(hi Lcctotypes of typical Australian Mnrsiij>i<(/s. lL'7 



{•alatiiie tectli turminjf an uiiiutenuptt'd haiwl, which i.s some- 

 what broiulei" than that of the preinaxillary. Nasal barhi-l 

 not quite 1^ as long us diameter of eye. Maxillary barbel 

 1^ times ill length otlu-ad. Outer mandibular barbtd twico 

 in head. Iniu-r mamlibular 5 tinies in head. Gill-rakers 

 rather short, widely suf, 4-}- 8, on anterior arch. Dorsal I G, 

 almost entirely in advance of the ventral, its distance from 

 end o£ snout ^ ^^ i^^ distance from the base o£ caudal. 

 Dorsal spine rather slender, its upj)er fourth feebly serrated 

 behind (6 small teeth in the type) ; its length is contained 

 1! times in length of head. Anal .50, four anterior rays 

 Mniple, the following gradually tlccnasing in length. Pectoral 

 reaching ventral. The spine moderately seriated on the 

 inner side, a little broader and somewhat longer than the 

 dorsal one. Caudal deeply forked, with pointed lobes. 

 Caudal peduncle only a little longer than deep. Silvery, pale 

 brownish above, the blotch above the pectoral rather difi'use. 



One specimen, 2'.>5 mm. (including; caudal). Bonia, Lower 

 Congo, collected by Capt. C. J. Ekblom. 



X. — A Selection of Lcctoti/pes of the typical Austi-alian 

 Marsupials in the British Museum Collection. \jy OluI'IELU 

 TUOMAS. 



(Publbhed by peroiiasiou of the Trustees of the British Museum.) 



The selection of lectotyjjes of the Australian rodents in the 

 JJritish Museum having already, even in the short time that 

 has elapsed since it was dune, proved of much convenience 

 and benefit in working at them, 1 pri)j)ose nuw to i\(j the 

 banie with the nuirsupials. 



It was Gould's habit, when describing nienibers of that 

 favourite group of his, the kangaroos, to describe the species 

 from both male and female — tliese, therefore, being the co- 

 types. And Gray, in less formal fashion, but with the same 

 result, described many species on co-lypes instead of single 

 specimens, so that a good many of the described forms need 

 a selection of their lectotypes. 



The co-types have all been recorded as such in the * Cata- 

 logue of Marsupials,' and it has seemed convenient, in doing 

 the selection, to nuike a refeiuncc in each cato to the proper 



