514 G. HERBERT FOWLER. 
EXPLANATION OF PLATE XXXII, 
Illustrating Dr. G. Herbert Fowler’s “ Notes on the Hydroid 
Phase of Limnocodium Sowerbyi.” 
Fic. 1—Two hydroids with a common base of attachment, of which that on 
the right is budding a medusoid at its apex. Under the action of staining 
and clearing reagents the polyps have shrunk away from the casing of vegetable 
particles. 
Fic. 2.—Colony of four individuals. At a, the gemmation of a medusoid 
was taking place. From the living specimen by reflected light. 
Fic. 3.—Hydroids ingesting a Nematode worm. 
Fie. 4.—Longitudinal section through a hydroid polyp, which is throwing 
off a completely formed bud on the right (ef. pp. 508, 509). 
Fie. 5,—Longitudinal section through the medusoid represented in Fig. 1. 
The various parts are named on Fig. 8, with the exception of two circular 
groups of 4—5 cells in the apparent centre of the preumbral lid; these 
are the endodermal cores of two of the supposed tentacles. 
In Figs. 5—9, the references are as follows.—c. Ceecal canals in the endo- 
dermal core of the manubrium. ec¢!. Ectodermal ingrowth for subumbrellar 
cavity. ezd’. Circular termination of the endoderm lamella, the site of the 
ring-canal. man'. Kndodermal core of the manubrium. @s, Gsophagus. 
p.c. Permanent ectodermal layer of the manubrium. pr. /. Preeumbral lid. 
7.¢c. Radial canal. s. ¢c. Excavation for the ultimate subumbrellar cavity. 
Fie. 6.—Quadrant of a diagrammatic section along the plane 6 in Fig. 8. 
Fic. 7.—Similar diagram of a section along the plane 7 in Fig. 8. 
Fie. §.—General diagram of the stage of medusoid formation, represented 
in Figs. 1, 5, 9. 
Fie. 9.—The next section to that drawn in Fig. 5; it passes to one side 
of the preeumbral lid. Camera drawing ; diagrammatically tinted. 
