r ) 



CAIA'AREA. 27 



straight in facial view, but often slightly U'lit in side view at a point a 

 short distance from the junction with the paired rays. Tliis ln-inl i> 

 eonnected with the close manner in which jours of these sjiicules lie 

 together. Paired rays lx;nt slightly downwards, nearly equal in length, 

 sharply pointed, 70 M to 110 p. long x 3ft to 5 ft thick. Oral angle 140 

 to 150. Folding considerable, angle of fold 115 to 125. Apical ray 

 thin, 50 p. to 65 ft x 3ft, considerably set over out of line with the Imsal 

 ray. Angle between apical and basal ray alx>ut 170. 



Oscular ftpicult-H. The fringe flomhtii of : 

 (i) Hastate oxea, nearly straight, 240ft to 700ft long x 5 ft to 8 ft thick. 



The edge wnthtff of : 



(k) Small quadriradiates. Basal ray straight, uniformly tapering to a sharp 

 point, 110ft to 170 p. long x 5 p. to 8 ft thick. Paired rays equal, 

 considerably curved downwards, sharply pointed, GO ft to 100 ft long x SM 

 thick. Oral angle about 160. 



HYPODICTYON. 



Chiphorids in which the radial chamtars with freely projecting distal cones are 

 linked so as to form a reticulated pattern round the large intcrcauals. The tulmr 

 skeleton is articulate, the first joint being wholly or partially formed of chinctines. 



This new genus in the family Chiphoridee corresponds to the genus Terithrenodes in 

 the family Sycettidx. 



There is only one species in this genus. 



HYPODICTYON LONGSTAFFI. 

 (Plate XXVIL, Fig. 10, and Plates XXXIII. and XXXIV., Figs. 81-97.) 



There are four specimens of this new species in the collection. All are in the form 

 of longish tubes more or less bent, stouter in the middle and tapering towards each 

 end ; the upper ends terminate in short, smooth, oscular collars, and the lower ends 

 are rounded off. The whole sponge, except the oscular collar, is covered by a 

 meshwork of projecting spicules which give the surface a bristly honeycombed 

 appearance (see Figs. 10 and 81). 



The dimensions of the four specimens are as follows : 



Length. Maximum diameter. 



60 nun. .... 15 nun. 

 37 mm. .... 7 mm. 



50 mm. .... 5 mm. 



37 mm 9 mm. 



All the specimens are white in colour as preserved in spirits. 



