234 



PHOTINULA WACEI sp.n. FROM THE FALKLAND ISLANDS. 



By JAS. COSMO MELVILL, M.A., D.Sc, and ROBERT STANDEN. 

 (Read before the Society, March i4tb, 1917). 



Photinula wacei sp. nov. 

 Ph. testa mediocrt, tenut, l(zvi, conoidea, margaritacea, epidermide 

 omnino oUvacea tenidssime contecta, i)nperfo7-ata, atifractibiis ^-6, 

 quorum apicales 2-j parvi, cornet, subhyalini, apice ipso deplanato, 

 cceteris Icevibtis, apud suturas vix itupressis, ultimo anfradu infra 

 suturam indistincte spiraliter bitceniato, labro paullum effuso, tetiui, 

 versus basim letiiter producto, columella obliqua, sifuplice, apertura 

 IcEte intus margaritacea, operculo corneo, -multispirali. 

 Alt, 8 ; diam., 7 mm. 



Hab., Falkland Isles. Coll. Dr. Richard Wace, of Darwin, East 

 Island. 



Photinula wacei sp. nov. 



We have quite lately received, in company with a very fine example 

 of Cerithium pullum Phil. {= ccelatiim Couth.) this distinct little 

 Photinula., which appears to differ from any of the varieties of its 

 congeners, Ph. expansa and Ph violacea King, as figured ^ by the late 

 Dr. Hermann Strebel in his exhaustive work on the molluscan fauna 

 of the Province of Magellan, including the Falklands. 



Our proposed species differs from Ph. violacea King in its narrower 

 and more conoid form, entirely also in coloration, also in the slighter 

 sutural impression, and absence of ventricosity in the whorls. The 

 double spiral taeniae or bands on the body whorl, just below the 

 sutures, though indistinct, are characteristic, and, finally, the texture 

 and substance of the shell shew much greater tenuity. In general 

 aspect Ph. wacei possesses considerable superficial likeness to one of 

 the smaller Elenchi. 



Mr. Rupert Vallentin kindly forwarded us these specimens, and to 

 him and Dr. R. Wace our thanks are due for the permission to 

 describe it. 



I Beitriige zur Keimtn. dev Mollusken-B'auna der Magalhaen Provinz. Zool. Jahrb. 

 Suppl. vii., 1905, p. 145, Taf. v., figs, i — 8, iib, 12 — 13. 



