REPORT ON THE HOLOTHURIOIDEA. 155 



Lcetmogone wyville-thomsoni, Thecl. 

 Fig. 14. Large wheel, seen from above ; diameter about 0'14 mm. 

 ,, 15. Small wheel, seen from above ; diameter 0'04 mm. 

 ,,16. Spicula from the ventral perisoma ; length about 0'38 mm. 



PLATE XXXII. 



Pannychia moseleyi, n. sp. 

 Fig. 1. Large wheel, from above ; diameter 0"24 mm. 



„ 2. The second stage in the devolpment of a large wheel, presenting the four- 

 armed crown already formed ; the ends of the arms are connected with one 

 another so as to give rise to a ring which becomes the nave. 



,, 3. The first stage in the development of a large wheel, showing a four-armed 

 spiculum, the arms of which grow larger and constitute the crown. 



,, 4. A later stage in the development of a large wheel, showing the nave nearly 

 fully developed ; the spokes are indicated by a series of outgrowths or 

 processes round the margin of the nave. The space enclosed by the dotted 

 lines marks a thicker portion, which is the centre of the growth of the 

 nave, and which doubtless is the original ring formed by the arms of the 

 crown which are being linked together. 



„ 5. Small wheel-shaped plate ; diameter 0'052 mm. 



„ 6. The central part of a large wheel, from above, showing that the large central 

 hole is covered with a very thin calcareous membrane, pierced by six 

 minute holes ; the dotted lines mark the crown composed of six arms, seen 

 through the thin membrane just mentioned. 



,, 7. Perforated plate from the dorsal processes ; diameter 0"092 mm. 



,, 8. Irregular, perforated plate from the ends of the dorsal processes ; diameter 

 0-092 mm. 



,, 9. Spicula from the ends of the dorsal processes. 



,,10. Spicula from the tentacles. 



,,11. Calcareous terminal plate from the ends of the pedicels. 



„ 12. Irregular net-shaped bodies, lying outside the former and evidently formed by 

 outgrowths of small wheel-shaped plates, which gradually change their 

 original form so that they finally vanish. 



„ 13. Calcareous network form the madreporic canal. 



Scotoplanes albida, n. sp. 

 „ 14. Straight, spinous spiculum measuring about 0'37 mm. ; and C-shaped bodies 



from 0"056 mm. to 0*1 mm. in length. 

 ,, 15. Spicula from the pedicels. 



