.'562 ]\[r. H. J, Garter on the Hexactinellidffi. 



Species solid, not excavated, provided with ancliori^uj-spicuhs and a 

 jlesh-spicule, which is hirotidate. 



Birotulate spicule consisting of a straight subspined shaft 

 terminated at each end by eight separate recurved blades 

 (fig. 21) ; or sometimes four- and six-armed, with as many- 

 heads, thus assuming the form of a rosette (fig. 22) ; or without 

 heads, and covered throughout or at the extremities with a 

 number of short vertical spines. 



Anchoring-spicules of two kinds, viz. smooth and spini- 

 ferous, twisted into the form of a cord which runs through the 

 head. Free terminations of the spicules unknown. 



Eyalonema Sieholdii^ Gray. Japan. (24) 

 lusitamcumj Socage. Portugal. (25) 



Species more or less globular, excavated, provided ivith anchoring- 

 spicules, and characterized by the birotulate Jlesh-spicide above 

 mentioned. 



Anchoring-spicules of two kinds, viz. smooth and spini- 

 ferous, the latter terminating at its free extremity in a recurved 

 double hook ; termination of the former unknown. 



Holtenia Carpenteri^j. Thomson. Sea south of Faroe 



Islands. (26) 

 Pheronema Annce^ Leidy. Santa Craz. (27) 



Grai/i, Kent. Portugal. (28) 



Meyerina claviformis^ Grray. Cebu, Philippines. (29) 



Species possessing the birotulate Jlesh-spicule in ivhich the terminations 

 of both himls of anchoring-spicides are knotvn. 



Free termination of spiniferous anchoring-spicule much the 

 same as that above mentioned ; ^termination of the smooth 

 anchoring-spicule consisting of a double hook or arm, opposite, 

 compressed, slightly recurved, and twice the size of the head 

 of the spiniferous form (PI. XIV. fig. 2). 



Labaria hemisphmrica^ Gray. Cebu, Philippines. (30) 



Spicules held together fn one part by vitrified fibre axd in the 

 other by amorphous barcode. 



Species tubular, unbranched, closed at the extremity. 



Body sarcospiculous ; lid vitreous. Provided with two kinds 

 of anchoring-spicules and two forms of rosettes, the same as 

 those of Eujjlectella aspergillum. 



Euplectella cucumer, Owen. Seychelles. (31) 



