CLASSIFICATION. 
Spong . 19 
Genus 1. Suberites (Nardo), p.484. S. camina tu s, n. sp.,$. 
senilis , n. sp., S. perfectus , n. sp., axiatus, 
n. sp., S. durissimus, n. sp., S. mollis , u. sp., 
«S. elongata, n. sp., &. spiralis , n. sp., S. 
ramulosa, n. sp. 
Genus 2. Polymastia (Bwk.), p. 487. P. corticata, 
n. sp., P. agylutinans , n. sp. 
Geuus 3. Proteleia (Dend. & Rid.), p. 488. P. sollasi. 
Genus 4. Trichosienima (M. Sars), p. 488. T. sarsii , 
n. sp., T. irregularis , n. sp. 
Genus 5. Tentorium (Vosmaer), p. 489. T. semisube- 
rites (0. Sdt.). 
Genus 6. Stylocordyla (Wy. Th.), p. 489. S. stipitata 
(Crtr.). 
Genus 7. Quasillina (Norman), p. 489. Q. brevis (Bwk.). 
Genus 8. Gliona (Grant), p. 490. C. dissimilis, n. sp. 
Pam. 2. Spirastrellulce. With special flesh spicules, which 
chiefly form a dermal crust. 
Genus 1. Spirastrella (0. Sdt.), p. 490. S. massa, n. sp., 
S. solida , n. sp., S. papillosa, n. sp. 
Genus 2. Latrunculia (Bocage), p. 491. L. apiealis , 
n. sp., L. brevis , u. sp., L. bocagei , n. sp., 
L. ? acerata, n. sp. 
Sollas (36) proposes the following provisional classification of the 
Tetractinell'ula , based on a study of the material obtained by the ‘ Chal- 
lenger ’ : — 
Tribe 1. Tetractinellida, Marshall. Skeleton characterized by quadri- 
radiate spicules, or “ Lithistid ” sclerites. 
Order I. Choristida, Sollas. Quadri-radiate spicules are present, 
but not “ Lithistid ” sclerites. 
Order II. Lithistid a, Zittel. The chief skeleton consists of “ Li- 
thistid ” sclerites, articulated to form a consistent 
network. Quadri-radiate spicules may be present 
or not. 
Suborder I. Tetradina. The chief spicules of the choano- 
some are totrads, amphitetrads, candelabra, or 
modified trioena. 
Fam. 1. Plakinida, Schulze. The canal system is eury- 
pylous. Candelabra are present. 
Genus 1. Epallax , n. g. 
Pam. 2. Pacliastrellidai. The canal system is either eury- 
pylous or aphodal. The tetrads are simple. 
Pam. 3. Corticidce , Vosmaer. The canal-system is aphodal 
The characteristic tetrads are candelabra, 
or forks with trifurcate arms, or forks with 
the surface ornamented with spines, or amphi- 
tetrads. 
Genus 1. Thrombus , n. g. 
