neio Fiimilif of Crustacea Tsopoda. G7 



this island (the south island of New Zealand), two inoic 

 specimens of this species were taken in about 40 fathoms. 



A superficial examination satisfied mo that the species was 

 not an fdotea at all, while a closer inspection showed that, 

 while belon^jin;; to the tribe Valvifera, it did not come under 

 any of the existinf; families — Idothcids, Arcturidie, or CiifCti- 

 liida? — differing from them in the ])Ossession of a 3-jointed 

 palp on the mandibles. I have therefore to institute not oidy 

 a new genus, but a new family. At the suggestion of my 

 friend the Rev. T. R. R. Stcbbing I have named it Holo- 

 Qiialhus (o\o<i and yvdOo';). 



Tribe V AL V I FEK A. 



Family Holognathidae. 



Resembles Idotheidae in general appearance, but the 

 mandibles bear a 3-jointed palp. 



Genus Holognatiius, nov. 



Body elongated, depressed ; coxal plates well defined, 

 except in first segment of mesosome. Ceplialou distinctly 

 divided into two |)arts by a transverse fissure; posterior 

 portion short. Abdomen 5-jointed, four small joints pre- 

 ceding the large terminal one. Eyes distinct, lateral. 

 Superior antenna? 4-iointed ; inferior antennae peditbrm, 

 flagellum 1-jointed. Mandibles strong, with the cutting-edgo 

 produced into an acute lobe, molar tubercle well developed ; 

 ])alp 3-)ointed. MaxilUe normal. Maxillipcds with a 

 5-jointed palp. L('gs stout, somewliat uniform in structure ; 

 claw strong, hook-like, and unequally bidentate at the apex. 

 Anterior pairs of pleopoda with smooth broad lamcllre; two 

 posterior pairs with setose branches. Uropo la lamellar, 

 valve-like ; outer part cut off by a transverse suture and 

 bearing a second setose plate on the inner face. Incubatory 

 ])ouch normal. 



Ilulognathus Sleioartt\ Filhol. (PI. I.) 



1885. Idolen Stewarti, Filhol, Missioa de file Campbell, p. 492, pi. liii. 

 figs. 8 & 9. 



The body is elongated, that of the male being 40 mm. long 

 and 11 mm. broad, of nearly even width througiiout, con- 

 vexly rounded above. 



The cephalon has the front margin nearly transverse, very 

 sliirhtly hollowed in the middle, and slightly produced at tiic 



5* 



