1886.] O. F. von Mollendorff— T/^e Landsliells of PeraTc. 301 



type Nanina mossamhicensis, Pfr. Although Martensia, Semp., has been 

 considered a synonym of Trochonanina, Mouss., by some authors, doubts 

 have been expressed more recently whether the Polynesian species of 

 Trochonanina really belong to the same section as the East African cari- 

 nate forms of Nanina. If not, Martensia, Semp., has to be retained for 

 the latter group, and the section Martensia, Nev., has to be renamed. 



3. Ennea hungerfordiana, n. sp. 



T. ajperte perforata, ovato-conica, sulcis validiuscuUs, suhclistavtihus 

 verticalihus scul;pta, viridescenti-crystallina ; anfr. Q\ convexiusculi, ulti- 

 mus angustior, hasi valde coynjoressus, suhstrangulatus, valde scrobiculattis, 

 jpaullu7n ascendens. Apertnra verticalis, parva, irregulariter ovalis, peris- 

 toma late expansum, margine externo ad insertionem subito attenuato, 

 recedente, profunde sinuato. Lamella parietalis altissima, callum denti- 

 formem marginis externi fere attingens et cum illo sinulum fere circu- 

 lar em for ma7is. Long. 3, diam. IJ mill. 



Hab. — Ad Buket Pondong, leg. cl. R. Hungerford. 



Smaller and more ovate than the last. The greatest peculiarity of 

 the species is the sinulus of the aperture. In most species of Ennea, 

 the parietal lamella is opposed to a tooth or dentiform callosity in the 

 outer margin of the peristome, which latter gets suddenly thinner from 

 that place to the insertion and is more or less sinuate. Thus the lamella 

 and tooth enclose a more or less circular orifice connected with the rest 

 of the aperture by a small canal. In our species, the. lamella is so much 

 prolonged that it all but touches the tooth of the outer margin, and it 

 looks as if the lamella really were the continuation of the peristome. 

 The latter is, from the tooth upwards, not only suddenly attenuate, but 

 also receding, so that the orifice or sinulus is hardly visible in front, but 

 appears, when the shell is turned sideways, very much like a commencing 

 tube. The only species in which I have seen a similar formation is 

 Ennea vara, Bens., otherwise widely different from E. hungerfordiana, 



NANINID^. 



4. Ariophanta, n. sp. (?), (prox. N. (A.) interrupta), G. Kevill, 

 Handl. Moll. Ind. Mus., 1878, p. 20. 



Nualla Kangsa, Perak ; coll. Dr. Edmond Townsend. 

 No species of Ariophanta was found by Mr. Hungerford. 



5. Rhtsota, sp. 



Mr. Hungerford obtained a single specimen of a fine large Nanina, 

 diam. 55, alt. 32 mill. It is greenish-browu with a narrow dark brown 



