| OCR Text |
Show 592 DR. R. V O N L E N D E N F E L D O N T H E SYSTEMATIC [Dec. 21, !Witb proper spicules in tbe supporting skeleton. 30. Without proper spicules in the supporting skeleton (31.) (With uniformly distributed skeleton - reticulation and not very large subdermal cavities. 32. QQ j The skeleton consists of a dense axial reticu- | lation and isolated fibres extending from this to tbe surface. Between these very extensive \^ subdermal cavities are situated (33.) on f With geinmulse; living in fresh water 37. Spongillidce. \ Without gemmulae 34. 'Without flesh-spicules: fibres of the supporting skeleton not spined 38. Homorhaphidee. 34. •{ Flesh-spicules sigmata or spiral; no chelae 39. Heterorhaphida. Flesh-spicules chelae; when absent, fibres of supporting skeleton spined 40. Desmacidonidce. (33.) No chelae 41. Axinellidce. (31.) 35. With small spherical chambers and opaque ground-substance 35. With large sac-shaped cbambers and transparent ground-substance (36.) j Without filaments in the ground-substance ... 37. \ With filaments in the ground-substance 38. „„ f Skeleton-fibres with thin axial canal 42. Spongidce. | Skeleton-fibres tubular, with thick pith 43. Aplysinidce. (38.) Skeleton-fibre with thin axial canal 44. Hircinidce I Skeleton-fibres with thin axial canal; reticulate 45. Spongelida. Skeleton -fibres tubular with thick pith; dendritic 46. Aplysillidce. No skeleton 47. Halisarcida. APPENDIX. LIST OF PUBLICATIONS RELATING TO THE SPONGES. (Explanations of the Abbreviations used are appended.) 1. .asiiarras, Claudius. nepJ ?wwv. Liber 8, Cap. 16. 2. Agassiz, Alexander. (On Hexactinellids.) Bidl. Mus. C. Z. 1868, p. 367 (1868). 3. Aldrovandi, U . De reliquis aninialibus exanguibus nempe de Mollibus, Crustaceis, Testaceis et Zoophytis libri quatuor. Bononiae, 1606. Fob (2nd ed. 1618; 3rd ed. 1623; 4th ed. 1642.) (1606-1642.) |
