REPORT ON THE TETRACTINELLIDA. 
Ixxiii 
A ffiUation of the principal foi'ins of Spicules in the Desmospongise. 
Calthrops Tetracrepid desmas Monocrepid desmas 
I 
Triaenes Candelabras Asters 
I 1 
I 
Microrabds Sterrasters Microcaltbrops 
I I 
I 
Rbabdi — Styles Asters Chelae Centractinate sigmas 
1 ^1 
I 
Microrabds Spirasters Sigmas 
I ^ ^1 
1 
Spires 
I 
Globules 
A filiation of the Spires. , 
Toxas Toxaspires Sigmas 
Sigmaspires 
Affiliation of the Asters. 
Amphiaster Sterraster Microrabd Sanidaster 
I ^ ^1 
I . 
Oxyaster (?) Cbiaster— 
Metaster (?) 
i L__ 
. I 
Spiraster 
Affiliation of the Trisenes. 
Dicbotriaenes (Tricbotriaenes) PbyUotriaenes Discotriaenes 
P lagiotriaenes Ortbotriaenes 
Protriaenes Anatriaenes (Ampbitriaenes ?) 
Microrabd 
Antbaster 
Ampbiaster 
Oxytylotes 
(ZOOL. CHALL. EXP, — PART LXIII. — 1888 .) 
Err k 
