



2. N. longicoxa, Hoek. (See p. 242.) 



Fam. II. COLOSSENDELBvE. 



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. Eostrum 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 ; Phano.demns, Costa, Pephredo, 

 Goodsir, Pasithoe, Goodsir, Endeis, Philippi, Paribcea, 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 caeca reach to the end of their 6th joint. 



3. Ammothea dohmi, n. sp. PL xiv., figs. 5-9. 



(A. pycnogonoides, Nob., N.Z. Journ. of Sc, 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 3rd joints are long, the 2nd short, the rest short and 



