208 TEANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



the presence of those triacts brings Amphiute under the 

 family Heteropidce. Their absence would have shown 

 this genus to belong to the Grantidce. 



Diagnosis of Amphiute, n.g. The flagellated chambers 

 are sometimes elongated and radially arranged, sometimes 

 irregular. Dermal cortex and gastral cortex are both well 

 developed and both contain large oxea arranged parallel 

 to the long axis of the sponge. 



Amphiute paulini, n.sp. (PI. XII., figs. 1 — 5; PL. XIII., 



%. i). ' 



Two specimens were sent to me for examination. The 

 larger of the two is a colony of eight individuals, united 

 together at their bases (PL XII. , fig. 1). The individuals 

 have a somewhat curved elongated cylindrical form, 

 tapering very slightly towards the distal osculum which 

 bears a small fringe. The larger individuals measure up 

 to 19 mm. in length and 3 mm. in diameter, the oscular 

 fringe is 1 mm. in length. The surface is smooth, and 

 shows a distinct longitudinal striation, due to the presence 

 of huge oxea in the dermal cortex. Colour (in spirit) 

 greyish or whitish. 



The canal system is sylleibid, and resembles closely 

 that of Vosmaeropsis macera, as described by Dendy {2, 

 p. 182). The dermal pores are from 0'052 to 0*096 mm. 

 in diameter, and lead into inhalant canals which soon 

 become narrower. The flagellated chambers are in many 

 cases elongated (0"44 by O'l mm.) and open into very 

 wide exhalant canals, which narrow again before opening 

 into the gastral cavity. Thus the flagellated chambers 

 seem to be radial] y arranged less with respect to the 

 gastral cavity, than to the exhalant canals (PL XIII. , fig. 1). 

 Sections, longitudinal or transverse, through the sponge 

 show also a large number of spherical, oval, and irregular 

 chambers. But whether the chambers are really of those 



