^10 :\Ir. H. A. P.aylis on 



edge of ostium thit-k. Zooids 4*0 to 

 ^'O mm., blackisli, fadiiijr to pale 

 brown ; arms usually ti pairs soluliis. 



7. Colony bulky and massive, or small 



and lax if younp (r«r/^^•), tubes long, 

 common coeno'cial substance soft and 

 spongy ; ostium witbout a definite lip, 

 transverse or oblique, edge of ostium 

 thin. Zooids 4-0 to 7'0 mm., brownish 



or greyish ; arms usually 8 pairs .... iletisus (iiuludiug rti- 



[nts and ('f}nii<lerssoui). 



8. Colony diminutive, orange when fresh, 



})alo in alcohol ; ostia without definite 

 ip. Zooids 2"2 mm., pale ; arms .'3 

 pairs tndicm. 



II. Cavity of the coenoecium continuous, and occu- 

 pied in comnicMi by the zooids and their buds. 

 Crenrocium branching, with numerous spines. 

 Arms of zooids commonly with end-swellings 

 beset with refractive beads Demiothecia. 



a. Colony up to 200 or 2y0 mm. in height, 

 coenoicium amber-coloured or pale. 



9, 10, 11. Colony much branched. Zooids 



2"0 to 3*2 mm., crimson, brown, violet, 



or pale; arms .") or (> pairs. Species 



not easily distinguished, but lio/li/soui is 



somewhat more robust, and with larger 



zooids, than dodecalophus dixlccalophus, /loth/- 



[«)?/;, {iiiaqnatus = 

 [hodysoni), (ftjuatus. 



h. Colony diminutive and delicate, ccencecium 

 oranffe-coloured. 



r> 



12. Zooids 1-3 mm., orange-coloured, with a 



few tracts of black pigment ; arms 5 

 pairs, with end-swellings in buds. No 

 males known i/rncihs. 



13. Zooids blackish; neuter zooids 1 -3 mni., 



arms 4 pairs, no end-swellings; male 

 zooids with one pair of arms only, with- 

 out tentacl(>s, nunu'rous refractive beads. 

 No females known fiboi/ct. 



LV. — Observalious on the Genus CJrassicauda. 

 By H. A. liAYLis, M.A. 



(rublished by permission of the Trustees of the British Museum.) 



Two sets of s|)('tiiii(iis from Deception Island, Soutli 

 Slietlaiulp, kindly .sent, to tlie ]\luseun) recently by ]\Ir. A. G. 

 Bennett, tlirow intenj^ting fiirtlier iiglit on this little-known 

 gcnns ot Nematodes. Tiio lio.st, in botli these cascsj was the 



