CONTENTS. ARTHROPOD A, p. 303. Pe r ipa t iodea , with Segmental Coelomoducts mostly excretory, p. 305. Crustacea, possibly with remnants of Nephridia, p. 308. Summary, p. 317. Arachnida , p. 318. Chilopoda, Chi lognatha , Symphyla , Insec ta Hexapoda, p. 320. General summary for Arthropoda, p. 322. MOLLUSCA, p. 324. Larval Protonephridia and Adult Coelomic Kidneys and Genital Ducts, p. 325. Re...

Strophomenid brachiopods have long been interpreted as ‘‘snowshoe’’ strategists, with their flattened concavoconvex valves providing resistance to foundering in very soft sediments. There has been a sharp difference of opinion in whether the shells were oriented with their convex or their concave surface in contact with the sediment. This study, along with independent evidence from sedimentolog...