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U.S. NATIONAL MUSEUM BULLETIN 271 



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Figure 90. — Eusiridae: a, Eurymera monticulosa Pfeffer (Chevreux, 1906c). Upper lips: 

 b, Eusirus propinquus Sars (1895, pi. 147); c, Pontogeneia inermis (Kr0yer) (Sars, 1895, 

 pi. 159). Mandible: d, Eusirus; e, Pontogeneia; f, Liouvillea oculata Chevreux (1912b). 

 Lower lip: g, Pontogeneia; h, Eusirus; i, Bovallia gigantea Pfeffer (Chevreux, 1906c); ;', 

 Pontogeneoides abyssi NichoUs (1938); k, Eurymera; I, Meteusiroides keyensis Pirlot (1934). 



