1898-1902. No. 8.] BRYOZOA. 41 



39. Discopora pavonella, Alder. 



40. Porella saccata. Busk. 



40 a.* — — var rostrata, Hincks. 



41.* — plana, Hincks. 



42. — concinna. Busk. 



43. — acutirostris, Smitt. 

 44.* — alba, Nordgaakd, n. sp. 

 45. — proboscidea, Hincks. 



46.* — umbonata, Nokdgaard, n. sp. 



47. Escharoptis sarsi, Smitt. 



48. Monoporella spinulifera, Hincks. 



49. Escharella ventricosa, Hassall. 



50. — abyssicola, Nobman. 



51. — laqueata, Norman. 



52. — labiata, Boeck. 



53. Escharoides jacksoni, Waters. 



54. Smittina smitti, Kirchenpauer. 



55. — jeffreysi, Norman. 

 56.* — minuscula, Smitt. 



57. Bhamphostomella scabra, Fabr. 



58. — costata, Lorenz. 

 59.* — plicata, Smitt. 



60.' — hincksi, Nordgaard, n. nom. 



61.* — spinigera, Lorenz. 



62.' — ovata, Smitt. 



63. — radiatula, Hincke. 



64. — bilaminata, Hincks. 



65. — contigua, Smitt. 



66. Cellepora incrassata. Smitt. 



67. — ventricosa, Lorenz. 



68. Metepora wallichiana, Busk. 



69. Crista denticulata, Lamarck. 



70. Tubulipora flabellaris, Fabr. 



71. Idmonea atlantica, Forbes. 



72.* Biastopora obelia, var. arctica. Waters. 

 73. Lichenopora verrucaria, Fabr. 

 74.* — crasiuscula, Smitt. 



75. Alcyonidiwm mytili, Dalyell. 

 76.* — mamillatum, Alder. 



77. Bowerbankia imbricata, Adams. 



An asterisk before a name indicates that up to the present the 

 species has not been observed on Ihe Norwegian shores. The number 

 of such species makes up about one third of the whole. There is reason 

 to suppose that continued search would reduce this third to some extent; 

 but there would be almost sure to be a considerable remainder which 

 probably be sought for in vain on the Norwegian coast. When, on the 

 other hand, the higher latitudes of the arctic region are reached, the 

 number of species that are common to both increases and the resem- 

 blance between the east and west arctic Bryozoan fauna must be admitted 

 to be very great. There seems, however, to be a difference, and it 



