257 
the genus, which is followed by most. authors, Selaginopsis is 
onlj 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 feeble 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.) 1 ), 
and two to Diphasia , namely D. fusca (Johnst.) (= Thujaria 
sahcorma Allm.) and D. Wandeli Lev. Perhaps the same is the 
case with Sel. Allmani Norman 2 ) (= Sel. fusca Allm.) Also 
Sertularella is represented within Selaginopsis , namely by Sert. 
{Dietyocladium) 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 
seiies, but they have by Allm an 3 ) 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 
are present in a number of other polyserial species, three of which 
have beon referred to Dictyocladium, namely D. dichotomum Allm., 
D.(Selaginopsis JådJ affine (Jåd. 4 ) and D. {Selaginopsis Jåd.) dicho¬ 
tomum (Jåd. 5 ), and the same is the case with Selaginopsis pachy- 
clada Jåd. 6 ) and with a number of species referred to the artificial 
genus S taurotheca Allm. Allm an 3 ) characterized the latter genus 
by the possession of opposite hydrothecae which are arranged in 
*) 2, n. 273. 
2 ) 42. 
3 ) 5. 
4 ) 27 a, p. 32 and 59, p. 331. 
5 ) 26 a, and 59, p. 332. 
€ ) 27 a, p. 33. 
Vidensk. Meddel, fra den naturh. Foren. Bd. 64 . 
17 
