666 
PROTOZOA. 
14. Axinellida. Echiuated with “proper’’ spicules projecting from 
the interior of the fibre. 
VI. Holorhaphidota. Fibres of the skeleton almost entirely com- 
posed of “ proper ” spicules bound together by a minimum of sarcode ; 
form of spicules variable, 
15. Renierida. Spicules more or less arranged in a fibrous form ; 
structure yielding to pressure like the crumb of bread. 
IG. Suherilida. Tissue chiefly cork-like ; spicules matted felt-like 
cancellous and crushable, or radiated compact and hard ; spicule chiefly 
pin-like, with the sharp ends projecting from the velvet-like surface. 
17. Pachytragida. More or less corticate, with a cancellous, more or 
less radiated structure, internally well differentiated. 
18. PacTiastrellida. No cortex; densely spiculiferous, even to stony 
hardness ; structure confused, no fibre. 
19. Potamos^ongida. Fragile freshwater sponges, bearing seed-like 
statoblasts. 
VII. Hkxactinellida. Skeleton charged with proper spicules of the 
sexradiate type. 
20. Vitreo-hexactinellida, Fibre vitreous spiculiferous. 
21. Sarco-hexactinellida. Sarco-spiculiferous. 
22. Sarco-vitreohexactinellida. Partly fibro-vitreous, partly sarco- 
spiculiferous. 
VIII. Oalcarea. Calcareous spicules only. 
In the introduction to the 3rd volume of the “British Sponges” (1), 
Bowerbank communicates the results of his examination of some type 
specimens of Oscar Schmidt’s genera and species of Adriatic sponges. 
Suherites massa, S. domunculus, “ Taguilla^' nigricans, and “ Tapiliata^^ 
suberea (?), belong to Hymeniciadon ; Stelletta discophora and Caminus 
vulcani to Pachymatisma ; Reniera digitata, aquccductus, and nigrescens, 
and Axinella verrucosa are Halichondrice \ Reniera semituhulosa (?),pal- 
mata, Axinella poly poides, Stegrella'^* saccea, and Crihrella hamigera are 
IsodictycB ; Reniera dura {densa) belongs to Desmacidon ; Esperia tuni- 
cata and bowerhanhi to Raphiodesma j Cacospongia mollior, Spongia 
nitens, Spongelia pallescens, and Sarcotragus spinulosus are true Spongia^, 
while Cacospongia scalaris and Aplysina aerophoha, are referred to 
V'erongia, Stelletta pumex to Tethea, Clathria oroides and coralloides to 
Ophlitaspongia^ Hircinia variahilis to Stematumenia. Gummina is “ appa- 
rently not a sponge.” 
In the first 70 plates, and in some of the following of this work (1), 
figures are given of a great number of species described in vol. ii. Some 
species are now referred to other genera, e.g., Hymeniacidon lingua and 
Jioridum to Raphiodesma, g. n., //. jecusculum and plumosum to Micro- 
ciona^ H. hucldandi to Battershyia, g. n., Halichondria hyndmanni to 
Isodictya^ Chalina seriata to Ophlitaspongia. A few are withdrawn 
{Microciona carnosa — M. piumosa, Isodictya rohusta = Desmacidon jef- 
* The Recorder is unable to find such names as Taguilla, Tapiliata, or Ste- 
grcUa, in Oscar Schmidt's monographs of the sponges ; perhaps Papilina and 
Slelktta aye intended. 
