Classification of the Spong ida. 195 



Group 13. Clathrata. 

 For species see Part III. 



Group 14. Dictyalia. 

 For species see Part III. 



Family 4. Pseudochalinid a. 

 Group 15. Digitifera. 

 For species see Part III. 



Group 16. FlSTULODIGITATA. 



For species see Part III. 



Order V. ECHINONEMATA. 



Family 1. Ectyonida. 

 Group 1. Pluriformia. 



Ectyon sparsus, Gray, Proc. Zool. Soc. 1867, p. 515; Annals, 1871, 



vol. vii. p. 270, pi. xvii. fig. 1 &c. 

 Chalinopsis clathrodes, Sdt. 1870, Spongienf. atlant. Gebiet. p. 60. (A type 



specimen is in the British Museum.) 

 Agelas dispar, D. et M. op, cit. p. 76, pi. xv. figs. 1 & 2. 

 Clathria oroides, Sdt. (like Ectyon sparsus), 1868, Spong. Kiiste v. Algier, 



p. 9. (A type specimen is in the British Museum.) 

 JEchinonema typicum, C. MS. See Part III. ?=Tenaeia clathrata, Sdt. 



1870, op. cit. p. 56 (a type specimen is in the British Museum), 



? = Spongia cactiformis, Lam. 1816, Aniin. sans vertebr. p. 370. 

 Clathria compressa, Sdt. 1862, op. cit. p. 58, Taf. vi. fig. 1. 

 Dictyocylindrus ramosus, Bk. 1864, op. cit. vol. ii. p. 103, vol. iii. (1874), 



pi. xvi.,=zRaspalia, Sdt. 

 Spongia muricata, Esper, 1794, Taf. iii.,= Trichentrion muricatum, E. 



Ehlers (Prof. Zool. Erlangen), 1870, ' Esper'schen Spong. in der Zool. 



Samml. der k. Universitat Erlangen. 

 Acarnus innominatus, Gray, Proc. Zool. Soc. 1867, p. 544; Annals, 1871, 



vol. vii. p. 273, pi. xvii. figs. 4 &c. 

 For other species see Part III. 



Group 2. Plumohalichonbrina. 



Halichondria plumosa, Johnst. op. cit. p. 103, = Hymeniacidon plumosa, 

 Bk. Mon. Brit. Spong. cit. vol. ii. p. 195. 



Group 3. Microcionina. 



Microciona atrosanguinea, Bk. op. cit. vol. ii. p. 138, vol. i. pi. xxxiv. fig. 



369, =Scopalina, Sdt. 

 Halichondria maculans, Johnst. (Johnstonian Collection in the British 



Museum), =Hymeraphia stellifera, Bk. op. cit. vol. ii. p. 146, and 



vol. i. pi. xxxiv. fig. 370. 



