SP0NGJ2E. 
16 Spong , 
Ridley & Dendy (33) give the following classification of the Order 
Monaxonida in their Preliminary Report of the ‘Challenger ’ Sponges: — 
Order. Monaxonida. Siliceous Sponges with uni-axial skeleton-spicules. 
Sub-order 1. HaLICHONDKINA, Vosmaer. Non-corticate, skeleton 
reticulate, skeleton spicules acerates or acuate. 
Fam. 1 . Homorrhaphidce, R. & D. Skeleton spicules acerate to 
cylindrical ; no flesh spicules. 
Subfam. 1. Renierinat. Spicules never completely enveloped 
in horny fibre. 
Genus 1. Halichondria (Fleming), p. 326. II. solid a, 
n. sp., II. pelliculata, u. sp., II. lutrun- 
culiokles , n. sp. 
Genus 2 . Petrosia (Vosmaer), p. 326. P. similis, n. sp., 
P. truncata , n. sp., P. hispida , n. sp. 
Genus 3. Reniera (Nardo), p.. 327. R. subylobosa , n. sp. 
R. tufa , n. sp. 
Subfam. 2. Chalinincc. Spongin forming a thick sheath 
around the fibres. 
Genus 1. Pachychalina (0. Sdt.), p. 328. P. megalo- 
r aphis, n. sp., P. elongata, n. sp., P. (P) 
punctata , n. sp., P. pedunculata, n. sp. 
Genus 2. Dasychalina } u. g., p. 329. D.fragilis , n. sp., 
D. melior , n. sp., D. fibrosa, n. sp. 
Genus 3. Ohalina (Grant), p. 330. C. rectangular is, n. sp. 
Genus 4. Siphonochalina (O. Sdt.), p. 331. S. inter- 
media , n. sp., S. annulata. 
Fam. 2. Iletercrrhaphidce. Spicules of various forms ; flesh 
spicules commonly present, but never anchorates. 
Subfam. 1. Phloeodictyincc (Carter). Sponge divisible into 
body and fistula), with a strong spicular rind. 
Skeleton spicules acerate to cylindrical. 
Genus 1. Rhizochalina (0. Sdt.), p. 332. R. putridosa 
(Lamark ?). 
Genus 2. Oceanapia (Norman), p. 332. 0. robusta 
(Bwk.). 
Subfam. 2 . Gelliinoe. Skeleton spicules acerate. Flesh 
spicules present, viz., bihamates or tricurvates. 
No rind or fistula). 
Genus 1. Gellius (Gray), p. 333. G. carduus, n. sp., 
G. Icevis , n. sp., G. glacialis , n, sp., G. 
flagellifer, n. sp., G. calyx , n. sp., G. 
flabelliformis, n. sp. 
Genus 2. Gelliodes (Ridley), p. 334. G. poculum, n. sp. 
Genus 3. Toxochalina (Ridley), p. 334. T. robusta 
(Ridley). 
Subfam. 3. Tedania (Gray). Spicules acuate and cylindrical 
(the latter chiefly dermal), and long hair-like 
trichi tes. 
