346 



CLIMACOSPHENIA. 



Four species of Climacosphenia are known, all of which are marine or 

 fossil ; the best known is Climacosphenia monihfera Ehr., represented in the 



Fig. ioo. Climacosphenia monilifera. 



text (fig. ioo), which inhabits warm regions and is frequently found in 

 collections. It is the true type-form of the genus. 



By the side of Climacosphenia have been ranked Climaconeis, of which 

 there are two species known CI. Lorenzii Grun. and CI. Frauenfeldii Grun. 

 We are not acquainted with the first, but the second is nothing else than 

 Stictodesmis Australis Grev., which we have already mentioned at end of the 

 description of the Naviculae (p. 236). The raphe and the nodules of this form 

 do not permit us to consider it as belonging to the Pseudo-raphidese. CI. 

 Frauenfeldii appears to be only a variety of CI. Lorenzii. The genus 

 Climaconeis has been established on the bacillar form and the internal septa 

 of the valve. 



