(I Si/fttcni itf ih( CftlcnrenuH Sjjongps. 185 



Genus 2G. Leucoxia, Grant. 



Gen. char. Persons of tlie stock uinted by tlic greater part 

 of their body-wall ; only their stomachal cavities and mouth- 

 openings separated. Mouth-openings simple, without pro- 

 boscis or peristomial crown. Five species. 



102. L. nivea, Bb. (Sj). nivea, Grant). British coasts. 



103. L. Gossei\ O. ^. {Leucoyypsia Gossei^^h.). Channel 



Islands. 



104. L. stilifera, O. S. Greenland. 



105. L. alqoensis^ H. {Leucogypsia afgoenfiifi, Bb.). Algoa 



106. L. sohda^ O. S. {Grantia sob'ckt, var. soct'ah'Sj 0. S.). 

 Dalmatia (O. S.). 



Order III. CCENGSYCA, H. 



Character. The mature calcareous sponge forms a cocnohinm 

 (a stock composed of several persons with a single common 

 mouth-opening). Body branched, with its branches every- 

 where coalescent and anastomosing, and finally running to- 

 gether into a single mouth-opening. (Rarely the persons also 

 grow together externally to form a massy lump, as in Cceno- 

 stoniella.) 



Family IX. Nardopsida, H. 



Character. The mature calcareous sponge forms a stock 

 with a single mouth-0])ening, the canal-walls of which are 

 only traversed by simple cutaneous pores (as in the Olynthida 

 and Soleniscida). 



Genus 27. Nardoa, O. 8. 



Gen. char. Mouth-opening simple, not produced into a 

 thinly membranous proboscis. Two species. 



107. N. guancha, H. {Guancha hla7ica, var. C, M.-M.). 



Lanzarote, (M.-M,). 



108. N. lacunosa, O. S. (Grantfa lacunosa, J.). British 

 coasts. 



Genus 28. *Nardopsis, nov. gen. 



Gen. char. Mouth-opening produced into a long thinly 

 membranous proboscis. Two species. 



109. *iV. gracilis, H. Australia. 



110. X. reticulum, O. S. (Nardoa reticuhim, O. S.). Dal- 



matia, O. S.) 



Ann. d; Mag. N. Hist. Ser. 4. TW. v. 1.3 



