A NEW SPECIES OF JloXIHJJA FROM POUT JACKSON. 



1:Y 



Professor T. Haiivev Joiixston-, M.A., D.Sc, F.L.S., 



and 

 O. ^V. TiKiis, B.Sc, liiology Depattuu'iit, Qint'iislaiul Uiiiversitv. 



(Plates xv.-xvi.) 



Tlie earliest record of lliDtdJla in tlie South Pacific is that by 

 Professor Haswell who, in lHS5, reported what he believed to be Ti.ririilis 

 from Neutral Bay, Port Jackson ; noting at the same time that instead of 

 inhabiting narrow fissures in rocks it was found under small stones just 

 above the limit of low water. Anatomically his specimens were said to 

 be identical with 11. vin'dis, e.xcept with regard to the reproductive oi-gans 

 which, however, were immature. 



Whiteleggei reported II. r/rn/As' from another locality in Port Jackscm, 

 viz., Mosman Bay, obtaining his specimen under a stone during a 

 low tide. 



Shipley- recorded the species from the Loyalty Islands, and frcun 

 the D'Entrecasteaux Gi-oup. 



In considering the remarkable known distribution of this species, 

 viz., Mediterranean, North Sea and South Pacific, Sluiter^ expressed 

 the opinion that a detailed examination of specimens from the last 

 named locality would show them to be distinct from the European 

 form. In the case of the Sydney. material we have found this view to be 

 justified. Tiie specimens are not TLrirldii^', but closely resemble 7»'. />;///rir. 

 Full descriptions of the latter are not at our disposal, but even from the 

 meagre accounts that we have, it is clear that the two species are not 

 identical. If they had proved to be so, then, taking into account the 

 known distiibution of li. iniiior (viz., the Mediterranean) the occurrence 

 would have been just as remarkable as if they had proved to be ]J. f///(?/.v. 

 It should be stated, however, that Ikeda* has reported B. minor from 

 Japan, noting at the same time certain differences in the anal vesicles,, 

 which again differ from those of the Australian forms here described. 



We desire to express our indebtedness to the Director of the Aus 

 tralian Museum, Sydney, for allowing us to le-examine Mr. Whitelegge's 

 specimen ; and to Professors W. A. Haswell, F.R.S., and S. J. Johnston 

 of the Sydney University for the opportunity to use Professor Haswell's 

 original material. 



' Whitelegge— Proe. Koy. Soc. N.S.Wales, xxiii., 1889, pp. 163-323. 



- Shipley in Willey's Zoolou'. Results, iii., 1899, pp. 3;io-3o3. 



=' Sluiter — Siboga Expeclitie. Monogr. 2") (Gephyrea), 1902. 



J Ikeda— Journ. Coll. Sci. Univ. Tokyo, xx., 1904, pp. 72-73. 



