PLATE XXXI. 



All the figures of this Plate were drawn by me from living specimens in the Canary Island Lauzerote, 

 February 17-20, 1867. 



The characters have the same signification in all the figures : — 



na. Apical nectophore. 



nb. Basal nectophore. 



ni. Hydrcecial groove enclosed between two 



wings (ni, left whig ; nx, right wing). 

 np. Pedicle of the nectophore. 

 cp. Pedicular canal. 

 cs. Ascending pallial canal, 

 cs'. Descending pallial canal. 



cv. Ventral canal. 

 cd. Dorsal canal. 

 ex. Right canal. 

 cl. Left canal. 

 cc. Ring-canal. 

 a. Trunk. 

 w. Rubumbrella. 

 v. Velum. 



Praya galea, n. sp. (p. 146). 



Diam. 



Fig. 1. A complete living corm. The nectosome is composed of two large 

 opposite nectophores. The siphosome, in the perfectly expanded 

 state about two feet long, bears a series of forty to fifty cormidia, 

 separated by regular, equal, free internodes, . . . nat. size 



Fig. 2. The two nectophores, seen in their natural junction, from the dorsal 

 side of the first (smaller) bell. 



Fig. 3. The two nectophores, seen in their natural junction, from above (from 

 the apex). For "no" read " nb." 



Figs. 4a, 4b. The two nectophores, in the same view as in fig. 3, but separated 

 one from the other. The two lateral wings (nx right, nl left), which 

 arise from the ventral side of each bell, include an open hydrcecial 

 groove (ni), and in the median ventral line of this latter arises the 

 pedicle of the nectophore (np). 



Fig. 5. The first or apical nectophore, in lateral view (from the left side). 



Fig. 6. The second or basal nectophore, in lateral view (from the right side). 



Fig. 7. The second or basal nectophore, in ventral view (from the axial side). 

 The open hydrcecial groove is visible between the two ventral wings 

 of the bell (nx right, nl left wing). 



