464 
horizontally outwards, with their apices nearly touching the neigh- 
bouring brushes; seen from above the skeleton therefore appears 
as if it were reticulated with mostly triangular meshes, the sides 
of which are made up of small acanthostyles. The tylostyli are 
dispersed through the body of the sponge seemingly without order. 
Fig.l9. Microcionia novae- 
zealandiae nov. spec. a. 
Subtylostylote. b. Acan- 
thostylote. c. Tylostylote. 
d. Isochele. e. Smaller 
isochele. 
Fig. 20. Microcionia Iieterospiculata nov. spec. a. 
Spicula-tufts. b. Bigger acanthoslyli. c. Small 
acanthostylole. d. Subtylostylote. e. Front-, f. Side- 
view of isochelae. g—m. Various developmental 
stages of abnormal isochelae. 
Spicules. a. Megascleres. 1. Subtylostyli (Fig. 19a), with 
slightly spinous heads, a little curved, evenly tapering to the sharp 
points; 260—300X12 p. 2. Acanthostyli (fig. 19b), a little 
curved, of even thickness in the greater part, spined all over, ca. 
90—140X 11 p. 3. Tylostyli (fig. 19c), straight or nearly so, 
evenly tapering to the sharp points; heads sometimes rather feebly 
developed. 260X6 p. b. Microscleres. 1. Isochelae (fig. 19d), 
strongly curved, ca. 30—34 p. 2. Isochelae (fig. 19d), slightly 
curved, 10—18 p. 
