276 Proceedings of the Royal Physical Society. 



Explanation of Plates X. and XL, figs. 1-3. 



PI. X. Two cells of Sertularia pumila, on which Ophryodendra are attached, — 

 the figure on the left side of the centre with gemma and contracted 

 proboscis, that on the right side of the centre with proboscis extended ; 

 the trunks of two others are shown in various stages of extension. 



PI. XI. figs. 1-3. Young of Ophryodendron in various stages of development. 



3. On Dendroplirya radiata and D. erecta (nov. gen. et sp.). 



The Khizopodous animals to which I have given the name 

 of Dendroplirya are found plentifully on Sertularias, Flus- 

 tras, Fuci, and stones, in low water pools at Granton Quarry, 

 near Edinburgh. There are two species, D. radiata and 

 D. erecta. 



D. radiata. 



Its general appearance is that of a small shelly mass, 

 from the borders of which radiates a system of branched 

 membranous tubes, more or less coated with mud or other 

 matters. In young specimens the central shell is absent, 

 and the animal presents the appearance of an irregular 

 system of branches radiating from a centre. The shape of 

 the adults is very various, and depends on the surface to 

 which they are attached ; they attain sometimes a diameter 

 of nearly a quarter of an inch, though generally much 

 smaller. The shell is not acted on by acids, and is there- 

 fore siliceous. The animal itself can seldom be detected, 

 as it lies concealed within its central flinty stronghold and 

 the complicated system of earthworks surrounding it. 



D. erecta. 



In this species, found on stones, the branched, mem- 

 branous, and mud-clothed tubes, instead of creeping over the 

 surface to which the animal is attached, spring upwards 

 and outwards, as in PI. XL fig. 4. Delicate pseudopodia, 

 linear or forked (figs 4. and 5), are readily observed to pro- 

 trude themselves from the extremities of the branches, 

 accompanied sometimes by lobular processes of the sarcode 

 of the animal. The patelloid shell of D. erecta may be 

 easily detached from its seat, and its tenant, a small patch 

 of semitransparent sarcode, scooped out with a flat-pointed 

 needle and transferred to the stage of the microscope. It 



