ON SO:\IE JAPANESl-^- CALCAREOUS SPONGES. 



37 



Textfig. 7. Amplmde ijimai. 

 a, b. Dermal triradiates. 



c, d, e, Subdermal triradiates. 

 f, g, Siibgastral triradiates. 



li, i, Gastral quadriradiates. 



j, k, Large dermal oxea. 



1, m. Large gastral oxea. 



o, p, q, Microxea. 



(a — i, o — q 100 X ; j — m, 40 x ). 



remaining greater parts, 230-360 /^ long and 8 /i thick. Paired 

 rays slightly curved, a little thicker than the basal, with a wide 

 oral angle, generally equally long but sometimes differentiated 



