On a new Genus of Opossums. 2'.]d 



anticus rotuudatum, posticus suboblique curvatum ; margo veii- 

 tralis levitcr nrcuatus ; umbones deprcssi, approxitnati ; liga- 

 mcntiim broviculum, elevatum, pone umbones situm. Pagina 

 interna purpurea ; impressioues musciilari subpyriformos ; linea 

 pallii late arcuata; linea cardinalis antico tenuis, postice crasaa. 

 Dentes cardinales in utrai|ue valvarum duo, minuti. 

 Diam. antero-post. 22, umbono-marg. 13, crass. 7 mm. 



Ilab. Zanzibar. 



This shell somewhat resembles S. minor, Desh., from the 

 Philippines, but more oval in form and differing in other 

 respects. 



Fig. 3. 



Fi-. 4. 



Fig. 3. — Soletellina {Psammotcea) yibbonsi. 

 Fig. 4. — Soletellina {Psaminotcea) hrevis. 



Suletellina {Psammotcea) hrevis, sp. n. (Fig. 4.) 



Testa subovalis, levissime obliqua, inaequilateralis, depressiuscula, 

 albida purpureo radiata, concentrice levater rugata ; margo 

 dorsalis anticus declivis, leviter convexus, posticus brevier sub- 

 recto declivis ; latus anticus rotuudatum, posticum truncatum ; 

 margo veutralis arcuatus ; umbones acuti, elatiusculi. Pagina 

 interna purpureo radiata ; linea pallii late arcuata. Dentes 

 cardinales in utraque valvarum duo, minuti. 



Diam. antero-post. 12, umbono-marg. 10, crass. 5 mm. 



Hah. Zanzibar. 



The type specimen is prettily purple-rayed within and 

 without, but the species varies much in colour, some being 

 rayed only inside and others being dull white without rays. 



XXV. — A new Genus of Opossums and a neio Tuco-tuco. 

 By Oldfield Thomas. 



(Published by permission of the Trustees of the British Museum.) 



GlirONIA, gen. nov. {D idelphiidce) . 



General proportions of Marmosa. Ears narrower. Tail, 

 instead of being entirely naked beyond a short basal portion, 



