BY R. VON LENDENFELP, PH.D. 1099 



is only 2 to 2*5 mm. thick. Intercanals triangular regular and 

 conspicuous connected with the outer water by small pores which 

 pervade the dermal layer. No subdermal cavities. 



Spicules : Gastric quadriradiates rare. One differentiated ray 

 protruding into the gastral cavity, straight, short and stout, conic 

 and pointed 0-055— 0-006 x 0-005. Tangental rays regular in one 

 plane, vertical to the centripetal ray 0-07 x 0-005. 



Triradiate spicules of the Parenchyma, sigittally differentiated. 

 Centrifugal unpaired ray straight, conic, rounded at the end 0-2— 0-3 

 X 0-006— 0-007 mm ; the paired rays slightly bent irregularly or 

 curved with the convex side looking inwards O'll x 0-005. 

 Regular Triradiates with straight, cylindrical, abruptly pointed 

 rays are met with towards the outer surface. Their rays measure 



0-1 0-14 X 0-007. Dei-mal Triradiates similar in shape to the 



sagittal ones in the Parenchyma are very numerous. Their unpaired 

 ray is situated radially and points inwards. The paired rays stand 

 nearly vertical on the sagittal one and are very variable in size, 

 always however very slender ; they form a dense and hard dermal 

 felt. The dermal acerate spicules are cylindrical and pointed at 

 both ends, more abruptly at the distal end. They are very slender 

 and in specimens nearly always broken off in consequence of their 

 extreme tenderness. They measure 2—3 x 0-014 mm. These 

 spicules are amassed in clusters of 10 to 15 and they protrude 

 |tlis of their length beyond the surface, on which they stand 

 vertical. The clusters are regularly disposed and situated at 

 intervals of about 2 mm., from one another. In these " villi " 

 also small linear Acerates are met with. 



Locality: East Coast of Australia, Port Jackson on rocky 

 bottom 5 to 10 fathoms. Ramsay, Von Lendenfeld. 



9. GENUS. UTE. O. Schmidt (1). 

 Uteinse, with a cortex consisting mainly of several layers of large 

 acerate spicules disposed tangentally. 



(1.) 0. Schmidt. Die Spongien des Adriatischen Meeres. Leipzig, 1862. 

 Seite 16. 



