244 U.S. NATIONAL MUSEUM BULLETIN 236 



Endopodites of legs 2 to 4 (figs. 97b-d) 3-segmented, legs with 

 following setal formula: 



endopodite exopodite 



leg 2 1.1.121 0.1.222 



legs 1.2.221 0.1.322 



leg 4 1.1.221 0.1.322 



Noteworthy are the absence of setae on the internal margins of 

 the 1st exopodal segments and the presence of 2 setae on the internal 

 surface of the 2nd endopodal segment of leg 3. 



Leg 5 (fig. 97e) with large, oval, well-developed exopodite, indis- 

 tinctly separated from smaller baso-endopodite. Baso-endopodites 

 of both sides closely approximated but not coalescent. Apex of 

 baso-endopodite reaches halfway along exopodite. Baso-endopodite 

 with 5 marginal setae, 3 of which are lengthened. Exopodite with 

 total of 6 setae, 2 innermost lengthened. External lobe with fine setae. 

 Armature of genital plate composed of 3 setae (fig. 96/). Unfor- 

 tunately, the genital somite was ruptured during dissection, with 

 the result that I cannot give a description of the ventral aspect of 

 the somite. It has been figured, however, by Nicholls (1941, fig, 19). 



Color opaque greenish yellow, no eye or pigmented spots visible. 

 The larger female carried a single sac containing 12 eggs. 



Kemarks. — Parialysus robustus originally was described from a 

 female specimen from Sellick Beach in South Australia and a male 

 from Spencer Gulf in South Australia (Nicholls, 1941; 9 0.78 mm., 

 c? 0.81 mm.). An additional female specimen occurred at Port 

 Denison in Western Australia (Nicholls, 1945; ov. 9 1.1 mm.). The 

 specimens were obtained from washings of stones and invertebrates 

 off the edge of coral reefs. The present specimens are slightly smaller 

 than those previously recorded but probably have been strongly 

 contracted. They were obtained from a sand sample taken some 

 340 feet from the reef edge at Falarik in the Ifaluk Atoll. 



Family Metidae G. O. Sars, 1910 



This family includes but a single genus: 



Genus Metis Philippi, 1843 



This genus has a respectable number of synonyms: Thoracosphaera 

 Kriczagin, 1873; Ilyopsyllus Brady and Robertson, 1873; Abacola 

 Edwards, 1891; Corazzoides Grandori, 1912; Rubeus Grandori, 1912; 



