206 DE. HIFDE AND MK. HOLMES ON SPONGE-REMAINS 



of the laterals, tubercle distinct, diamond-shaped. Smaller end 

 of spicule semi-elliptical, lateral palms with faintly marked 

 margins ; tubercle wedge-shaped, with small processes on either 

 side terminated by tubercles ; shaft slender. Length of spicule 

 •07 mm., of larger end 'O^B mm., widthof same '0S4^ mm. ; length 

 of anterior palm -051 mm., width -017 mm. Smaller end, length 

 •013 mm., width '019 mm., thickness of shaft -003 mm. Axial 

 canal clearly shown. 



JEsperella (d). — PI. X. fig. 5. Inequianchorate, large end 

 rounded, lateral palms evenly curved, not prolonged below, 

 anterior tubercle large, pear-shaped ; small end of spicule oblong, 

 lateral margins strongly reverted, central tubercle large, ovate. 

 Shaft stout. Length of spicule '066 mm., o£ larger end '035 mm., 

 width the same; length of smaller end of spicule '012 mm., 

 width '02 mm. ; thickness of shaft '006 mm. The axial canal 

 extends through the shaft from one tubercle to the other. 



Esperella (e). — PI. X. fig. 6. Liequianchorate with semi- 

 elliptical larger end, the margins of the lateral palms evenly 

 curved and revert, tubercle large, pear-shaped, anterior palm 

 shorter than the lateral ; smaller end of spicule subquadrate, 

 central tubercle ovate, prominent, extending below the level of 

 the base ; shaft robust. Length of spicule 'O^S mm., of larger 

 end '023 mm., length of smaller end •006 mm., width "OlO mm., 

 thickness of shaft "0083 mm. 



Esperella (f). — PI. X. fig. 11. Inequiaachorate with the large 

 end semi-elliptical, rounded above, lateral palms curved above, 

 sides nearly straight, tubercle distinct, pear-shaped, anterior 

 palm tongue-shaped. Smaller end of spicule subquadrate, with 

 nearly straight base, margins sliglitly revert, tubercle elongate, 

 anterior palm with curved uj)per margin extending across the 

 end. Length of spicule -06 mm., of larger end ^036 mm., width 

 •027 mm. Length of smaller end '01 mm., width •OlS mm., 

 thickness of shaft •OOS mm. Axial canal distinctly shown. This 

 form resembles the large inequianchorate in Esperella Simonis, 

 Eidley and Dendy (Chall. Eep. vol. xx. j). 73, pi. xv. fig. 16), from 

 Simon's Bay, at depths of 10-20 fathoms. 



JEsperella (g). — PI. X. fig. 12. Inequianchorate with the 

 larger end semi-elliptical in outline, lateral palms evenly curved, 

 margins revert, rounded inferiorly, tubercle diamond-shaped, 

 distinct ; anterior palm short, but doubtful if it is complete. 

 Small end of spicule with slightly curved base, narrower below, 



