364 Rev. T. R. R. Stebbing on two new 



EXPLANATION OF PLATE XIV. 



(Structure of Catagma.) 



Fig. 1. Transverse sections of simple spicules of the skeletal fibre. 



(X 435.) 

 Figs. 2-5. Variously curved simple spicules, seen longitudinally. ( X 435.) 

 Fig. 6. Quadriradiate spicule slio-«ing three arms lying in the plane of 



the section, and a circular cut surface from which the foui'th 



arm has been removed. ( X 315.) 

 Fig. 7. Triradiate form with a part cut away at a. ( X 315.) 

 Fig. 8. Quadriradiate spicule, not fully exposed, but suggestive of a 



Stelletta 9,^\cvle. (x 315.) 

 Fig. 9. Transverse sections of midtiradiate spicules, exhibited at the place 



where the fibre curves at right angles out of the plane of the 



section, a a, edge of the fibre where cut across at the bend. 



(X315.) 

 Fig. 10. Irregular form of spicule, terminating abruptly against the edge 



of the fibre a a. (x 315.) 

 Fig. 11. In-egular quadriradiate spicule. (X 435.) 

 Fig. 12. Quadriradiate spicule with bifurcated rays. ( X 315.) 

 Fig. 13. Simple quadriradiate spiciUe, resembling in form one of the spi- 

 cules of Pachastrella nbyssi. ( X 315.) 

 Fig. 14. Triradiate arms showing a cut surface at a. (X 315.) 

 Fig. 15. Curved terminal part of a spicule, ending abruptly against the 



edge (rt a) of its fibre, through which it probably originally 



pi'ojected. (x 315.) 

 Fig. 10. Large, irregular quadriradiate. a a, edge of fibre in which it 



lies imbedded. ( X 140.) 

 Fig. 17. Simple quadriradiate, showing all four arms, (x 315.) 

 Fig. 18. An irregular form of quadriradiate, one arm closely resembling 



one of the curved simple spicules. ( X 435 ) 

 Fig. 19. Quinqueradiate spicule. ( X 435.) 

 Fig. 20. Fibre {a a «) near the exterior of the sponge, with included 



multiradiates, some having the shaft directed inwards and the 



rays outward. ( x 4-35.) 

 Fig, 21. Edge of a fibre showing an echinating quadriradiate seated close 



to the surface of the fibre, with one ray projecting outside it 



into the bordering granular deposit. (X 140.) 

 Fig. 22. Usual position of the echinating multiradiate in the fibre, a a, 



surface ; b b, centre of the fibre ; c c, transverse sections of 



similar nudtiradiates ; d, projecting ray of echinating spicule ; 



e e, simple spicules lying longitudinally in the fibre and crossing 



the echinating ray transversely, (x 435.) 



XXXIX. — On tioo new Species of AmpJiipodous Crustaceans. 

 Bj the Rev. T. R. R.' Stebbing, M.A. 



[Plata XV.] 



Ampkilochus Sabrince, n. sp. 



The upper antennae have the three joints of the peduncle 

 short, subequal in length, the first tvs^o stout, the third very 

 slight. The flagellum, of six articulations, is tapering, its first 



