452 ME. F. CHAPMAK ON HADDOISTIA, 



Plate 27. 



Fig. 7. Small portion of a very thin vertical section through one of the deeper 

 layers, mounted in chlor-zinc-iodide after soaking in a solution oi 

 iodine in potassium iodide. Drawn under Zeiss D. Oc. 3. sh, the 

 empty sheaths of the bacterial rods (stained blue) ; pr, protoplasm ? 

 (stained yellow) ; o, fragments of Algae (stained blue). 



Fig. 8. Small portion of a very thin vertical section through one of the deeper 

 layers, mounted in a solution of iodine in potassium iodide. Drawn 

 under Zeiss F. Oc. 1. ch, chains of bacterial rods (stained yellow) ; 

 sh, empty sheaths (unstained) ; fr, protoplasm ? (stained yellow). 



Fig. 8 a. Fragment of an Oscillarian found in the same section and drawn to 

 the same scale. 



Fig. 9. Small portion of a vertical section, including the outermost layer, cut 

 by the parafBn method and stained with carbol-fuchsin after drying 

 on the slide, followed by iodine and mounted, after again drying, in 

 Canada balsam. Drawn under Zeiss F. Oc. 1. ch, chains of rods ;. 

 •pr, outermost layer of protoplasm ? 



On Saddonia, a new G-enus of tlie Foraminifera, from Torres 

 Straits. By Fkedeeick Chapmais-, A.L.S., F.E.M.S. 



[Read 18th November, 1897.] 



(Plate 28.) 



Among the many varied types of tlie Poraminifera, those 

 wMcli are adherent upon foreign bodies are often of peculiar 

 interest, chiefly by reason of the ability of the protoplasmic body 

 of the animal to wander freely over the surface of the object of 

 its support. Such genera, for example, as Nubecularia, Sagenella, 

 Flacopsilina, Bdelloidina, Webhina, Stacheia, SamuUna, Vitri- 

 wehhina, Carpenteria, JRupertia, Gypsina, and Folytrema, on first 

 acquaintance, were each with more or less difficulty assigned a well- 

 defined position in the .Order to which they belong ; but as they 

 became more fully understood they were found to exhibit many 

 points of interest in their plans of growth and the structure of 

 their tests, while in their errant condition they sometimes 

 furnished important data for estimating the inter-relationships of 

 other and more exclusive groups. 



Many of these adherent Toraminifera find their habitat on 

 coral-reefs and the coral debris derived from them; and the 



