560 APPENDIX. 



No. V, 



ON THE MOLLUSCA 



COLLECTED BY ME. MACGILLIVEAY DURING THE 

 VOYAGE OE THE EATTLESJSrAE:E. 



Br PROFESSOR EDWARD FORBES, F.R.S. 



I. On the Bathymetrical Distribution of Marine 

 Testacea on the Eastern coast of Australia. 



As in every instance the exact locality, depth and 

 character of habitat of each species of Mollusk taken 

 were carefully noted at the time of capture, much more 

 valuable information elucidating the distribution of shell- 

 fish in the Australian seas has been collected during this 

 expedition than was ever before obtained. Whilst new 

 species are usually sought after by collectors with eager- 

 ness, the habits and range of the commoner or less 

 conspicuous forms are passed over without observation.* 



* An extensive collection of landsbells was made at Madeira. They proved 

 on examination to be all known species, including several of the rarer forms, and 

 not a few of those discovered by the Rev. Mr. Lowe. They were compared 

 with Madeiran specimens by Mr. Vernon Wollaston. When the Rattle- 

 snake touched at the Azores on the return voyage, a few landshells were col- 

 lected at Fayal. Among them was the HelLv barbula, an Asturian species, 

 Helix pavperala, and Bulimus variatus, Madeiran or Canarian forms. A 

 considerable number of marine and terrestrial Testacea were procured at Rio 

 de Janeiro, not a few of them new and of great interest. Terehratnla rosea 

 was dredged off Rio in thirteen fathoms water, on a coarse sandy bottom. 

 Collections were also made at the Cape of Good Hope, at Mauritius and in 



