1.54 Mr. H. J. Carter on Specimens 



Fig. 23. TJioosa socialis, n. sp., spiculation of : a, sceptrelliform spicule ; 



&, compressed globular spicule (Sc. C). 

 Fig. 24. Dotona pidchella, n. sp., spiculation of: a } chief spicule ; 6, fine 



hair-like acuate ; c, flesh-spicule (Sc. C) ; d, portion of a, more 



magnified, to show by the dotted faint line on the opposite side 



that the apparent annulations form part of a spire. 

 Fig. 25. Aleetona Higgini, n. sp., spiculation of: a, chief spicule; b, fine 



hair-like acerate, subtricurvate ; c, flesh-spicule (Sc. C). 

 Fig. 26. Samus simplex, n. sp., spiculation of: a, lateral view of main 



spicule ; b, horizontal view of head (Sc. A) ; c, flesh-spicule 



(Sc. C). 

 Fig. 27. S. complicatus, n. sp. : main spicule, horizontal view, upperside 



(Sc. A). 

 Fig. 28. Tisiphonia annulata, n. sp., spiculation of : a, annulated quadri- 



radiate ; b, linear acerate (Sc. A) ; c, flesh-spicule spinispiru- 



late (Sc. C) ; d, portion of a, more magnified. 

 Fig. 29. Verticillately spined cylindrical spicule of unknown sponge 



abundant in excavated cavities of the Melobesian nodules 



(Sc. B). 

 Fig. 30. Pin-like spicule with spinated extremities and head turned to 



one side, of unknown sponge found in similar cavities of the 



Melobesian nodules (Sc. A). 

 Fig. 31. Geodia ramodigitata, n. sp., nat. size : a, zone-spicule ; b, body- 



spicule ; c, fork and anchor ; d, siliceous globules, round and 



oval respectively ; e, stellates of both localities, viz. external 



and internal (Sc. D) ; /, stellates, more magnified. 



Plate "VI. 



Fig. 32. G. perarmata, Bk. Section through the centre, nat. size : 

 a, dermal layer; b, interval between the dermal layer and 

 petrous crust ; c, petrous crust ; d, body or interior. 



Fig. 33. The same, spiculation of : a, zone-spicule ; b, body-spicule ; 

 c, fork and anchor ; d, siliceous globules, round and oval ; 

 e, external and internal stellates (Sc. D) ; /, more magnified 

 views of c, respectively. 



Fig. 34. The same. Dermal layer viewed from within : a, head of zone- 

 spicule ; b, pores in dermal layer, with stellates in the lower 

 half ; the latter represented by the dots( diagram). 



Fig. 35. The same. Vertical section of dermal layer, subdermal cham- 

 ber, and adjoining part of petrous crust: a, dermal layer 

 charged with stellates ; b, subdermal chamber or interval ; 

 c, part of petrous crust; d d, heads and adjoining shafts of zone- 

 spicules (diagram). 



Fig. 36. G. areolata, n. sp., spiculation of : «, zone-spicule ; b, body- 

 spicule ; c, fork and anchor ; d, siliceous globules, round and 

 oval ; e, external and internal stellates ; g, dermal acerate (Sc. 

 D) ; /, stellates, more magnified. 



lig. 37. The same, portion of surface, more magnified, to show areola- 

 tion and position of dermal acerates (diagram). 



Fig. 38. G. globostellata, n. sp., spiculation of : a, zone-spicule ; b, body- 

 spicule ; c, fork (no anchor seen) ; d, siliceous globules, round 

 and oval ; e, globostellate ; /, external and internal stellates 

 (Sc. D) ; g, more magnified view of e ; h, more magnified views 

 of/. 



Fig. 39. Stelletta tethyopsis, n. sp., torn off from the base (nat. size). 



Fig. 40. The same, spiculation of : a a, zone-spicule ; b b, body-spicule ; 



