312 General Notes. [ March, 
drawn to the fact that Gotte describes the epithelium of the so- 
called ambulacral groove of Comatula as being endodermal in 
origin. 
A third nerve-center is described as being present in the con- 
nective tissue, and as forming a pentagonal cord around the 
mouth. The lateral cords are connected by branches with one 
another at the angles of the pentagon, and they extend along the 
water-vascular system; each of these cords gives off lateral 
branches at regular distances, and these innervate the water-vas- 
cular system, and the papillae of the tentacles. Other well-de- 
veloped branches are also given off to the ventral integument ot 
the body, where they.are lost in a fine nervous plexus. Lud- 
wig’s view of the glandular character of the tentacles appears to 
be incorrect. They have 3-4 sensory hairs and a centrally-placed 
slowly-moving flagellum. From these observations it would fol- 
low that the tentacular papilla are complicated sensory organs.— 
Fourn. Royal Microscopicat Society, Dec., 1884. 
dia are “opisthobranchiate,” but so are Arion and Limax; in 
monata. The Onchidia are Pulmonata which have adapted them- 
selves to an amphibiotic or marine mode of life. — Fourn. Royal 
Microscopical Soctety, Dec. | 
| ZOOLOGICAL Notes.—Polyzoa—The Polyzoa of the Challenger 
Expedition have been described by ‘Mr. Geo. Busk, who finds 
that out of 286 species of Cheilostomatous Polyzoa, no less than 
_ 180are new. The Retepore alone have been raised from 31 to 
a 
