Index to Volume l. 315 



PAGE 



Sertularia abietina 68 



in guina 54, 68 



argeutea, figs. 76-79 4, 67 



eampyloearpum 



desmoidis, figs. 70-72 65 



dichotoma 57 



ilumosa 59 



filicula, fig. 80 68 



fureata, figs. 7:'.-7o 4, 60 



fusiformis 61 



geniculata 58 



greenei 69 



incongrua, figs. 81, 82 69, 70 



inconstans 68 



pluma 73 



setacea 70 



1 1 :.ski, fig. 83 69 



trieuspidata 69 



turgida 64 



volubilis 54 



Sertulariidae 60 



Sexual elements, origin of 117, 123, 125 



Size of Tomaria ritteri 174, 181, 182, 192 



Skeleton, axial in Balanoglossus 185 



Some New Tintinnidae in the Plankton of San Diego Region 287 



Specific Gravity of Tornaria 181, 187-103, 197, 202 



Spermatogenesis 117, 123 



Spermatozoa, scarcity of in Crisia 119, 121 



in Enteropneusta 2nd 



Spiral movements of Tornaria 101 



Spiral structure of lorica of Tintinnidae 297-298 



Staining in Microscolex elegans 271 



in Plethodou 161, 27,1 



Stereobalanus willeyi 173 



Stimulants for time reactions 281) 



Stimulation, electrical 16? 



Stomach of Tornaria 176. 177. isl 



Studies on the Ecology, Morphology and Speeiology of the Young of 



some Enteropneusta of Western North America 171 



Structure and regeneration of the poison glands of Plethodou 211 



of sense organs in .Microscolex elegans 272 



Summary of distribution of sense organs in Microscolex elegans. . 280, 28] 



of embryology and embryonic fission in tin' genus Crisia 145, 146 



of Studies in Ecology, etc., of young Enteropneusta 171 



Swimming in Tornaria ' s! '- 191, 197 



significance of I s i 



Stylactis fusieola 35 



