182 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Plate 35 



Fig. 1. Surirella macraeana Greville. X 400 156 



(See also pi. 34, figs. 5, 6, 7.) 



2. Surirella facilis, new species. X470 154 



3. Surirella fausta A. Schmidt. X620-_. 155 



4. Surirella studeri Janisch. X400 158 



Plate 36 



Page 



Fig. 1. Surirella orientalis, new species. X660 156 



2. Surirella significans, new species. X810 158 



3. Surirella suluensis, new species. X470 158 



Plate 37 



Page 



Fig. 1. Synedra pulcherrima Hantzsch. X570 159 



2. Tribrachia pellucida, new species. X410 161 



3. Trigonium diaphanum, new species. X410 163 



4. Trigonium bicoronatum (Castracane) Mann, X430 161 



(See also pi. 38, figs. 1, 2, 3.) 



Plate 38 



Page 



Fig. 1. Trigonium bicoronatum (Castracane) Mann. X820 161 



2. Trigonium bicoronatum (Castracane) Mann. X630 161 



3. Trigonium bicoronatum (Castracane) Mann. X800 161 



Plate 39 



Page 



Fig. 1. Trinacria limpida, new species. X460 172 



2. Trinacria tripedalis, new species. X900 173 



3. Trinacria tripedalis, new species. X900 173 



4. Tropidoneis phantasma, new species. X450 174 



5. Tropidoneis vaga, new species. X530 174 



6. Trigonium contumax, new species. X780 162 



o 



