as Infusoria flagellata. 263 



animal in profile, showing tlie peculiar attitude and curve of the 

 flagellum (_;?), the narrow aperture (c^) of the calyx (c), and the 

 unilateral attachment of the retractor muscle (r) ; the pedicel 

 (pd) is just beginning to develope, 950 diam. Fig. 33^, a young 

 form partially emerged from the bottom of the calyx (c), the 

 latter contracted at the mouth (c^) and the flageUum (_/?) 

 forcing its way through, as is usual, in a loop, 950 diam. Fig. 

 33'=, the same as fig. 33», retracted to the bottom of the calyx (c) 

 and the aperture (c^) of the latter nearly closed, 950 diam. 



Mffs, 34, 35. Bicosoeca graeilipes, n. sp. Fig. 34, the longitudinal fuiTow 

 (ri) and the flagellum (Jl) next the eye, the lip {Ip) in the back- 

 ground, 1900 diam. Fig. 35, the body retracted to the bottom 

 of the calyx (c) and the flagellum beginning to uncoil, 950 diam. 



Fig. 36. Codonoeca costata, n. sp. The body seated in the bottom of the 

 pedicellated calyx (e), 950 diam. 



Figs. 37, 37*, 37*", 37*^, 37*^. Saljmigocca omphoridimn, n. sp. : all magnified 

 950 diameters. Fig. 37, an individual suspended freely in its 

 calyx (c, ci). The dotted lines indicate the attitude which the 

 collar (b) assumed for a while during the observation upon this 

 specimen. A pai-ticle of ffecal matter has just left the anus (a). 

 Fig. 37*, the lower part of the calyx filled by the body, the 

 upper part (c') free from the neck {{) of the animal, and the 

 membi-anous collar unusually narrowed. Fig. 37'', the calyx 

 mostly filled by the body, the head (i) bent to one side, and the 

 flagellum (Jl) in the act of expelling a particle of undesirable 

 matter. Fig. 37<', an empty calyx, slightly contracted in dimen- 

 sions. Fig. 37"^, the body contracted and filling the calyx, and 

 the membranous collar {b) partially retracted. 



Fiffs. 38, 39. Salpinyoeca gracilis, u. sp., 950 diam. Fig. 38, the body 

 retracted within the calyx (e, ci). Fig. 39, the same as fig. 38, 

 partially protruded from the calyx. 



Figs. 40-44. Leucosolenia {Grantia) botryoides, Bowrbk. Fig. 40, a 

 colony of sponge, natural size. Fig. 41, view of a profile sec- 

 tion of the monadigerous layer, the monads {md) closely packed 

 together, side by side, with the membmnous collar (&) and the 

 flagellum {Jl) projecting into the general cavity of the colony, 

 95 diam. Figs. 42, 43, 44, isolated monads with the mem- 

 branous collar (6) in various attitudes, 950 diam. See also 

 fig. 64. 



FHgs. 45, 46. Astasia trichophora, Clap. Fig. 45, a dorsal view, the mouth 

 seen through the head, and the guhernaclum (Jl^) in the back- 

 ground, 500 diam. Fig. 46, the body in an amoeboid, contorted 

 state, 500 diam. 



Figs. 47-63. Anthophysa MUlleri, Bory. Fig. 47, a colony of adults at- 

 tached to a single tubular branchlet or pedicel (pd) ; one of the 

 monads is in the act of passing a morsel into its mouth (??i), 950 

 diam. Fig. 48, a pair of adults seen in profile, 950 diam. Fig. 

 49, a pair of yoimg monads, one in profile and the other pre- 

 senting its narrow side, 950 diam. Figs. 50 & 51, different at- 

 titudes of the same monad as the one in profile in fig. 49, during 

 the iutroception of food, 950 diam. Figs. 52-61, to illustrate 

 the process of fissigemmation, 950 diam. Fig. 62, a piece of 

 a tubular branchlet like fig. 47 (pd), 1900 diam. Fig. 63, a piece 

 of a flat branch from an old part of the colony, 950 diam. 



Fig. 64. Leucosolenia botryoides, Bowerbk. A portion of the monadi- 

 gerous layer {ynd) seen through the spiculiferous stratum, with 

 the spicula next the eye, 500 diam. 



