354 ME. G. BUSK ON THE SPECIES OE CELLEPOBA 



As only a single, small, rather worn specimen was in the col- 

 lection, the distinctness of this species must be regarded as 

 doubtful. 



20. C. vagans, n. sp.f 



Char. Zoarium incrustmg, dark olive-colour. Zocecia small, 

 with a single row of puncta round the border. Surface granular. 

 Primary orifice orbicular or subclithridiate. The peristome much 

 produced in front, with a wide sinus ; afterwards rising into a 

 hollow conical-pointed rostrum, which usually supports on one 

 side a minute avicularium with a semicircular mandible. Numerous 

 large interspersed avicularia, whose mandible expands at the ex- 

 tremity into three or four branches, connected by a delicate 

 membranous expansion, capable of being spread over foreign 

 bodies ; sometimes pointed, but always more or less membranous 

 towards the end. 



Hah. St. 148. Lat. 46° 47' S., long. 51° 37' E., 210 fins. 

 St. 260*. Off Honolulu, lat. 21° 11' N., long. 157° 25' W., 

 310 fins. 



The peculiarities of this species are : — 



1. The almost tubular production of the peristome, even in the 

 youngest zocecia seen. 2. The peculiar conical-pointed form of 

 the preoral rostrum, which sometimes represents merely an ob- 

 tuse tubercle, but is more commonly of an acute conical shape, 

 the apical portion of which, being denuded of the dark fuscous 

 epidermis, appears of an ivory whiteness, with a finely granular 

 surface and porcellanous aspect. 



The mode in which the partially membranous mandible of the 

 larger avicularia sometimes spreads like a webbed hand over 

 foreign bodies is very curious. In colour and superficial aspect 

 this form might be confounded with C. wiarnillata, but they are 

 quite distinct. 



Section III. 



21. C. bicoenis, n. sp.J 



Char. Zoarium globose. Zocecia ventricose below, becoming 

 tubular above. Orifice circular, notched ; peristome much raised, 

 tubular, and furnished in the perfect sterile zooecia with two 

 cylindrical preoral processes, having on their summits minute 

 avicularia, with an acute triangular mandible ; besides these pro- 



t " Chall. Eep." pi. xxix. fig. 10. J " Chall. Eep." pi. xxx. figs. 1 & 12. 



