<•>_> Bl 11.1 UN B2, 1 U I KI) STATES NATIONAL MUSEUM 



( bmamtht ria grand icalyj-, 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, diatomB, sponge Bpicules, bits of leaves (the largest 4.5 by 1.25 mm.), 

 bryo olitary holothurian anchors, a syllid (2.1 by 2 mm.) and a syllid larva, 



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



Con, catagrandu, Bonin Islands, 72 meters. The sample was taken directly 



Com the ini 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 Nitechia) were more abundant; otherwise this sample was like the other. 



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

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

 pods, ostracods, Foraminifera, and vcliger 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. 



Asteronutra anthns, 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 Gat. 79°30' N., long. 10°30' E.), 100 

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

 solitary ostracods, polynoid bristles, and one tintinnoid. 



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

 A sample of the excrement of Antedon petasus contained Adinocyclus crassus, Adino- 

 ptychua undulatvs, Biddulphia aurita, Campylodiscus thuretii, Cerataulus smithii, 

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

 tilhnu, Diploneia nUescens, Grammatophora marina, Hyalodiscus scoticus, H. stelliger, 

 ula cyprinvs, Paralia sulcata, Nitschia longa, N. seriata, Rhabdonema arcuatum, 

 R. minutum, Rhizosolenia sctigera, 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 (Rhopalodia) gibba, Grunoviclla marina, Grammatophora 

 1 /- lasira 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 Metacrimua rotundus contained Achnanthes mammalis, Actinocy- 

 clus tin nbi rgi, . ictinoptyeh >/■■< undulatus, Amphora costata, A. macilenta, Climacospnenia 

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

 radiaius, C. act ntrieus, C. curvatnlus, C. oculus iridis, Cydotella striata, Diploneis sp., 

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



