XXI CLASSIFICATION—DECOLOPODIDAE 531 
CLASS PYCNOGONIDA! 
Marine Arthropoda, with typically seven (and very exception- 
ally eight) pairs of appendages, of which none have their basal 
joints subservient to mastication, the first three are subject to 
suppression, the first (when present) are chelate, the second 
palpiform, the third ovigerous, and the rest form ambulatory 
limbs, usually very slender and long; with a suctorial proboscis, a 
limbless, unsegmented abdomen, and no manifest respiratory organs. 
Fam. 1. Decolopodidae-——Appendage I. dwarfed, but com- 
Fic, 282.—Decolopoda australis, Bights. A, x 1: from a specimen obtained at the 
South Shetlands by the Scotia Expedition. B, First appendage, or chelophore. 
(A, original ; B, after Hodgson. ) 
plete and chelate, scape with two joints; IT. 9-10-jointed; IIT. 
well developed in both sexes, 10-jointed, the terminal joints with 
1 See (inter aliw) Dohrn, 7.c. ; E. B. Wilson, Rep. U.S. Fish. Comm. (1878), 1880 ; 
Hoek, Chall. Report, 1881 ; G. O. Sars, Norw. NV. Atl. Hxp. 1891; Meinert, Zngolf 
