482 H. V. Brøndsted. 



pijriformis only two sorts of spicules are found: 1°, Megascleres tijlostyles 

 (PI. XXVI, figs. 9—9 b) of a very elegant form; slightly curved, the greatest 

 thickness is about the middle, then gradually tapering to both ends; 

 very finely and quite near the end rather abruptly pointed; 0,60 — 

 0,43 mm. by 0,014—0,010 mm. 2°, Microscleres oxea, (PI. XXVI. fig. 10), 

 follow the tylostyles, spined, slightly bent, with a constant swelling 

 near the middle, form much varying; 0,020—0,055 by 0,002—0,003 mm. 

 Station 99. Lat. 77° N. Long, ll'k" W. 300 m. 



List of litterature. 



1. Arnesen, Emily: Spongier fra den norske Iwst. I. Calcarea. (Bestimmungstafel 



in deutscher Sprache). Bergens Museums Aarbog for 1900. Bergen 1901. 



2. — : Spongien von der norwegischen Küste. II. Monaxonida: Halichondrina. 



Berg. Mus. Aarb. for 1903. Bergen 1904. 

 3 a. BowERBANK, J. S. : Monogr. Brit. Spongiadae. I, London 1864. 

 3 b. — — — II, — 1866. 



3 c. — — — III, — 1874. 



3d.— — — IV, (Norman ed.) London 1882. 



4. Breitfüss, L. L. : Die arktische KalkscliAvammfauna. Arch. Natg. 64. Jahrg. 



Bd. L 1898. 



5. — : Kalkschwammfauna des Weissen Meeres und der Eismeerküsten des euro- 



päischen Busslands. Mem. de I'Acad. Imp. de Sc. de St. Péterb.s VIII sér. 

 Vol VL 1898. 



6. Brøndsted, H. V.: Porifera in Conspectus Faunae Groenlandicae. Medd. om 



Grønland XXIII. Kbh. 1914. 



7. Fleming, J.: A History of British Animals. Edingb. 1828. 



8. Fristedt, F.: Sponges from the Atlantic and Arctic Oceans and the Behring 



Sea. Vega-Exp. vetensk. laktt. IV, 1887. 



9. Grant, G. : Observations and experiments on the structure and functions of 



the Sponge. Edingb. New Phil. Journ. Vol. II, 1827. 



10. Gray, J. E.: Note on the Arrangement of Sponges, with the description of 



some New Genera. Proc. Zool. Soc, Ld. 1867. 



11. Haeckel, E.: Die Kalkschwämme I — III. 1872. 



12. Hansen, Armauer: Spongiadae. Den norske Nordhavs Exp. 1876 — 78. Kristiania 



1885. (Also English text). 



13. Johnston, I.: History of British Sponges and Lithophytes. Edingb. 1842. 



14. Kent, Saville: In Monthly Micr. Journ. Nov. 1870. 



15. Lambe, L. M. : Sponges from the AVestern Coast of North America. Proc. and 



Trans. Roy. Soc. Canada. XII. 1895. 



16. — : Sponges from tlie Atlantic Coast of Canada, ibid. Second Ser. Vol. II. 



Sect. 4, 1896. 



17. Lundbeck, W. : Porifera. Homorrhaphidae and Heterorrhaphidae. The Danish 



Ingolf-Exp. Vol. VI, Part 1. Copenhagen 1902. 



18. — : Porifera. Desmacidonidae. Pars. ibid. 1905. 



19. — : — — ibid. 1910. 



