6 THE IXORGANIC CONSTITUENTS OF MAIUNE INVERTEBKATES. 



confirmed by an analysis by O. Biitschli ^ of spicules from a Mediterranean sponge, Leucandra 

 aspera. His figures are as follows: 



CaCO, 86- 7C 



MgC03 6S4 



FeA 26 



CaS0j.2H,0 1-97 



n,0....: 3.14 



Organic matter 42 



99.39 



If we reject water and organic matter and recalculate to 100 per cent the percentage of 

 magnesium carbonate rises to 7.17. It seems probable, then, that the calcareous sponges are 

 distinctly magnesian, although more analyses are needed to establish the fact.' 



MADREPORARIAN CORALS. 



Madreporarian or stony corals have been repeatedly analyzed and with generally concord- 

 ant results. Twenty-eight of these corals were studied in the course of this investigation, 

 and with the results two old analyses made in the laboratory of the United States Geological 

 Survey may properly be included. The order of arrangement here is regional, for reasons 

 which will appear later, in our study of the alcyonarians. The list of corals analyzed is as 

 follows : 



1. BalanophylHii floridana Pourtal^s. South of Key West, Fla.; depth of wator, 165 meters. 



2. Paracyathus defilipii Duchassaing and Michelotti. South of Key West; depth, 165 meters. 



3. Dendrophyllia cornucopia Pourtal&s. Fish Hawk station 7286, Gulf Stream, off Key West; latitude. 24° 18' 00" 

 X.; longitude, 81° 47' 45" W.; depth, 243 meters; bottom temperature, 11.9° C. 



4. Siderastrea radians Pallas. Shoal water. Ragged Keys, Fla. 



5. Ponies ftircata Lamarck. Shoal water. Ragged Keys. 



6. Fai'ia fragum Esper. Shoal water, Tortugas, Fla. 



7. Exismilia aspera Dana. Shoal water, Tortugas. 



8. Oculina diffusa Lamarck. Shoal water, Tortugas. 



9. Cladocora arbuscula Lesueur. Tortugas; depth, 27.5 meters. 



10. Agaricia purpurea Lesueur. Reef, Loggerhead Key, Tortugas. 



11. Orbicella annularis Ellis and Solander. Reef, Loggerhead Key. 



12. Dasmosmilia h/mam Pourtales. Albatross station 2087; latitude, 40° 06' oO" N.; longitude, 70° 34' 15" W.; 

 ■('pth, 119 meters: bottom temperature, 10° C. 



13. Flabellumahbaslrum}.lose\ey. ^J6«(ro.M station 2677; latitude, 32° 39' N.; longitude 76° 50' 30" W. ; between 

 the Bahamas and Cape Fear; depth, 875 meters; bottom temperature, 4.5° C. 



14. Madrcpora /mlifcra Linne. Albatross stations 2662-2672, between the Bahamas and Cape Fear; depth, 512-894 

 meters; bottom temperature, 6°-7° C. 



15. Dendrophyllia profunda Pourtales. Locality, etc., as under No. 14. 



16. Miulracis decactis Lyman. Shoal water, Bermuda. 



17. Dcltocyalhus italicus Michelotti. Albatross station 27.50; latitude, 18° 30' X.; longitude, 63° 31' W.; dei)th, 

 908 meters; bottom temperature, 7° C. 



18. Acropora cervicornis Lamarck. Shoal water. South Bight, Bahamas. 



19. Orbicella cavernosa Linne. Reef, Light House Point, Andros Island, Bahamas 



20. Mscandra clivosa Ellis and Solander. Locality as under No. 19. 



21. Maandra labyrinthiformis Linn^. Reef, (iolding Cay, Andros Island, Bahama.'--. 



22. Mussa aff. .1/. di/isarea Dana. Reef, Golding Cay. 



23. I'orites clamria Lamarck. Reel, Ciolding Cay. 



24. I'orites aslreoidcs Lamarck. Reef, Ciolding Cay. 



25. Flabellum puvonium var. paripavoninuiii Alcock. Albatross station 4080; nortli (■c)a>t of Maui, Hawaiian Islands; 

 depth, 326 to 369 meters; bottom temperature, 13.5° C. 



26. Madracis kauaiensis Vaughan. Albatross station 3982; vicinity of Kauai, Hawaiian I.<lands; depth, 426-435 

 meters; bottom temperature, 9.1° C. 



5 Butschli, O., K. Gcsell. Wiss. Gottingcn Al)h., No. 3. 190S. 



« On mangane.-ic and iron in sponges, sec Cottp..!., Soc. biologic Cnmpt. rend., vol. 5.'), p. 139, 1903. Traces nf managanese were noted in our own 

 analyses. 



