CLASSIFICATION, DISTRIBUTION. 
jSpung. 21 
Fam. 4. Geodinidai. The characteristic spicule is the 
globate, the caual system is always aphodal, 
the cortex always well differentiated, the 
mesoderm of the choanosome a sarceuchyme. 
Genus 1, Erylus, Gray. Genus 2, Caminus, O. Sdt. 
Genus 3, Cydonium, Muller. Genus 4, 
Synpos, Yosmaer. Genus 5 , Isops, Sollas. 
Genus 6, Geodia , Lamark. 
Yejdovsky (39) gives the following classification of the freshwater 
Sponges of Europe : — 
Fam. Spongillid^e. 
Subfam. Spongillince , Carter. 
Genus. Spongilla. 
Subgenus. Euspongilla , Vejd. (1) E. lacustris, auct., 
(2) E. rhenana, Rotzer. 
Subgeuus. Spongilla. (3) S.fragilis, Leidy. 
Subfam. Meyenincc , Carter. 
Genus. Trochospongilla, Vejd. (4) T. erinaccus , Ehrbg. 
Genus. Epliydatia , Gray, nec Lamk. (5) E. mullein, Lie- 
berkuhn. (6) E. Jluviatilis, auct. (7) E. bohe- 
mica, F. Petr. 
Genus. Carterius, Potts. (8) G. stepanovii, Petr. (Dyb.). 
Yosmaer (41) gives a revision of the classification of the Ccilcarea, 
pp. 369-390. 
Distribution. 
Vosmaer (41) gives a general account of the distribution of Sponges. 
Jan Mayen. Marenzeller (23) : Gribrochalina ambigua, n. sp., 230 
metres, pi. i, fig. 1, p. 1 ; Desmacidon incrustans, Jnstn., strand S. side 
the Island, p. 1 ; Esperia constricta, Bwk., 90-400 metres, p. 2 ; Sube- 
rites lutlceni, O. Sdt., on the shore and 30 metres, p. 3, S. crelloides, 
n. sp., 230 metres, pi. i, fig. 3, p. 4 ; Tetilla geniculata, n. sp., 350-400 
metres, pi. i, fig. 4, p. 5 ; Thenea wallichii, P. Wright, 350-400 metres, 
p. 6 ; Sycandra utriculus, O. Sdt., 20-260 metres, p. 6, S. arctica, H., 
20-270 metres, p. 6. 
Koehler (16) describes the following from the Channel Is. (Note . — 
J. t= Jersey, G. = Guernsey, H. = Herm., S. = Sark.) Sycon ciliatum , 
H. (J. G. H. S.), S. tesselatus, Bwk. (G. H. S.) ; Grantia compressa, 
Flem. (J. G. H. S.), G. ensata, Bwk. (G.) ; Leuconia nivea, Gr. (J. S.) ; 
Leucosolenia contorta, Bwk. (S.), L. botrylloides , Bwk. (J. G. H.), L. 
lacunosa, Bwk. (G.) ; Leucogypsia gossei, Bwk. (S.) ; Geodia zetlandica , 
Jnstu. (S. ) ; Caminus osculosus, Grube (J. S.) ; Polymastia mammillaris , 
Bwk. (G.) ; Tethya lyncurium, Jnstn. (J. S.), T. collingsii, Bwk. (S.) ; 
Dictyocylindrus ramosus, Bwk. (J. G.) ; Microciona armata , Bwk. (J. 
G. ), M. atrosanguinea, Bwk. (S.) ; Hymeniacidon cavuncula, Bwk. (J. G. 
H. ), II. mammeata, Bwk. (J. G.) ; II. celata, Bwk. (J. G.) ; Halichondria 
