(ill Bl l.l lll\ 82, UNITED STATES NATIONAL MUSEUM 



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



1I1 of ambulacra] furrows 102.68 meters; weight 89.6 grams; volume 73.6 cc; 

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



I - ddieata grandis, Bonin Islands, 72 meters (46 arms 115 mm. long): 



ill of ambulacra] furrows 58.92 meters; weight 39.1 grams; volume 30.0 cc.; 

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



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

 : Length of ambulacra] furrows 7.16 meters; weight 6.65 grams; volume 5.40 cc; 

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



Oatoptometra magnified minor, Kiu Shiu, Japan, 900 meters (27 arms 95 mm. 

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

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



ESudioerimu loreni, Bonin Islands, 11-1 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 furrow's divided by volume 5.26. 



Heterometra crenvlaia, 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. 



Cyllomctra 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. 



Tropiomctra ajra 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 



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



Aslerometra nnthus, 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. 



1'erissomelra 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. 



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

 Length of ambulacra] 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. 



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

 the length of the ambulacra] groove and the volume the average is much smaller 

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



