257 
the genus, which is followed by most authors, Selaginopsis is 
only based on the character, that the hydrothecae are arranged 
in more than two longitudinal series, and if an author were to 
institute a new genus for inst. for those species of the bryozoan 
genus Caberea, in which the zooecia present a similar arrangement, 
it would certainly be rejected as based on too feéble a foundation, 
but it would nevertheless possess this advantage over Selaginopsis, 
that its species would agree in all essential respects. Most species 
of the latter "genus" belong to Thujaria, but three must be 
referred to Sertularia, namely Sel. mirabilis Verr. (= Sel. Hincksi 
Mer.), Sel. ochotensis Mer. and Sel. (Pericladum) bidentata (Allm.)Y), 
and two to Diphasia, namely D. fusca (Johnst.) (== Thujaria 
salicornia Allm.) and D. Wandeli Lev. Perhaps the same is the 
case with Sel. Allmani Norman?) (= Sel. fusca Allm.) Also 
Sertularella is represented within Selaginopsis, namely by Sert. 
( Dictyocladium) flabellum Nutt. and Sert. (Dictyocladium) reticulatum 
Krp., which both satisfy the claims put upon the species of this 
"genus”, their hydrothecae being arranged in four longitudinal 
series, but they have by Allman?) been placed into another ar- 
tificial genus, Dictyocladium, which differs from Selaginopsis therein 
that the branches are anastomosing. While the hydrothecae of all 
the species hitherto named are provided with opercula, no opercula 
åre present in a number of other polyserial species, three of which 
have becn referred to Dictyocladium, namely D. dichotomum Allm., 
D. (Selaginopsis Jåd.) affine (Jåd.") and D. (Selaginopsis Jåd.) dicho- 
tomum (Jåd.5), and the same is the case with Selaginopsis pachy- 
clada Jåd.%) and with a number of species referred to the artificial 
genus Staurotheca Allm. Allman?) characterized the latter genus 
by the possession of opposite hydrothecae which are arranged in 
1) 2, p. 273, 
2) 42, 
DB 
1) 27, p, 38 and 59, p SST 
5) 26a, and 59, p. 382. 
S) 27å, p. 38. 
Vidensk. Meddel. fra den naturh. Foren. Bd. 64, 17 
