176 



SCIENCE-GOSSIP. 



V. Section Sinicola. 



A. Armature unknown. . 



.. jiigatoriat 

 alphtyn^i. 

 vallata, 



B. Two transverse parietal plates. 



a. Shell 6 m.m. . . ... . . . . . . diptychia, 



b. Shell 16 m.m. . . . . . . . . hiforis. 



C. One transverse parietal plate. 



a. Parietal denticles or folds none. 



(X. Palatal folds in one series, parietal 

 horizontal fold at aperture. 



* Shell 6.5 m.m. . . . . . - . . invia. 



** Shell 9 m.m. .. .. .. .. secura. 



fj. Palatal folds in two series . . . . schistoptychia. 



No horizontal fold at aperture. 



b. Two parietal denticles anterior to 

 transverse plate. 



a. Whorls ang-ular or keeled, palatal 

 folds six. 



' Whorls 4^, shell not exceeding- 7 mm. cmoriois. 

 ** Whorls 6. 

 t Shell 15 m.m. .. .. .. .. Jiinbriosa. 



"t"t Shell 12 m.m. .. .. .. azona. 



kJ. Whorls rounded, palatal folds 7 . . pulvhiaris. 



c. Two parietal denticles posterior to 

 transverse plate . . . . . . . . cutisculpta. 



d. One or two horizontal folds in front of 

 parietal plate. 



a. Shell acutely keeled, umbilicus 



moderately desp ; two vertical denticles 



between folds .. .. .. .. reseraia. 



jo. Shellang:ulated, umbilicus very deep; 



one horizontal denticle between folds . . lajnini/era. 

 €. Two short horizontal folds in front of 

 parietal plate, with one to four denticles 

 between. 



a. Shell conical above, 6^ — 7 whorls. 



* Whorls rounded . . . . . . stcnochila. 



** \Yhorls keeled .. ..v. basilia. 



fj. Shell depressed, 5^—6 whorls . . jnurata. 



f. One short horizontal fold above, with 

 four or five denticles below, in front of 

 parietal plate ; shell shining:, pellucid . . 7nultispira, 

 VI. Section Enteroplax. 



A. Palatal folds : four. 



a. Horizontal parietal folds united by a 



vertical ridge posteriorly . . . . guadrasL 



b. Parietal folds not united . . 



a. Umbilicus moderate trochospira. 



p. Umbilicus narrower . . . . . . v. boholciisis. 



B. Palatal folds : ten . . .. .. .. polyptychia. 



VII. Section Sykesia. 



A. C?«c transverse parietal fold. 



a. Notched about the middle, a short sup- 

 ■ " port posteriorly above. Ceylon. 



a. Umbilicus wide ribs and lyrae 



prominent . . . . . . clathrahda. 



p. Umbilicus narrower ribs and lyrae 



obsolete v. comprcssa. 



b. Not notched. 



a. Straight, without support, umbilicus 

 slUl narrov/er. Habitat, India .. .. clathratuloidcs. 



fj. Sinuous, with a short support an- 

 teriorly above ; umbilicus still narrower, 

 Habitat, India .. ., .. .. retifcra. 



B. Tzvo transverse parietal plates. 



a. Shell flattened, no fold below umbilical 

 angulation, umbilicus still narrower. 



Habitat, Ceylon caligijiosa. 



b. Shell conoid, with a double fringe of 

 curved hairs; a horizontal fold below 

 umbilical angulation ; umbilicus still 

 narrower. Narrowest of all. Hab., Ceylon hiciliaia. 



Index to Plectopylis. 



' The roman figures after the names indicate the volume 

 of SciEN'CE-GossiP New Series, page is in ordinary tj-ps, and 

 number of figure is in italic type. 



achatina, v., 114. 80^ 81, 83, 

 V. breviplica, v., 134, 8y, 

 V. castanea, v., 134, 86. 

 V. infrafasciata, v., 133, 84. 

 V. obesa, v., 115, Sj^ 

 V. repercussoides, v., 333. 

 V. venusta, v., 134, 8s • 



affinis, iii., 276, 41. 



alphonsi, v., 239, 9./. 



andersoni, iii., 154, //. 



anguina, v., 76, jg. 



austeni, vi., 15, 97. 

 AUSTENIA, III., 300, 332, r/., 149. 



azona, iii., 180, 204. 



biciliata, vi., 16, gg. 



biforis, iv., 103, 57, 



blanda, iv. , 264, yo. 



brachydiscus, iii., 154, 18. 



brachyplecta, iii., 246,^7. 



brahma, iv., 170, 6j. 



burmanica^ iii, 24.5. 



cairnsi, v., 171, go. 



caliginosa, vi., 75, 100. 



catinus^ iii., 244. 

 Chersaecia, VI., 148. 



clathratula, iii., 300, 42. 

 V. compressa, vi., 75, lor. 



clathratuloides, iii. 332, 44. 



congesta, v., 332, gb. 



cutisculpta, iii., 180, 2b, 



cyclaspis, iii. , 244, J4. 



dextrorsa, iii., 156, 21. 



diplychia, iv., 2S4, 77. 



emoriens, iv., 36, jO. 

 Endoplon, VI., 148. 

 Endothyra, VI., 148. 

 Enteroplax, vi., 149. 



eugeni, v., 172, g2. 



fimbrinsa, iii., 179, 24. 



V. nana, iv. , I So. 

 francoisi, vi., 75, 102. 

 fultoni, iii., 178, 2^. 



hanleyi, v., 240. 



I 181, 2S. 



mvia. 111. I 204. 



jovia, iv., 138,59. 

 jugatoria, v., 240. 

 karenorum, iii., 244, y. 

 lacy this ( Nanina), v., 115. 

 laracabensis, v., 171, 9/. 

 laminifera, iii., 204, jo. 

 laomontana, iii., 245,^6. 

 leiophis, v., 16, 76. 

 leucochila, iv., 231, 6b. 



