2S0 Mr. R. Kirkpatrick on the Mona.roneU'ula 



this feature is so well marked as to give the surface a pock- 

 marked appearance. 



The rha])liides, usually so characteristic of Tedania^ have 

 entirely disappeared. 



Locality. Winter Quarters, 10 fath. 



Tedania coulmani, sp. n. 



The single specimen is in the form of a finger-like fragment 

 5"5 cm. long and 1*7 cm. in its greatest thickness. The 

 colour is dirty grey and the consistence soft. The surface 

 shows the same circular pore-sieve areas as in T. variolosa. 

 Along one side of the sponge the surface has been torn away, 

 exposing an exhalant canal running along the length of the 

 specimen, but apparently tlie terminal oscule has been torn 

 away. 



Skeleton. — Rings of spicules, partly vertical, partly tan- 

 gential, isolated or in tufts, surround the pore-areas. 



The choano.-onial skeleton is formed of primary longitudinal 

 filjres about 120 yu. thick, joined by secondary fibres one 

 spicule in length and two to three in thickness, joining the 

 former at right angles. 



Spicules. — Megascleres : the clioanosomal acanthostyles, 

 475 X 18 fjb, curved, smooth, or with sparse spines, usually on 

 the upper and lower thirds of the length. 



Dermal ectosomal tornotes, 319 x 12*5 fji, smooth, straight, 

 fusiform, larger at one end tlian the other. Under a high 

 power each end shows a rounded shoulder prolonged into a 

 mucronate spine. 



Microscleres absent. 



The present species resembles T. variolosa in having the 

 circular pore-areas, and in the absence of rhaphides, but 

 differs widely in the character of the dermal tornotes. Both 

 species differ from all other species of Tedania in having no 

 microscleres. The nearest species to the present one are 

 Tedania tenuicajntata, Ridley, from the Straits of Magellan, 

 and Trachytedania sjrinata, Ridley, from the same locality ; 

 both of these have rhaphides, and neither has the circular 

 pore-areas, though in T. tenuicapitata there is a tendency to 

 a radial arrangement of bundles of dermal spicules. The 

 spination of the acanthostyles recalls a similar ciiaracter in 

 2'r achy tedania spinata. 



Locality. Coulman I., 100 fath. 



Mycale acerata, sp. n. 

 Sponge large, massive, with numerous small rounded 



