418 PROCEEDINGS OF THE ACADEMY OF [1888. 



Vol. VIII, 1886. Naticidte, Calyptrreidre, Onustida?, Turritel- 

 Hdre, Vermetidte, Ciiecidse, Eulimidre, Pyramidellidfe, TurbonillidDe.. 

 8vo, pp. 461 ; plates 79 ; figures 1582. 



Vol. IX, 1887. Solariidte, lanthinidie, Tricliotropidje, Scalariidfe, 

 Cerithiid?e, Rissoidre, Littorinidte. 8vo, pp. 488 ; plates 71 ; figures 

 1991. (The first series will be completed iu eleven or twelve 

 volumes). 



Second series Terrestrial Mollusca. 



Vol. I, 1885. Testacellidre, 01eacinid?e, Streptaxidre, Helicoidea, 

 Vitrinidje, Limacid?e, Arionidte, etc. 8vo, pp. 364 ; plates 60 ; fig- 

 ures 1698. 



Vol. II, 1886. Zonitidfe. 8vo, pp. 265 ; plates 64 ; figures 2072. 



Vol. Ill, 1887. Helicidse (begun ; to be completed in three or 

 four volumes). 8vo, pp. 313 ; plate 63 ; figures 2664. 



Third series — Marine Bivalves — 4 or 5 volumes. 



Fourth series — Fluviatile genera — 4 or 5 volumes. 



Note — The second, third and fourth series will be continued 

 and completed by H. A. Pilsbry, Conservator of the Conchological 

 Section of the Academy of Natural Sciences of Philadelphia. 



Church and Stage, Philadelphia, INIarch 15, 1880, (printed for 

 private use). 8vo, pp. 12. 



Structural and Systematic Conchology : An introduction to the 

 study of the Mollusca. By George W. Tryon Jr. Conservator of 

 the Conchological Section of the Academy of Natural Sciences of 

 Philadelphia. Published by the author, and issued from the 

 Academy. 



Vol. I, 1882. 8vo, pp. 312 ; plates 22 ; figures 256. 



Vol. II, 1883. 8vo, pp. 430 ; plates 69 ; figures 1339. 



Vol. Ill, 1884. 8vo, pp. 453 ; plates 49 ; figures 1492. 



