400 PROCEEDINGS OF THE ACADEMY OF [1881 



A nodulosus Goldf. Detached columns. 



A. nubilii Angelin, Periechocr. nubilis. 



A. nyssa Hall, see Gennxocr. nyssa. 



A. oblalus Hall, syn. of Batocr. rolundus, 



A. ohpyramidalis Winchell and Marcy. Internal cast. 



A. oUiculus Hall, syn. of Periechocr. Whitei. 



A. ornatus Hall, see Physetocr. ornatus. 



A. papillatus Hall, syn. of Batocr. clypeatus. 



A. Parkinsojii de Koninck (?). Not seen the description. 



A. parvus Shumard, see Dorycr. parvus. 



A. pendens Hall, syn. of Dorycr. unicornis. 



A. pentagomis Hall, see Steganocr. pentagonus. 



A. pentaspinus Lyon, see Centrocr. pentaspinus. 



A. perumbrosus Hall, syn. of Strotocr. regalis. 



A. pistilliformis Meek and Worth., see Batocr. pistilliformis. 



A. pistillus Meek and Worth., see Batocr. pistillus. 



A. planobasilis Hall, syn. of Amphoracr. divergent. 



A. planodiscus Hall, see Balocr. planodiscus. 



A. plumosus Hall. Detached arms. 



A. pocillum Hall, see Gennmocr. pocillum. 



A. polydactylus Bonny (not Miller), Melocr. pachydactylus. 



A. precursor Hall, see Dorycr. {?) precursor. 



A. prumiensis Wirtgen and Zeiler, see Dorycr. prumiensis. 



A. pulcher (Salter MS.) McCoy, see under Periechocrinus. 



A. pyramidatus Hall, see Agaricocr. pyramidatus. 



A. pyriformis Ad. Roemer. Not seen de<(cription. 



A. pyriformis Shumard, see Batocr. pyriformis. 



A. pyriformis var. rudis M. and W., syn. of Batocr. pistilliformis. 



A. quadrispinus White, syn. of Amphoracr. divergens. 



A. quaternarius Hall, syn. of Actinocr. jiroboscidialit. 



A. spiniferus Hall, syn. of Actinocr. proboscidialis. 



A. quinquangularis Angelin, see Periechocr. quinquangularis. 



A. qumquelobus Hall, syn. of Dorycr. cornigerus. 



A. radiatus Angelin, see Periechocr. radiatua. 



A. ramulosus Hall, see Eretmocr. ramulosus. 



A. regalis Hall, see Strotocr. regalis. , 



A. regularis Hisinger = TJypanthocr. regularis. 



A. remibrachiatus Hall, see Eretmocr. remibrachiatus. 



A. retiarius Phillips. Detached columns. 



A. rotundas Yandell and Shum., see Batocr. rotundus. 



A. rudis Hall, see Teleiocr. rudis. 



A. rusticus Hall, syn. of Actinocr. scitulus. 



A. Schultzianus Angelin, see Periechocr. Schultzianus. 



A. sculptus Miller. Detached columns. 



A. sculptus Hall, see Steganocr. sculptus. 



A. semiradialus Hall, see Periechocr. semiradiatus. 



A. senarius Hall, syn. of Physetocr. ornatus. 



