CYCLOSTOMATA. CTENOSTOMATA. 
Moll 123 
hesia, Busk, as Discoporella), = Discoporella Jlosculus (Hincks), and 
regularis (Oi’b., Actinopora)^ British; Hincks, Brit, Polyz. pp. 473-480, 
pis. Ixviii & Ixiv. ligs. 4 & 5. 
Domopora stellata (Goldf., as Ceriopora) = Tuhidipora truncata (Flem., 
Johnst.), and truncata (Jameson, as Millepora^ Peach), British; id. 1. c. 
pp. 481-486, pi. Ixiii. figs. 5-14. 
Ceriopoeidj:. 
Heteropora (Blainv., nec Ehrenb.) : note on the history of this genus, 
and deceptive appearance of transverse dissepiments; A. W. Waters, 
Ann. N. H. (5) vi. pp. 156 & 157. 
Heteropora neozealanica (Busk) : its minute structure described by 
H. A. Nicholson, Ann. N. H. (5) vi. pp. 328-339, with several woodcuts. 
The tubes in the central portion are crossed by transverse calcareous 
plates or tabulae, the ‘‘ septa ” of Busk and Waters ; in the peripheral part, 
the thickened walls of the tubes are traversed by an exceedingly well- 
developed series of transverse canaliculi, which open into the cavities of 
the tubes by definite pores, and the tubes are intersected by numerous 
delicate spinules, which are arranged in a radiating manner, and reach a 
considerable distance into the body chamber, sometimes nearly to its 
centre. The author (pp, 414-423) compares this structure with that of 
the Silurian Monticulipora, and comes to the conclusion that there is no 
real relationship between them. Abstract in J. R. Micr. Soc. (2) i. 
p. 233. 
CTENOSTOMATA. 
Alcyonidiid.e. 
Alcyonidium mamillatum (Alder), disjunctum (Hincks), and mytili 
(Dalyell) = hexayonum (Hincks), British ; Hincks, Brit. Polyz. pp. 495- 
499, pi. Ixix. figs. 7 & 8, pi. Ixx. figs. 1 & 2, 3. 
Alcyonidium excavatum, sp. n., id. Ann. N. H. (5) vi. p. 284, pi. xv. 
figs. 8 & 9, Barents’ Sea. 
ARACENIDIIDiE. 
Arachnidium hippothooides and clavatum (Hincks), and fihrosum, sp. n., 
British ; Hincks, Brit. Polyz. pp. 508-511, pl. lxxi. 
Arachnidium simplex, sp. n., id. Ann. N. H. (5) vi. p. 284, pi. xv. figs. 
10 & 11, Barents’ Sea. 
FLUSTRELLIDiE. 
Flustrella hispida (Fabr., as Flustra ; Johnst., Alcyonidium), British ; 
Hincks, Brit. Polyz. p. 506, pi. Ixxii. figs. 1-5. 
1880. [vOL. XVII.] 
B 16 
