XESTOLEBERINAE Sars 1928,n.2kh2, a subfamily of Cytheridae 
i ee re ee 
Metacypris. 
XESTOLEBERIS [2 snecies: Cythere nitida Liljeborg, and C. 
auriantia Baird 1838, vol.2,p.143,n1.5,f.26; the 
latter being designated type by Brady and Norman 
18869,p.188] Sars 1866,p.66,67 { Cytheridae-- 
Xestoleberinae by Sars 1928,p.242] Recent, North 
Atlantic, more than 100 described species. 
XJPHICHILUS [2 species: Bythocythere tertissima Norman 
1869,p.294 * Xiphichilus tenvissimus (Norman) by 
Brady; and X. amygdaloides,n.snp.! Brady 1870, 
p.369 [not Xiphocheilus Bleeker 1856 = Machaerina 
Brady and Norman 1889,p.237, nom.enov.! Recent, 
British Isles. 
XYSTINOTUS [X. wriehtorum: Kesling 1953a,n.197 [Drenanellidae 
by Kesling! Devonian, Ontario. 
YOUNGIA ‘Y. rectidorsalis] Jones and Kirkby 1886c,p.517; 
Jones and Kirkby 1887,p.515 !Cytheridae by Ulrich 
1894,7.632; not Youngia Lindstrom 1885, a Tri- 
lobite; * Youngiella Jones and Kirkby 1895,0.456, 
nom.enov. | 
194 
