66 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Comantheria grandicalyx, Bonin Islands, 54-72 meters (68 arms 125 mm. long): 

 Length of ambulacral furrows 102.68 meters; weight 89.6 grams; volume 73.6 cc.; 

 specific weight 1.22; length of ambulacral furrows divided by volume 1.39. 



Comaster delicata grandis, Bonin Islands, 72 meters (46 arms 115 mm. long): 

 Length of ambulacral furrows 58.92 meters; weight 39.1 grams; volume 30.0 cc.; 

 specific weight 1.30; length of ambulacral furrows divided by volume 1.96. 



Comanthus parvicirra, Misaki, Japan, 0-3 meters (33 arms, 20 grooved, 50 mm. 

 long) : Length of ambulacral furrows 7.16 meters; weight 6.65 grams; volume 5.40 cc.; 

 specific weight 1.23; length of ambulacral furrows divided by volume 1.33. 



Catoptometra magnified minor, Kiu Sliiu, Japan, 900 meters (27 arms 95 mm. 

 long): Length of ambulacral furrows 34.50 meters; weight 6.70 grams; volume 5.42 

 cc. ; specific weight 1.24; length of ambulacral furrows divided by volume 6.37. 



Eudiocrinus loveni, Bonin Islands, 144 meters (5 arms 43 mm. long) : Length of 

 ambulacral furrows 2.47 meters; weight 0.65 grams; volume 0.47 cc.; specific weight 

 1.38; length of ambulacral furrows divided by volume 5.26. 



Heterometra crenulata, Cape Jaubert, Western Australia, 21 meters (30 arms 75 

 mm. long): Length of ambulacral furrows 43.05 meters; weight 11.55 grams; volume 

 8.28 cc.; specific weight 1.39; length of ambulacral furrows divided by volume 5.20. 



Lamprometra palmata, Trincomalee, Ceylon, 7 meters (43 arms 50 mm. long): 

 Length of ambulacral furrows 23.44 meters; weight 7.15 grams; volume 5.75 cc.; 

 specific weight 1.24; length of ambulacral furrows divided by volume 4.08. 



Cyllometra pulchella (=manca), Kiu Shiu, Japan, about 200 meters (14 arms 40 

 mm. long): Length of ambulacral furrows 6.02 meters; weight 0.72 grams; volume 

 0.60 cc.; specific weight 1.20; length of ambulacral furrows divided by volume 10.02. 



Tropiometra afra macrodiscus, Misaki, Japan, 0-3 meters (10 arms 255 mm. 

 long): Length of ambulacral furrows 47.69 meters; weight 39.8 grams; volume 34.4 

 cc.; specific weight 1.16; length of ambulacral furrows divided by volume 1.39. 



Aster 'ometra anthus, Bonin Islands, 207 meters (10 arms 70 mm. long): Length 

 of ambulacral furrows 10.60 meters; weight 3.12 grams; volume 2.34 cc.; specific 

 weight 1.33; length of ambulacral furrows divided by volume 4.52. 



Pectinometra flavopurpurea, Sagami Bay, Japan, 720 meters (20 arms 80 mm. 

 long): Length of ambulacral furrows 17.84 meters; weight 4.60 grams; volume 3.55 

 cc.; specific weight 1.30; length of ambulacral furrows divided by volume 5.02. 



Perissometra aranea, Kiu Shiu, Japan, 198 meters (11 arms 100 mm. long): 

 Length of ambulacral furrows 7.04 meters; weight 1.93 grams; volume 1.46 cc.; 

 specific weight 1.32; length of ambulacral furrows divided by volume 4.83. 



Antedon petasus, Kristineberg, Sweden, 30-40 meters (10 arms 110 mm. long): 

 Length of ambulacral furrows 16.28 meters; weight 2.63 grams; volume 2.29 cc.; 

 specific weight 1.15; length of ambulacral furrows divided by volume 7.10. 



Heliometra glacialis, East Greenland, 80-100 meters (10 arms 200 mm. long): 

 Length of ambulacral furrows 54.5 meters; weight 50.0 grams; volume 45.0 cc.; 

 specific weight 1.11; length of ambulacral furrows divided by volume 1.21. 



Gisl6n said that a glance at these figures shows at once that in the ratio between 

 the length of the ambulacral groove and the volume the average is much smaller 

 in the Comasteridae than in the other comatulids about 1.7 as against 5.0. 



