178 BULLETIN OF THE BUREAU OF FISHERIES. 
Pirate LXI. 
Fig. 24. Phoriospongia osburnensis. Sponge incrusting on alcyonarian. % 1. 
Fig. 25. Phoriospongia osburnensis. From a section through the incrustation, vertical to the surface. 
Alcyonarian colony cut twice. X 28. 
Fig. 26. Lissodendoryx carolinensis. Whole sponge. X 34. 
Fig. 27. Lissodendorynx carolinensis. Papilla. 1s. 
Fig. 28. Lissodendoryx carolinensis. Interior of sponge. From a section vertical to the surface. 15. 
Pirate LXII. 
Fig. 29. Phleodictyon nodosum. X i. 
Fig. 30. Phleodictyon nodosum. ‘Transverse section of a fistula. 37. 
Fig. 31. Microciona prolifera. From a longitudinal section through a branch of the sponge shown in 
fig. 35. X 50. 
Fig. 32. Phleodictyon nodosum. Ectosomal skeleton of fistular wall as seen in a surface preparation. 
Beneath the fine dermal reticulum appear the fibers. X 21. 
Fig. 33. Microciona prolifera. From a transverse section through a branch of the sponge shown in 
Bigvsgen ers 
Fig. 34. Axinella acanthifera. Whole sponge. X 1. 
Pirate LXIII. 
Fig. 35. Microciona prolifera. Older, branched, form.  X 1. 
Fig. 36. Microciona prolifera. Incrusting specimen, with lobes; on oyster shells. 1. 
Fig. 37 Acanthella corrugata. Whole sponge, viewed obliquely from above.  X 1. 
Fig. 38. Axinella acanthifera. Transverse section of lobe showing axial skeleton and radiating fibers. 
X 15. 
Fig. 39. Axinella acanthifera. Longitudinal section through subcylindrical lobe, including both sur- 
faces.  X 21. 
Pirate LXIV. 
Fig. 40. Pleraplysilla latens. Thick section through the sponge, vertical to the surface. Only the 
more superficial part of the sponge appears distinctly. Three fibers are seen to terminate in 
conuli. The transparent area between two of the fibers is a large canal extending radially 
inward from just below the surface. The large flagellated chambers are shown. X 50. 
Fig. 41. Hircinia ectofibrosa. Whole sponge. 2%. 
Fig. 42. Aplysilla longispina. Part of the surface. 114. 
Fig. 43. Hircinia ectofibrosa. Skeleton as seen in a macerated slice, vertical to the surface; principal 
fibers and connectives showing. The maceration was carried too far, and the superficial 
skeleton was injured. Xo. 
Fig. 44. Hirciniaectofibrosa. From asection radial to the surface, showing a principal fiber with attached 
connectives. X38. 
Pirate LXV. 
Fig. 45. Aplysilla longispina. Section vertical to the surface and through a conulus. A fiber is seen 
terminating in a conulus. The flagellated chambers are shown in the interior. ar. 
Fig. 46. Acanthella corrugata. Section vertical to the surface and radial to the margin; including margin 
and both surfaces of the sponge. X21. 
Fig. 47. Acanthella corrugata. From a section vertical to the surface and radial to the margin; below 
extreme marginal region. Mesial part of lamella and one surface are shown. X21. 
Fig. 48. Aplysilla longispina. Surface view of dermal membrane. Preparation photographed in 
water. X21. 
Pirate LXVI. 
[All figures reduced in reproduction to one-third original size.] 
Fig. 49. Spirastrella andrewsii. a, b, c, megascleres, 385; d, spirasters, 1,380. 
Fig. 50. Cliona celata. Tylostyles. 385. 
Fig. 51. Poterion atlantica. a, b,c, tylostyles. 385. 
