for the Microscope. 87 



with a short blunt spine at each corner. Common on 

 the fronds of seaweeds. (PI. VIII., fig. 10.) 



676. CAPSULAR HORNWRACK (Flustra avicularis). 

 About an inch in height, fan-like, of a greyish colour; 

 cells in four or five rows, oblong, with a spine at each 

 side of the opening, and a globose pearly capsule seated 

 between them. On old shells and zoophytes. 



677. BUGLE CORALLINE (Salicornaria farriminoides). 

 Erect, with forked branches; cylindrical, constricted at 

 the joints; cells lozenge-shaped, with a central opening. 

 On old shejls and zoophytes. (PI. VIII., fig. u.) 



678. WAVED BUGLE CORALLINE (Salicornaria sinuosa). 

 Resembling the last, but with the cells oblong, and the 

 apertures in the upper portion. Often mixed with the 

 preceding. 



679. FOLIACEOUS CORALLINE (Eschara foliacea). 

 Often of a large size, like a membrane twisted into wind- 

 ing folds ; light and crisp ; cells on both sides, opening 

 obliquely by roundish apertures. In deep water. 



680. The CRISTATELLA (Cristatella mucedo). In 

 colonies, of an oval shape, convex on the upper surface. 

 In ponds, creeping slowly over stones and aquatic plants. 

 Polyps in three concentric series around the margin. 

 Tentacula very numerous about eighty. 



681. The PLUMATELLA (Plumatella repens).' In ponds 

 and streams, attached to the underside of stones and 

 aquatic plants. Irregularly branched ; polyp-cells usually 

 single, sometimes in pairs along the branches. Tentacula 

 about sixty. 



682. The LOPHOPUS (Lophopus crystallinns). In 

 ponds, attached to aquatic plants. Colonies invested in 

 transparent gelatine, from which the polyps emerge as 

 from sacs. Tentacles numerous. 



683. SMOOTH ALCYONIDIUM (sucyonidium gelatinosuui). 

 A marine species, attached to shells and stones. Gela- 

 tinous, of a pale brownish colour, and very irregular 

 elongated form, six or more inches long. Polyps, with 

 sixteen tentacula, emerge from small orifices covering the 

 surface. 



