PLATE XXXIII. 



The figures of this Plate were drawn by me from living specimens in the Canary Island 

 Lanzerote, December 28-30, 1866. 



Diphyopsis compressa, n. sp. (p. 153). 



Fig. 1. A complete living corm, with expanded siphosoine. The first (apical) 

 nectophore is seen from its left side, the second (basal) from its 

 right side, cs, Somatocyst of the superior or proximal nectophore ; 

 cp, coryphal canal; w, suhumbrella ; ni, hydrcecium ; ub, ventral 

 face of the umbrella ; up, pedicle of the inferior or distal 

 nectophore ; nl, its overlapping left wing ; nd, dorsal edge, 



Fig. 2. The two nectophores, united, seen from the ventral side of the first. 

 cs, Somatocyst ; cp, coryphal canal ; w, subumbrella ; nf, hvdrcecial 

 canal (infundibular furrow) ; nf 1 , its superior fissure ; nf 8 , its inferior 

 fissure ; ni, hydrcecium of the first nectophore ; a, the included stem, 



Fig. 3. The two nectophores, united, seen from the dorsal side of the first. 

 Characters as in fig. 2. The second nectophore exhibits distinctly 

 the left mantledobe of its umbrella (nl) overlapping the inferior 

 part of the hvdrcecial canal, ..... 



Fig. 4. The basal (distal or second) nectophore, seen from its right side. 

 rep, Pedicle, with the apical canal (cp) ; nf 1 , superior, and nf 2 , 

 inferior fissure of the hvdrcecial canal ; w, subumbrella ; nd, odd 

 dorsal tooth ; n}-n 6 , three pairs of basal teeth, two of which 

 (n x -n 4 ) surround the ostium of the umbrella, 



Fig. 5. Apical part of the same nectophore, seen from its ventral side, 

 exhibiting the bridge (ub) between the two fissures of the 

 hydroecial canal (nf 1 , nf 2 ), and the overlapping left mantle- 

 lobe (nl), ........ 



Fig. 6. Basal ostium of the apical (proximal or first) nectophore, seen from 

 below; v, velum; nd, odd dorsal tooth; n 1 , left, rr, right, lateral 

 teeth ; n s , left, n 4 , right, ventral teeth ; cr, ring-canal, 



Fig. 7. Basal part of the same nectophore, seen from its dorsal side. Characters 

 as in fig. 6, ....... 



Fig. 8. Basal view of the same nectophore, exhibiting the rectangular mouth 

 of the hydrcecium or the infundibular cavity, in which is hidden 

 the contracted siphosome (a). Characters as in fig. 6. 



Diam. 



