306 i;EConi>s of the austhaliax jiusedm. 



this species. Onchidiina verruciilntuvi is dealt with by Nevill'-^, while 

 Moi'ch'^*' contributes }\is observations on the colouration of Peronia verrn- 

 culata, P. ))tuiirHi((na and P. nuirviorata. Da.\W described Onclndella 

 hnrealis, Bland and B'xwnef-^ Oiicliidiv))) schrannm', and Tappej-one Canefri^s 

 OurhiileUd (irisofuxca. 



Of Onchidella it is interesting to note that the research on this species 

 by Binney-^ showed that a definite jaw was present, while the whole 

 family had previously been considered to be agnathous. H. von Jhering^i 

 continbuted to the habits of Pemiiia, insisting on the fact that this species 

 lived between high and low water, and defended the branchial qualities of 

 the dorsal appendages — both much debated questions. 



In 1880-2 Semper produced his monograph of the family as part of the 

 '' Reisen in Archipel Philippinen", this was the tii'st and very successful 

 attempt to bring the family into systematic order, and to establish the 

 relationship of the genera and the species. In this work Semper admits 

 two genera — Ourliidhnu, and his new geuus Onrlu'dijin, the former made 

 up of eighteen species divided into six groups characterised by the 

 genitalia. 



Fischer and Crosse^s discuss the characters of the family, admitting 

 the genera Oiichidii(i)i without, and Peronia with, ramified dorsal append- 

 ages, both occuin-ing only on the shores of the Indo- Pacific Oceans ; and 

 also the doubtful genus Bnrhavinoiia and the genus Oiicln'dlelJa. 



In 1882 the thesis of Joyeux-Laffuie-^-' added to the work of Vaillant 

 a complete knowledge of the organisation and development of Oi)chidiit))i 

 reltii'inn ; and while this author is sceptical of the accuracy of the work 

 done by his predecessors, his taxonomy is at fault, and his observations 

 would cause the systematist to i-emove the family from the Pulmonata to 

 the Nudibi-anchiata. As a result of this paper Brock-^^ also came to the 

 conclusion that Oiirln'diitnt was a Nudibrancli " in process of becoming an 

 air breathe)"". Berglv'^, however, avIio must be admitted to be a leading 

 authority on the Nudibranchiala, rejects this opinion entii-ely ; and von 

 •Ihering^^" is opposed to the opinions of Bergli. 



Until 1894 new species were being continually described, among those 

 of interest to Australia being Ouchidiinn climneleo)t, descrilied by Bi-azier'" 

 from the Lane Cove River (Port Jackson). 



25 Xevill — Proc. Asiat. Soc. Bengal, Dec. 1870. 



-6 Morch— Journ. de Conch., xx., 1872, p. 325 ; and Vid. Medd., xi., 1872, p. 28. 



-' Dall— Am. .Journ. Conch., vii., 1872, p. 135. 



-** Inland iind Kinney— Ann. Lye. N.York, x.. 187-1, pp. 339-341, pi. xvi., figs. 3-5. 



-" Tapparone Canefri — Malac. Viag. Rlagent., 1873. p. 101, pi. ii., fig. la. 



a» Kinney — P. Acad. Phil., 1876, p. 184, pi. vi., figs, bb, ee. 



■" Jhering — Ueber die systeinni. Stellung von Peronia iind die Ordniing dei- 

 Nephropneusta, 1877. 



-•-• Fischer and Crosse— Moll. Mexique, 1878, pp. 68.3-689, pi. xxxi., figs. 1-12. 



2:> .Toyeiix-Laffuie — Organisation et developpment de I'Onchidie {These pniir hi 

 Fanilt(? des Hrienres dr I'urls, 1822). 



■•■* Krock — Kiol. Centralblatt, 1883, iii., 12. p. 370. 



s'* Bergh— Murphol. Jalir>>uch., Bd. x., 1884, p. 172 ; and An. Mag. Nat. Hist. 

 (5), xiv., 1884, p. 259. 



:'« Jhering— Zeits. wiss. Zool., 1879. xli., p. 259. 



»' Brazier — Proc. Linn. Soc. N.S.Wales, x.. 1886, p. 729. 



