Plate X. 



Page 

 Fig. i. Mycale ovulum O. Schmidt, a styli of different sizes, b three developmental forms, x 165, 

 c anisochelse palmatee of different sizes and with different dimensions of the parts, 

 front view and side view, d chela with almost uniform ends, e younger and older deve- 

 lopmental form, side view and front view, x 585 34 



— 2. Mycale thaumato chela n. sp. a styli, x 165, b anisochela palmata, front view and side view, 



x 585; c — g the peculiar anisochela, c side view, the axis to the right, d front view, 

 e from behind, f seen from the small end in optical section showing the tooth in front, 

 the iateral alse on each side, the ala of the axis behind, and in the middle the lower 

 part inscribed, this latter part seen with the highest focal distance, x 1400, g the chela 

 in side view, x 585 39 



— 3. Mycale titabans O. Schmidt, a styli of the large form, b styli of the small form, x 165, 



c — g chelse, c front view, d turned a quarter of a turning to the right, e turned a quarter 

 of a turning to the left, f larger chela in the same position as d, showing the serrated 

 expansion of the lower tooth, g larger chela, from behind, x 1000, h sigmata of differ- 

 ent sizes, plane and contort, x 380 41 



— 4. Asbcstopluma pennatula O. Schmidt, a — b styli from the axis, a of the slender, straight 



ones, b of the thicker, curved ones, c subtylostyli from the lateral branches, x 120, 

 d the head-end of two of the subtylostyli from the lateral branches, x 485, e finely spi- 

 nulous tylostrongyla of different sizes, from the stalk-coating, /one of the almost smooth 

 developmental forms, x 485, ^"the characteristic anisochela palmata, front view and side 

 view, // seen from the small end, x 1400, i anisochelse palmatse of the large form in 

 different variations, front view and side view, k— n seen from the small end, k with 

 irregularly split middle tooth, / regular, with intact middle tooth, m with a split lateral 

 tooth, n with regularly split middle tooth, x 585, o sigmata, x 700 44 



5. Asbcstopluma pennatula O. Schmidt. Transverse section of the axis, going through two 



lateral branches, in a place where these are short, the canals of the axis are seen, x 32. 44 



— 6. Asbcstcpluma pcnnatitla O. Schmidt. Transverse section of the axis some way below the 



lateral branches, showing canals and the stalk-coating, x 32 44 



— 7. Asbcstopluma pennatula O. Schmidt. Fragment of a transverse section through the thickened 



part of the stalk with canals and stalk-coating, a little diagrammatic, x 20 44 



