ON THE GENUS KRAIJSSINA IN TASMANIA. 



By W. H. Tweltetrees and W. F. Petterd. 



In 1852 the late Dr. Davidson established the genus 

 Kraussia (whicli he afterwards altered to Kraussina) for a 

 small terebratuloid brrichiopod with dimiuiitive arms and a 

 very insignificant brachial support, consisting of two diver- 

 gent lamellae or latnral |iroce-ses branching oft' right and left 

 from the median septum of the dorsal valve. The genus 

 now accommodates seven species, all recent, viz.: — 



Kraussina rubra, Pallas. Found off Natal and Port Eliza- 

 beth, Soutli Africa. 



,, Cognata, Sowerhy. Found off Cape of Grood 



Hope. 



„ Deshavesi, Davidson. Found off Cape of Grood 

 Hope, 120 fathoms. 



,, pisum, Valenciennes. Found off Gape of Good 



Hope, 150 fathoms. 



„ Davidsoni, Velain. Found at ihe Island of St. 

 Paul, low water mark. 



,, Lamarckiana, Davidson. Found at Port Jackson, 



N.S.W.; S.E. Australia ; New Zealand ; Mouth 

 of River Tamar and in Long Bay, Tasmania. 



„ Atkinsoni, Tenison Woods. hVmud Long Bay, 



South Tasmania, 10 fathoms. 



Professor Deslongcha.mps has carried K. Lamarckiana and 

 K. Davidsoni over to a sub-genus Megeilina, possessing two 

 rudimentary septum processes underneath the calcareous 

 forks supporting the brachial (or more strictlj^ speaking, 

 labial) appendages. 



The two Tasmanian species have engaged our attention. 

 The discovery of comparatively smooth individuals of what 

 appear to be K. Lamarckiana at George Town, near the 

 mouth of the Tamar, has suggested an inquiry as to whether 

 these really belong to that species, and if so, what are the 

 real differences between them and K. Atkinsoni. At the 

 time of Davidson's last monograph, the latter was regai'ded 

 as the sole smooth species of its genus. 



Kraussina lamarckiana is frequent at George Town and 

 between there and the Tamar Heads, at and below low water 

 mark, attached t^ rocics and large stones. Though the shells 



