32 



Schmarda's Hcmilepidia eiythrotcenia* is not a variety of tlie 

 same species. 



The example is a female with ova far advanced. 



The relationship of this species to the Polvnoc attenuata of 

 the "Challenger" expedition,! is so close, that it may be 

 necessary to unite them. The " Challenger " form was obtained 

 between tide-marks at Sea Point, near Cape Town, along with 

 Sabellaria, Tcrebella, and Sabella, and from its great length and 

 general appearance, it resembles a commensalistic form, 

 probably living in the tube of a Tcrebella. The two forms 

 agree in general outline of the body, and in the number of the 

 scales, those in the specimen from the " Challenger," however, 

 being more distinctly papillose, especially at the margin, yet, it 

 is only a question of degree. In the specimen from the 

 " Challenger," no large bristles, such as are figured in this 

 paper, were present, and the fact was commented on at the 

 time. Such may be a variation, or an exceptional condition, 

 for the other bristles closely correspond. 



Sthenelais boa, Johnston, 1833. 



1833. Sigalion boa, Johnston. Loud. Mag. Nat. Hist.vi,, 332, 



f. 42. 

 iS^g. Sigalion boa, Id. Ann., Nat. Hist, ij.,439, PI. xxiii. figs. 6-15, 

 1843. Sigalion Idnncv, H. Rathke. Nova Act, Acad. Caesar. 



Nat. Cur. xx., p. 150, Tab. ix., f. i — 8. 

 1 85 1. Sigalion Iduncv, Grube. Fam. Ann. p. 38. 

 1851. Sigalion 6ofl, Williams. Rept. Brit. Assoc. 1851, p. 201. 

 1851. Sigalion Idnnw, Sars. Nyt. Mag. Natur. xi. 3, p. 264. 

 1861. Sigalion Iditnce, Id. Vid. Selsk. Forh., 1861 (sep, 



copy), p. I. 

 1865. Sigalion Iduncv, Malmgren. Nord. Hafs.-Ann. p. 86. 

 1865. Sthenelais Idnnoe and S. boa, De Quatrefages. Ann. i., 



p. 276, 

 1865. Sigalion boa, Johnston. Cat. Brit. Mus., p. 124, pi. 13, f.6. 



1873. Sthenelais Idnnoe, Sars. Bid. Christ. Faun., p. 14. 



1874. Stiienelais boa, Mcintosh. Invert, and Fishes St. And., 

 p. 118. 



1875. Sthenelais Idnnoe, Ehlers. Ann. " Porcupine," 1869, 

 ibid., p. 18. 



1876. Sthenelais boa, Mcintosh. Trans. Zool. Soc. ix.. p. 390. 

 1876. Sigalion Idnna, Tauber. Ann. Danic. 83. 



1880. Sthenelais Iduncv, Langerhans. Zeit. f.w. Zool. xxxiii., 



p. 276, Taf. xiv., f. 6. 

 1883. Sigalion Idnnoe, Levinsen. Nord. Annul., p. 199. 



* Op. cit. p. 150, Taf. xxxvii., fig. 318. 

 t Op. cit. p. 120, PI. XV., fig. 2 ; PI. XX., fig. 9 ; PL \\(i., figs. 8 and 0- 



