Polyzoa of the Adriatic. 255 



Bange. Bahusia ; Southern Norway ; Britain (chiefly south 

 and west) ; Madeira. 



Family Eucratiidae, Hincks. 



EUCRATEA, Lamouroux. 

 Eucratea chelata^ Linnajus. 



On other Polyzoa. 



Range. Southern Norway ; France (south-west) ; Bay of 

 Cadiz ; Great Britain and Ireland (generally distributed) ; 

 Australia. 



Family Notamiidae, Hincks. 



Synnotum, no v. gen. 



Der. crvv, together, and vmrov, the back. 



Gen. char. — Zoarium consisting of erect, slender, bifur- 

 cating shoots, which are attached by a mass of tubular fibres 

 given oft' from the base of the primary cells. Zocecia in pairs, 

 joined back to back, each pair connected by tubular prolonga- 

 tions with the pair next but one below it *, elongate, expand- 

 ing from the base upward (of the Eucratean type), the front 

 occupied by a membranous area (aperture) ; sessile lateral 

 avicularia and an articulated avicularium between the cells in 

 each pair at the summit. Ocecium wanting. 



This extremely interesting form has been already described 

 and figured by Dr. Pieper f. He has referred it to the genus 

 Gemellaria, an opinion in which, after an examination which 

 proves to have been a very insufficient one, I fully concurred. 

 At the same time Dr. Pieper notes the presence of avicularia 

 and a peculiarity in the mode in which the pairs of cells are 

 connected as points which might prove to be of generic value. 

 He seems to have overlooked the fact (as I certainly did 

 myself) that the structure of the zoarium is essentially the 

 same as in Notamia, and that each pair of cells is united by 

 tubular prolongations, not with the next in succession, but 

 with the one below it, as in that genus. The zooecia of the 

 present form are of the Eucratean type and bear a close 

 general resemblance to those of GemeUaria ; they are also 

 placed back to back as in that genus. Dr. Pieper is quite 

 right in suggesting that Synuotum may perhaps be regarded 

 " als Verbindunffs-Glied zwischen GemeUaria und Notamia.^' 



* This clause is included in the family character, 

 t Jahvesber. Westfal. Prov. Ver. vol. ix. pp. 4.3-48, Taf. ii. 



18* 



