152 



T. GiSLEN, 



10 — 12 mm. The pait of the arm that supports the rudimentary pin- 

 nules 3 mm. The arms derived from IV Brax of very different lengths, 

 of. the table below: 



fill.. 3 + 4... 18 



III . . 3 + 4 



11 



IV.. 3 +4... 17 

 IV.. 3 +4... 13 



Br 1 2 3 + 4 ... !» 3 mm. 



Br 12 3 4 0,8 mm. 



Br i 2 3 + 4 ... 7 1,2 mm. 



1 Br 1 2 3 + 4 13 o.o mm. 



Pi (to the right on I Br 2 in 5 cases) 9; 5 mm., I^ 10; P3 10: 

 r'lVBr, 7; 2 mm. 



Disk coarsely granulated, with a long, plated anal tube. No 

 orals remaining. 



As is evident from the descriptions given above the number of 

 cirrals and cirri is to a certain degree proportional to the thickness of 

 the stem, that is to the age of the specimen. The different stages of 

 age that the present specimens I'epresent permit a rough estimate of 

 the L of the stem in a full-grown specimen. Sjjecimen 3 has a L oi the 

 stem of 295 mm. and an increase of 4,8 — 5,5 mm. of the stem-diameter. 

 Sp. 2 has a 240 mm. long stem and a diameter of 4,5 — 4,8 mm. .S^). 1 

 has a stem length of 275 mm. and a stem-diameter of 3,5 — 4,5 mm. In 

 Sj). S the stem on a L of 100 mm. has increased from 2,5^2,8 mm. 

 and in .S^). 9 from O.s — l.e mm. on a L of 100 mm. To judge from these 

 specimens the increase of the diameter of the stem is thus rapid to 

 1,5 mm. rather slow at about 2,5 mm., again somewhat more rapid 

 between 3,5 and 4,5 mm. retarded between 4,5 and 4,8 mm., and a little 

 faster between 5.o and 5,5 mm. Nevertheless there is a general de- 

 crease in the rapidity of the thickness-growth of the stem, i. e. younger 

 specimens grow faster, older ones usually more slowly. The total 

 length of the stem, jutlging from the above figures, might be between 

 i,5 and 2,0 metres. 



To the so-called nohllis-^vow^ Doderlein has assigned 4 species: 

 M. nohilis^ varians, siilnensis and sirperbus. I can here leave the two 

 last-mentioned ones out of the question, as they are well separated from 

 the 2 preceding species and from the above-described variety. Meiacri- 



