420 



NAOKATSU VANAGI AND YAICIIIRO OK ADA : 



2. Colony unstalked Bueula. 



2. Colony stalked » 



3. Branches forming a tuft-like group at the upper end of stalk k'inetoskias. 



3. Branches arising at rather wide intervals Stirparia. 



Bugula Oken 181 5. 



Key to the species. 



I. Zocecia biserial 2. 



1. Zocecia multiscrial ij, 



2. Avicularia present ; 3, 



2. Avicularia absent a 



3. Zoœcial aperture with spines B. dentata, 



3. Zocecial aperture without spines B. s cap //aides, var. constricla. 



4. Zocecial aperture rounded above B. ioknstottice. 



4. Zoœcial aperture truncated above B. ncritiiia. 



5. Avicularia placed at base of the aperture 6. 



5. Avicularia placed half way between base and summit of the aperture 



B, pugeti, var. umbelliformis. 



6. Beak of avicularia with two rostra B. birostrata. 



6. Beak of avicularia with one rostrum ; 7. 



7. Zocecial aperture with robust spines, exceeding six in number B. /axa. 



7. Zocecial aperture with slender spuies, not exceeding six in number. . B. japomca. 



17. lingula birostrata, n. sp. 



PI, VI., fig. 10 ; textfig, 6. 



Zoarium forming a tuft of 30-65 mm. height, consisting of nume- 

 rous band-like and dichotomous branches ; most branches joined together 

 by fibres arising from indefinite parts of the colony. Zocecia multiserial, 

 slightly broader ?.bove than below, 3-5 or even 7-9 of them forming 

 an alternately interrupted transverse row ; their aperture occupying two- 

 thirds of the front, armed with numerous spines at margin : usually 

 7-9 spines on the outer and 4-5 on the inner border ; uppermost two 

 spines short, inconspicuous, situated close together ; the second spine on 

 each side somewhat broadened towards end ; all the remaining spines 

 pointed at end. Frontal avicularia occurring just below lower margin 

 of zoœcial aperture, conspicuously large, with tolerably long peduncle ; 

 their mandible relatively long and distinctly curved near the sharply 



