SUMMARY OF RESULTS. 
733 
were two hooks common to all Echiuri, but there were none at the posterior end, which 
was separated from the rest of the body by a ring of larger papillae, and ended in a point, 
on which was the anus. The ganglion w r ith nerves going into the anterior portion was 
clearly visible ; there were four ovaria. The animal is closely allied to Thalassema as 
well as to Echiurus , holding a median position between those two genera.” 
Surface Organisms. — The following species are recorded from the surface of the 
Arafura Sea : — 
Diatomacea:. — The following species of Diatoms were observed by Mr. Comber. 
Navicula di-dans, Ralfs. 
„ arenaria, Donkin. 
„ formosa, Gregory. 
„ bombus, Kutzing. 
„ nitescens, Raifs. 
„ aspera, Ehrenberg. 
,, „ var. intermedia , Grunow. _ 
„ ,, var. pygmsea, ( = Stauroneis 
pygmsea , Castracane). 
„ clepsydra , Donkin. 
Fleurosigma strigosum, W. Smith. 
,, japonicum , Castracane. 
,, elegantissimum, Castracane. 
„ macilentum, Peragailo. 
„ naviculaceurn , Brebisson, var. 
arafurensis, Castracane. 
Amphipr&ra alata, Kutzing. 
Nitzschia constrida, Gregory, and forma parva. 
„ mammalis, Castracane. 
,, acuminata, Grunow. 
,, dubia , W. Smith. 
,, socialis, Gregory, var. indica , Castracane 
„ sigma, W. Smith. 
longvsima , Ralfs, var. reversa, Grunow 
Thala-ssiothrix nitzsehioides, Grunow. 
„ longissima, Cleve and Grunow, 
„ frauenfeldii, Grunow, var. tenella, 
Grunow. 
Synedra pliilippinarum, Castracane. 
Sunrella fastuosa, Ehrenberg. 
Campylodisc us b iangulaius, G reville. 
Cyclotella striata, Grunow, var. baltica , Grunow. 
Paralia sulcata, Cleve. 
Slephanopyxis corona, Grunow. 
„ superba, Grunow. 
„ palmeriana, Grunow. 
„ hyalina, Grunow. 
(summary of results chall. exp. — 1893.) 
H yalodiscus stelliger, Bailey. 
Coscinodiscus excentricus, Ehrenberg. 
„ lineatus, Ehrenberg. 
„ curvatulus, Grunow. 
„ ,, var. recta, Battray. 
„ normanni, Gregory. 
„ subtilis, Ehrenberg. 
„ concinnus, W. Smith, var. arafurensis, 
Rattray ( = C. papuanus, Castracane). 
„ concinnus, var. j ones/’ ana, Rattray. 
„ radiaius, Ehrenberg. 
„ crassus, Bailey. 
,, nodulifer, Janisch. 
,, oculus-iridis, Ehrenberg. 
,, nobilis, Grunow. 
„ janischii, A. Schmidt, var. arafurensis, 
Grunow. 
,, gigas, Ehrenberg. 
„ gazelles, Janisch ( = Ethmodiscus sp., 
Castracane). 
Ethmodiscus tympanum, Castracane, 
Actinoptychus trilingidatus, Greville. 
„ areolatus, A. Schmidt. 
„ undulatus, Ehrenberg. 
Adinocyclus concentricus, Rattray. 
,, complanatus, Castracane. 
Palmeria hardmaniana, Greville. 
Hemiaulus chinensis, Greville, forma excentrica. 
Biddulpliia chinensis, Greville. 
„ indica , Roper. 
Triceratium distinctum, Janisch. 
,, scitidum , Brightweil, forma guadrata. 
„ muricatum, Brightweil. 
Belleroehia malleus, Yan Heurck ( = Triceratium, 
Brightweil). 
Eucampia zodiacus, Ehrenberg. 
„ „ var. nodosa, Grunow. 
93 
Arafura Sea. 
Organisms from 
Surface-Nets. 
