62 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Comantheria grandicalyx, Bonin Islands, 54-72 meters. The sample was obtained 

 in the same way as the preceding. It consisted of detritus, threads of algae, small 

 grains of sand, diatoms, sponge spicules, bits of leaves (the largest 4.5 by 1.25 mm.), 

 bryozoans, solitary holothurian anchors, a syllid (2.1 by 2 mm.) and a syllid larva, 

 and a piece of a hydroid colony (length 5 mm., breadth of branches 0.15 mm.). 



Comaster delicata grandis, Bonin Islands, 72 meters. The sample was taken directly 

 from the intestine. It contained algal threads, numerous radiolarians, tintinnoids, 

 crustacean podiae, solitary diatoms, grains of sand, Foraminifera, bits of bryozoans, 

 and sponge spicules. In another sample from another specimen of the same species 

 taken at the Bonin Islands in 144 meters the diatoms (Planktoniella, Thalassiothrix, 

 and Nitschia) were more abundant ; otherwise this sample was like the other. 



Zygometra microdiscus, Broorne, Western Australia, from the shore. The sample 

 was taken from the anal opening. It contained grains of sand, diatoms, small cope- 

 pods, ostracods, Foraminifera, and veliger larvae. 



Tropiometra afra macrodiscus, Misaki, Sagami Bay, Japan, 2-3 meters. Two 

 specimens were dissected. The intestine was almost empty. There were incon- 

 siderable remains of grains of sand, crustacean podiae, and diatoms. In the gullet 

 were large parasitic myzostomes. 



Asterometra anthus, Bonin Islands, 180 meters. The sample was taken from the 

 intestine and contained detritus, radiolarians, solitary bits of crustacean podiae, 

 Foraminifera, and one Ceratium. 



Heliometra glacialis, west of Spitzbergen (lat. 7930' N., long. 1030' E.), 100 

 meters. The sample was from the intestine and contained numerous copepods, 

 solitary ostracods, polynoid bristles, and one tintinnoid. 



Dr. Astrid Cleve-Euler identified the diatoms in some of the samples given above. 

 A sample of the excrement of Antedon petasus contained Actinocyclus crassus, Actino- 

 ptychus undulatus, Biddulphia aurita, Campylodiscus thuretii, Cerataulus smithii, 

 Coscinodiscus excentricus, C. oculus iridis, C. sp. (with large meshes), Cocconeis scu- 

 tellum, Diploneis nitescens, Grammatophora marina, Hyalodiscus scoticus, H. stelliger, 

 Navicula cyprinus, Paralia sulcata, Nitschia longa, N. seriata, Rhabdonema arcuatum, 

 R. minutum, Bhizosolenia setigera, Trachyneis aspera, and the following Silicoflagellata: 

 Distephanes speculum and Ebria tripartita. 



The excrement of Comantheria grandicalyx contained Achnanthes longipes, Am- 

 phora sp., Actinoptychus undulatus, Coscinodiscus sp. (with large meshes), Diploneis 

 didyma, D. litoralis, Epithemis (Rhopalodid) gibba, Grunoviella marina, Grammatophora 

 marina, Melosira nummuloides, Orthosira splendida, Paralia sulcata, Trachyneis aspera; 

 there were many sponge spicules and star-shaped hairs. 



In the excrement of Comaster delicata grandis there were few diatoms, Asterolampa 

 marylandica var. major, Nitschia marina, Navicula lyra, all solitary, the silicoflagellate 

 Dictyocha fibula, and many radiolarians. 



The excrement of Metacrinus rotundus contained Achnanthes mammalis, Actinocy- 

 clus ehrenbergi, Actinoptychus undulatus, Amphora costata, A. macilenta, Climacospnenia 

 elongata, Cocconeis reticulata, C. dirupta, C. finmarchica, C. pellucida, Coscinodiscus 

 radiatus, C. excentricus, C. curvatulus, C. oculus iridis, Cyclotella striata, Diploneis sp., 

 Grammatophora oceanica var. macilenta, G. angulosa var., Isthmia nervosa fragments, 



