160 
Plate IX 
Fig. 1. ScYLL^A PELAGicA, Linn c —Side view. Lobes con- 
tracted. X 3^ 
Fig. 2. Sycll^a pelagica, Zin?ie— Side view. Lobe.s expand- 
ed. X 2|. 
Fig. 3. St^urodoris ptjsttjlata, Abraham — Dorsal view. x3f. 
Plate X. 
Fig. 1. Pleurophyllidia cygnea, Bergh — Dorsal view. Ani- 
mal fnlly extended. Slightly enlarged. 
Fig. 2. Pleurophyllidlv cygnea, Bergh — Ventral view. Ani- 
mal partially contracted. Slightly enlarged. 
Fig; 3. Ceratosoma adelaid.t., spec. nov. — Dorsal view, x 10|. 
Fig. 4. Ceratosoma Adelaide, spec. iiov. — Dorsal view. x3|. 
Plate XI. 
Fig. 1. Pleurophyllidia cygnea, Bergh — Side view. Ani- 
mal contracted. Natural size. 
Fig. 2. Pleurophyllidia cygnea, Bergh — Front view. Ani- 
mal contracted. Natural size. 
Fig. 3. PLEUROPjtiYLLiDiA CYGNEA, Bergh — Ventral vieAv Ani- 
mal contracted. Natural size. 
Plate XII. 
Fig. 1. Kadula of PleuropnyUidia cygnea, Bergh, showing ar- 
rangement of transverse rows of teeth. 
Fig. 2. Rachidian cusp with its denticles, of the radula of 
P. cygnea 
Figs. 3 pnd 3a. Accessory nlates connecting the rachidian 
with the laterals of tUe radula of P. ry^jnea. 
Fig 4. Ijingual spines of P. cygnea — Exterior aspect. 
Fig. 5. Lingual spines of P. cygnea — Interior aspect. 
Fig. 6. INlandible of P. cygnea. 
