24 C. F. JEN KIN. 



from corresponding portions of a series of tangential sections. Several tjf the chunihers 

 are numljered, and may be traced from one section to another. The distal ends of the 

 flagellated chambers are covered by a reticulated cortex with a skeleton formed of 

 curved triradiates (see Fig. 71). 



The gastral skeleton, formed of large quadriradiates, is shown in Ing. 72. 



The oscular skeleton is shown in Fig. 65. The quadriradiates at the edge 

 are smaller than the gastral quadriradiates. There are a few stout oxea and hair oxea 

 projecting. The dermal spicules extend to the edge. 



Spicules (Fig. 74). 



Oxea. — There are two sorts of oxea : — 



(a) Projecting hastate oxea, slightly crooked, 150 /a to 240 /x' long x 12 ju, to 



16 jx thick, bluntly pointed at each end. 



(b) Ilair oxea of considerable length. 



Triradiates. — The triradiates are of two sorts : — 



(c) Alate triradiates from the tubar skeleton, of very variable size. The largest 



are in the proximal joint of the skeleton, and they diminish towards the 

 distal end, where they change into type (</). Basal ray straight, sharply 

 pointed, 330 /x. long x 9 /x thick. Paired rays equal, straight, 120)Lt long 

 X 10/tt thick. Ural angle of sub-gastral spicules 160°. Oral angle of 

 spicules from the middle of the tubar skeleton 125°. 

 ((/) Alate triradiates from dermal cortex. Basal ray straight, bluntly pointed, 

 70 fj. to 130/0, long X 10/x thick, often shorter than the paired rays. 

 Paired rays equal, straight or slightly curved upwards, bluntly pointed, 

 forming a .short curve in the centre where they join the basal ray, 130 /a 

 to 140 /A long X 10 /A thick. Oral angle 105° to 110°, strongly folded; 

 angle of fold 110° to 130°. 



The Quadriradiates are of one sort : — 



(/') Alate quadriradiates from the gastral layer. Basal ray straight, tapering 

 uniformly to a sharp point, 500/0, to 850 /a long x 10 /a to 11 /a thick. 

 Paired rays sometimes very une(|ual in length, straight, or slightly curved 

 downwards, 150 /a to 400 /a long x 9 m to 12 /a thick, bluntly pointed. 

 Oral angle, 135° to 145°. Apical ray sharply pointed, nearly perpendicular 

 to the facial rays, slightly bent orally near the point, 7 /a or 8 /a thick. 



Family CHIPHORID^E. nov. 



Definition. — Flagellated chambers elongated, arranged radially around a central 

 gastral cavity, their ends projecting more or less on the dermal surface and not 



