AN ENTOPROCTAN POLYZOON (BARENTSIA BENEDENI). 



845 



from careful examination of many calyces, that the same transparent, membranaceous, 

 muscle-bordered termination of the wall of the calyx occurs in this species also. 



' (c) Dimensions of Species and Forms considered. 



Stalk, length ..... 



,, ,, of internodes, 



,, ,, of muscular expansion 



,, diameter of muscular expansion 

 „ ,, of rigid portions 



Calyx, diameter of lophophore . 

 ,, length of tentacles 

 „ ,, to edge of lophophore 



,, diameter of body . 



Thickness of chitin in stem 



Hull 



Specimens * 



(Barentsia 



benedeni). 



1 J, rarely 2 mm. 



0-28 -0-64 „ 



0-14 -0-36 „ 



0-09 -0-15 „ 



0-033-0-066 „ 



0-22 -0-27 „ 



0-15 -0-17 „ 



0-14 -0-15 „ 



0-10 -0-11 „ 

 2-5 -4/* 



Barentsia 



benedeni from 



Ostend. 



up to 3 mm. 



0-25 -0-39 mm, 



0-25 -0-32 „ 



0-08 -0-12 ,, 



0-045-0-057 „ 



1 



1 



0-23 -0-52 „ 



0-19 -0-46 „ 

 4-5 -7/x 



Barentsia 

 gracilis from 

 Calf of Man. 



about 1 mm. 



0-36 -0-43 mm. 

 0-075-0-135 „ 

 0-054-0-060 „ 

 0-016-0-030 „ 



1 



1 

 0-165-0-210 „ 

 0-159-0-180 „ 

 2 -2-5/* „ 



Barentsia 



belgica = gracilis 



from Ostend. 



up to 1J mm. 

 usually smaller \ 

 0-31 -0-84 mm. 

 0-12 -0-24f „ 

 0-05 -0-12f „ 

 0024-0-036 „ 



1 



1 

 0-19 -0-31 „ 

 0-14 -0-24 „ 

 1-5 -2fx. 



* The dimensions of the parts of the calyx were measured on living specimens. 



t Basal expansion. 



t Height 4 mm. according to Loppens (op. cit., p. 300). 



(d) Table of Synonyms. 



Synonymy of Barentsia gracilis (Sars). 



Pedicellina gracilis, Sars, Beskr. og Iattag., 1835, p. 6, pi. i. fig. 2a, b. Id., Johnstone, 

 British Zoophytes, 2nd ed., 1849, p. 385. Id., Hincks, Ann. Nat. Hist., ser. 2, 

 vol. viii. p. 360, pi. xiv. fig. 9. Id., Hincks, British Marine Polyzoa, 1880, p. 570, 

 pi. lxxxi. figs. 4-6. Id., Hilgendorf, Trans. N. Zealand Inst. (N.S.), vol. xxx., 

 1898, p. 218, pi. xxii. figs. 1, la, lb; and others, 

 var. nodosa, Lomas, Proc. Lit. Phil. Soc. Liverpool, No. xl., 1886, p. 190, pi. iii. 

 fig. 2. 



Forbesia gracilis, Goodsir, Ann. Nat. Hist., vol. xv., 1845, p. 380, pi. xx. fig. 4. 



Pedicellina belgica, van Beneden, Nouv. Mem. Acad. Eoy. Belgique, t. xix., 1845, 

 p. 23, pi. i., ii. Id., Foettinger, Arch. Biol., t. vii., 1886, p. 299 et seq., pi. x. 

 figs. 8, 16, 23, 25. Id., Loppens, Ann. Soc. Roy. Zool. Malac. Belgique, t. xli., 

 No. 3, 1906, p. 300. 



Ascopodaria gracilis, Busk, Challenger Rep. : Zool., vol xvii., Polyzoa, p. 42 ; Ehlers, 

 Abh. Kon. Ges. Wissens. Gottingen, Bd. xxxvi., 1890, p. 142. 



Ascopodaria belgica, Ehlers, ibid., p. 143. 



Gonypodaria nodosa, Ehlers, ibid., p. 144. 



Barentsia gracilis, Harmer, Cambridge Nat. Hist, 1896, p. 488, footnote. 



Barentsia nodosa, Harmer, loc. cit. 



