THE PROCEEDINGS OF THE LINNEAN SOCIETY 



longitudinalibus concinnis, minutis ;' varicibus convexis, latis, 

 elevatis ; apice obtuso, nucleo Icevi, rapide crescente, covspicuo ; 

 apertura elliptica, intus dentata, peristomate producto, acuto, labio 

 conspicuo, canali pra-longo, angusto, recurvo. Alt 9, lat. 5, alt. 

 spircB. 5 millim. 



This is a small almost tarrefcted species, veiy much of the 

 character of all our Australian Tritons, and most like one which 

 is peculiar to Australia, T. Quoyi, which however though one of 

 the very small members of the genus, is much larger than this 

 fossil. It has all the characters of the genus, the unequal spiral 

 lirae all finely wrinkled, the obsolete ribs and the conspicuous 

 varix round the mouth. It has two important marks of dis- 

 tinction, namely the smooth obtuse Natica like nucleus and the 

 long narrow recurved canal. The mouth is also somewhat 

 remarkable, as it is Murex like, dentate and almost entire, and 

 there does not appear to be any posterior plait on the columella. 

 For its size its markings are very perfect and neat. It is some- 

 what like T. paivulum, Michelotti, but is smaller than any living 

 or fossil form known to me. 



I have dedicated the species to Mr. Samuel Pratt Winter, 

 whose station is not far from the Muddy Creek beds, and whose 

 kindness and hospitality have enabled me to gain all the know- 

 ledge I have of them. 



Prof. Tate regards this shell as a young Banella belonging to 

 the section in which the varices are not continuous. The species 

 is allied to one from the Molluccas. 



PiSANiA TENUiCOSTATA. Plate 20, fig. 6. 



P. t. parva, anguste ovata, ienui, nitente, anfr. 5, (nucleo t 

 decoll.) convexis, parwn decUvibus, crebre liratis et tenuiier sed 

 valide creberrime costatis, ita ut tota testa minutissime et eleganter 

 reticulata appaveat; costis tenuibus (in ult. anfr. 35), a liris 

 quasi coopertis et ideo crebre granulatis ; liris hitis, planatis, 

 approximatis, interstitiis a'quantibus, interdum lirulis parvioribus 

 inter positis ; varicibus numerosis ultimo ea'cluso 2 vel 3 iii omn. 

 anfr., latis conspicue liratis; apertura ovata, labro varice incras- 

 sato, labio Icevi, exacte definitoj canali brevi vix recurvo. Long. 10, 

 lat. 5, 



