REPORT ON THE ALC YON ARIA. 31 



The spicules measure 0-5-0 -09 ; 0-67-0-04 ; 0-89-0-05 ; 0-4-0-06 ; 0-06-0 -01 5 mm. 

 Habitat. — Station 23, Sombrero Island ; depth, 450 fathoms ; bottom, Pteropod 

 ooze. 



3. Acanella chiliensis, n. sp. (PI. IX. fig. 3). 



Axis with root-like calcareous processes from base ; branches from horny nodes in twos 

 and threes forming irregular verticils ; calcareous internodes smooth. Colony from 10 to 

 12 cm. in height. Polyps prominent, arranged irregularly on the stem and branches. 

 Some about 5 mm. in height are almost sessile, others 7 mm. in height are slightly stalked. 

 Coenenchyma thin, with echinulate fusiform spicules. Polyps with fusiform spicules, 

 of which six or eight form a protective calyx below the imperfectly retracted 

 tentacles. 



Spicules of the coenenchyma are fusiform, some slightly curved, with spine-like 

 projections, some broad, fusiform, others slightly club-shaped. Those of the tentacles 

 small, irregular, dentate. 



The spicules measure 1-0-1 ; 1-5-0-2; 0-86-0-09; 0-36-0-05; 0-13-0-03 mm. 



Habitat. — Station 307, in the Messier Channel; depth, 175 fathoms; bottom, 

 blue mud. 



4. Acanella rigida, n. sp. (PI. IX. fig. 4). 



Colony about 14 cm. in height, bushy. Axis with calcareous root-like processes. 

 Branches from horny nodes, two, three, or four in number, forming verticils. Calcareous 

 internodes short near the base, long near the extremities of the axis and branches, 

 grooved. Axial coenenchyma thin. Polyps prominent, with broad bases, often at right 

 angles to the stem and branches ; rigid, with large, curved, fusiform spicules which are 

 twisted partly round the body of the polyp ; several of the larger of these form a pro- 

 tective calyx extending from the base of the polyp to a little beyond the base of 

 the imperfectly retractUe tentacles. 



Spicules very irregular in shape, large, some wavy in outline, others curved, or with 

 one end narrow and the other irregularly expanded, all with more or less well-developed 

 sprues. 



Some of the large, external, curved, spindle-shaped spicules surrounding the polyps 

 measure 3-5 mm. in length, with a diameter in the thickest portion of 1 mm., but others 

 measure 2-5-0-3 ; 2-0-0-1 mm. The spicules on the coenenchyma are much smaller 

 and less curved. 



The internal spicules measure -9-0-13 ; 0-87-0-07 ; 0-6-0-1 ; 0-8-0-08 ; 008-0-46 ; 

 0-25-0-04 mm. 



