298 GASTEROPODES. 



The branchial apparatus is situate in the middle of the back. It seems 

 to consist of three quadripartite organs, surrounded by fourteen clavate 

 organs, of which latter the number is variable in different specimens. 



The predominant colour of the animal is bluish- white ; the whole 

 -parts, tips and stems, enlivened by vivid yellow belts and stains. 



The specimen represented spawned, on May 31, an irregular albu- 

 minous rope, extending nearly an inch, with pure white ova. Next day 

 another portion, considerably smaller, was produced. 



This is a beautiful animal, from the finely contrasted colours. It is 

 not common. 



PLATE XLII. 



FIG. 15. Doris (Ancitla) cristata, back. 



16. Belly, delineated after the specimen spawned. 



17. Tentaculum, enlarged. 



18. Pinnate portion of the branchial apparatus, enlarged. 



19. Rope of spawn. 



20. Portion of spawn, enlarged. 



5. DORIS CLAVIGERA The Club Doris. Plate XLII. Fig. 21. 



Length six lines ; breadth between two and three. General figure 

 tends to a long ellipse. The'body is wholly covered by tubercles and long 

 papillary processes ; the latter somewhat clavate, rough, and retractile. 

 The form of the head is elliptical, as crossing the direction of the body, 

 with a cylindrical white string from each side. A kind of flap, probably 

 the margin of a thin cloak, investing the body, projects over it. The 

 branchiaB, consisting of three pinnate organs, rise from near the middle 

 of the back. About twelve elongating papillary processes rise erect, near 

 the edge of the upper surface. The pinnate organs are all directed up- 

 wards, none of them downwards to the lower extremity. 



This is a very beautiful animal. The ground colour seems white ; 

 the whole prominences and elongations tipped with vivid orange or 

 yellow. It is rare. 



PLATE XLII. 



FIG. 21. Doris clavigera. 



