18 MB. A. W. WAT.BBS ON BRTOZOA FROM RAPALLO 



up to the border, and six others of the same size farther removed, 

 making an irregular second row. On the lateral margins of the 

 zooecia there are about 10 delicate spiues, directed inwards towards 

 the median line, and 4-6 directed outwards. Dorsal surface 

 "with numerous spiues, and sometimes, but not always, a radical 

 tube starting from close to bhe proximal end. In Seania magel- 

 lanica this tube is almost central. The Chaunosia hirtissima of 

 Busk would seem to be the var. cylindrica, and I am not sure, 

 therefore, which variety was dredged by the ' Challenger ' at 

 Cape Verd Islands. 



Chlidonia Cordieri, Aud. (PI. 1. figs. 8 & 9.) 



Eucratea Cordieri, Aud. in Savigny''s ' Egypte,' p. 74 ; Waters, Bry. of 

 the Bay of Naples, Ann. Mag. Nat. Hist. ser. 5, vol. iii. p. 116, pi. xv. 

 figs. 9, 11, pi. xxiii. fig. 12. 



Cothurnicella daedala, TV. Thomson, Proc. Zool. Bot. Assoc. Dublin, 

 vol. i. p. 85, pi. viii. fifrs. 3-5, & Nat. Hist. Rev. vol. v. p. 146. 



Chlidonia dsedala, MacGilliv. Zool. Vict. dec. xi. p. 35, pi. cviii. fig. 2. 



Chlidonia Cordieri, Savigny's ' Egypte,' pi. xiii. fig. 3 {in text Eucratea) ; 

 D'Orbigny, Paleont. Frang. p. 40; Busk, 'Challenger' Report, p. 8, 

 pi. xxviii. fig. 11 ; Hincks, Ann. Mag. Nat. Hist. ser. 5, vol. xvii. p. 258 ; 

 MacGillivray, Cat. Mar. Polyz. Vict. p. 10. 



The stalk, consisting of calcareous cylinders connected by 

 corneous tubes, has a parenchym running through it, which in 

 each cylinder sends out a branch to an external disk (see fig. 8). 

 There are three other stalked genera, namely Bhahdopleura, 

 Kinetoshia, and Stirparia, but in none of them, so far as can be 

 judged from the descriptions, do the stalks resemble those of 

 Chlidonia. A fuller knowledge of the earlier stages of these 

 stalked species is much wanted, for of course these stalks are 

 quite different from the radicals thrown out by many species 

 of Bryozoa. In none of the species with stolons and stalks 

 do we know the form of the primary zooecium. The stalk 

 of Stirparia glabra (see opposite) has two interior chitinous cords 

 (woodcut fig. 3), which are formed by an internal thickening 

 of the chitinous wall, and the structure of the stalk in no way 

 resembles that of GTilidonia. 



Mhaldozoum can scarcely be compared with the other stalked 

 genera, as from the front of the zoarium a plain pedicular tube 

 is given ofi^, from which a fresh branch grows. In the stalked 

 specimens of RhaMozoum that I have examined many stalks 

 grow from one stolon. 



