208 DR. HJNDE AND ME. HOLMES ON SL'ONaE-BEMAINS 



•023 mm,, length of small end "01 ; thickness of shaft '003 mm. 

 Only an oblique view of this form is kaown. 



Esperella (m). — PI. X. fig. 8. Inequianchorate with large 

 end triangular in outline, tubercle distinct, narrow, elongate ; 

 anterior palm short, truncate, not extending below the tubercle. 

 Small end rounded, central tubercle ovate. Length of spicule 

 •048 mm., of large end "028 mm., width '02 mm. Length of 

 small end '012 mm., thickness of shaft '0066 mm. 



PL X. figs. 9, 10. Lateral views of inequianchorates very 

 similar to the preceding (fig. 8). 



Esperella (n). — PI. X. fig. 16. Inequianchorate with large end 

 semi-ovate in outline, lateral palms evenly curved, rounded 

 inferiorly, tubercle elongate, anterior palm prominent, rounded ; 

 small end of spicule subangular, lateral margins oblique, widest 

 above ; tubercle elongate. Axial canal extending from upper 

 to lower tubercle. Length of spicule '036 mm., of large end 

 •021 mm., width of same "022 mm. Length of small end "Oil mm., 

 thickness of shaft '0045 mm. Similar but slightly larger spicules 

 occur in Esperella porosa, Ridley and Dendy (Chall. Eep. vol. xx. 

 p. 70, pi. XV. fig. 17), from Port Jackson, at depths from 30 to 

 35 fathoms. 



Esperella (o). — Pi. X. fig. 17. Inequianchorate with nearly 

 ovate large end ; lateral palms evenly curved with rounded bases, 

 tubercle diamond-shaped, anterior palm extending the full length 

 of the head. Small end of spicule semicircular ; tubercle ovate, 

 distinct. Axial canal connecting the tubercles. Length of 

 spicule '031 mm., of large end "021 mm., width "Oil mm., length 

 of small end '0053, thickness of shaft -0046 mm. Yery similar 

 spicules are figured by Mr. Carter in Esperia serratohamata 

 (Ann. & Mag. N. H. s. 5, vol. vi. 1880, p. 49, pi. v. fig. 20 d), 

 from the Gulf of Mauaar. 



Esperella (p). — PI. X. fig. 18. Inequianchorate with curved 

 shatt, large end with lateral curved palms, slightly extended 

 inferiorly, tubercle ovate. Small end with round tubercle and 

 lateral palms appearing as small knobs in the lateral position in 

 which the spicule is figured. Length of spicule '022 mm., of 

 large end "015 mm., width '01 mm. Width of small end '0075 mm., 

 thickness of shaft '0025 mm. 



Esperella (q). — PI. X. fig. 20. Only the lateral aspect of 

 this inequianchorate is known. The large end has the palms 

 curved and slightly extended inferiorly ; the small end viewed 



