168 



DEPARTMENT OF. THE NAVAL SERVICE 



Grammaria ahiptina (Sars). 



Trophosome. Stem stout, irregularly branched; 

 branches constricted at the base, resembling the main 

 stem in all particulars; a large portion of the hydro- 

 theca extending beyond the outer tubes of the stem, 

 the free portion directed outwards; orifice nearly cir- 

 cular ; margin vertical. 



Gonosome. " Coppinia generally of an irregular 

 or oval form; all the tubes extending radially from it 

 bend at a certain distance from the surface in all 

 direxjtions, thus forming a network, lying like a capsule 

 outside the cluster of gonangia " (Eonnevie). 



No. 72. 

 Grammaria abieiina. 



Grammaria gracilis Stimpson. 



" Polypi dom slender, with a polished appearance; cells small, elongated, project- 

 ing, but curved inward at the extremities, and distant from each other in the very 

 irregular rows; colour dark l)rown, sometimes Vdaek '' (Stimpson). 



Genus Lafcea. ♦ • 



Trophosome. Mature stems strongly fascicled and erect ; young stems may be 

 simple and creeping; hydrothecae nearly always entirely free from the stem, never 

 immersed. 



Gonosomi'. ' A coppinia mass. 



KEY TO SPECIES. 



a No erect or fascicled stem. L. pygm'O'a. 



aa Stem when mature, erect, fascicled. 



b Hydrothecse sessile, sometimes slightly adherent at the base. L. dumosa. 

 hb Hydrotheca^ pedicellate.' 



c ITydrothecfe convex, convex side uppermost. 



d Hydrotheca? making an angle of less than 45° Avith the stem or 



branch, stem not distinguishable from branches. L. grarAIlima. 



dd Hydrothecff" maldng an angle of 4-5° to 60° with the stem, main 



stem distinct. L. frnticosa. 



cc Hydrothecae symmetrical. L. symmetrica. 



Lafoea dumosa (Fleming). 



Trophosome. Mature stem strongly fascicled, 

 erect, coarse, much branched; young stem either erect 

 or creeping over other h^droids; hydrothecse sessile, 

 usually free from the stem but occasionally those on 

 the distal part of the stem are slightly adherent. 



Gonosome. The gonangia of the coppinia mass, 

 as seen from the surface, are hexagonal, containing the 

 orifice at the centre; they are closely set out and the 

 elongated hydrothecfe come out at intervals among them. 



No. 73. 

 Laf'/a duviosa. 



