32 



R. KIRKPATRICK. 



The anisoclicles of the embryos nearly rcsenilile tlic smaller kind of these spicules 

 found in the choauosome of the type specimen. 



The type specimen (No. 184) was dredged near Winter Quarters, No. 11 hole, 

 28 fms. ; specimens 202, 287, and 289 were dredged from No. 10 hole, 1:50 fms. 



Differential Diagnosis of the Four Si'ecies of Ioi'kon with Modified Acanthoktyles. 



Tedania variolosa. 

 (Plate XXL, figs. 1, la, and Plate XXV., fig. la-1).) 

 1907. Tedania variolosa Kirkpatrick (10a. p. 270). 



Sponge in form of a mass . of thick Habellate or digitate fronds arising from a 

 common l)ase ; with circular sphiuctrate oscules, each about 1 cm. in diameter, situated 

 at the summits, or along the upper edges of the branches, the canals into which they 

 lead extending nearly to the base of the branches. General surface of the spono-e 

 covered with circular pore areas each about 4 mm. in diameter, the oval or circular pores 

 being about 90 m iu diameter, and the strands of the poral reticulum al)out 30 fi in 

 breadth. Colour iu spirit, pale brown. Consistence, soft and fleshy, being easily torn. 



Flagellated chambers, 42 X 35 m, oval, ajihodal, with aphodus (in a measured 

 example), 13 m long. 



Skeleton. Choanosomal skeleton formed of loosely agglomerated compound, 

 longitudinal or main bundles altout 1 mm. in diameter, curving out to the surface as 



