226 



PERCY SLADEN TRUST EXPEDITION 



Twenty-five species are dealt with in the present contribution, of which nine appear 

 to be new. The hst is as follows : — 



Order TETRAXONIDA. 

 Sub-order Homosclerophora. 



1. Dercitopsis minor n.sp. 



2. 

 3. 



4. 

 5. 

 6. 



7. 



10. 

 11. 

 12. 

 13. 

 14. 



Family Plakinidae. 



Sub-order Astrotetraxonida. 



Family Pachastrellidse. 



Pachastrella tenuilaminaris (Sollas). 

 Yodomia perfecta n.sp. 



Family Stellettidse. 



Myriastra parva (Row). 



Myriastra cavernosa n. sp. 



Dragmastra lactea (Carter) var. mauritiana nov. 



lihabdodragma (n. gen.) conulosa (Kieschnick). 



Ecionemia oarteri Dendy. 



Ecionemia laviniensis Dendy. 



Aurora providentice n. sp. 



Aurora cribriporosa n. sp. 



Aurora rowi n. sp. 



AsUropus simplex (Carter). 



Jaspis johnstonii (Schmidt). 



15. Geodia auroristella n. sp. 



16. Erylus lendenfeldi Sollas. 



17. Erylus proximus n. sp. 



18. Donatia lyncurium auctorum. 



19. Donatia japonica (Sollas). 



20. Donatia ingalli (Bowerbank). 



21. Donatia seychellensis (Wright). 



22. Donatia stella-grandis n. sp. 



23. Chondrilla australiensis Carter. 



24. Chondrilla mixta Schulze. 



25. Chondrilla sacciformis Carter. 



Family Geodiidse. 



Family Erylidse. 



Family Donatiidse. 



Family Chondrosiidse. 



I am again indebted to the Trustees of the Percy Sladen Fund for financial assistance 

 in the preparation of illustrations, &c., and to Miss Deakin for much valuable help 

 rendered possible thereby, especially for her faithful and painstaking drawings of spicules. 



