BELONGING TO THE GENERA FILIGELLA AND AGIS. 7 



tentacles. The lower one is also composed of the same number 

 of spicules, but these are arranged alternately with reference 

 to those of the upper ring. In all there are thus sixteen longitudinal 

 rows of the spicules. This arrangement seems to be peculiar to 

 this species. 



The spicules of the tentacle-base, forming a collaret, are ar- 

 ranged transversely in groups of three or four (PI. IL, fig. 11, 

 a). The spicule is straight or slightly curved, usually with 

 warts in its middle parts only. The measurements of six spicules 

 are as follows: 0.29x0.04, 0.33x0.03, 0.28x0.025, 0.32x0.04, 

 0.38x0.045, 0.3x0.03 mm. 



On the aboral side of tentacles there are from two to four 

 spicules, which are disposed longitudinally and cling to the col- 

 laret spicules with their externally curved lower ends (PI. 

 IL, fig. 11, b). Tlie warts are well developed in the middle 

 parts, especially on the under side of the curved parts, so 

 that it very often happens, that the warts come in contact 

 with the spicules of the collaret and give to the spicules an 

 almost scaly appearence. The upper end is straight or markedly 

 swollen and is provided with long foliaceous ridges. The meas- 

 urements of five spicules are as follows: 0.42x0.05, 0.38x0.04, 

 0.3 X 0.06, 0.31 X 0.04, 0.34 x 0.35 mm. Fig. 11 represents a typical 

 case of the spiculation of this region. 



The dorsal side of tentacles above the opercular spicules is 

 provided with spicules arranged in pairs forming two longitudinal 

 series (PI. IL, fig. 12, a-b). The first pair usually greatly exceed 

 other paris in size (0.2 mm. in length) ; they are straight or curved 

 and are sometimes provided with very well developed warts. The 

 rest of the pairs, on the other hand, become gradually smaller 

 towards the tip of the tentacle. On the dorsum of each pinnule is 



