194 EPIPHRAGMOPHORA. 



? -\-Ccelospira ANC., Conch. Exch., i, p. 20, type H.macneili (not 

 Ccelospira Hall, 1858, Brachiopoda)=J.i;ere/&a ANC., 1. c., p. 54, 

 Apr., 1887, same type. -(- Trichodiscus STREBEL, Beitr. Mex. Land- 

 und Siissw.-Couch., iv, p. 32, 1880 (not of Ehrenberg, Infusoria)= 

 Trichodiscina v. MARTENS, Biol. Centr. Amer. Moll., p. 133, March, 

 1892 ; type H. coactiliata. 



See for anatomy W. G. Binney, Terr. Moll., vol. v (figures not 

 always reliable !). Semper, Reisen, etc., p. 242. Doring, Bol. Acad. 

 Nac. Sci., Cordova, i, and Estudos Sist. y Anat. sobre los Mol. pulm. 

 de los poises del Plata, Periodico Zool.,i, 1875, p. 129-204. Strebel 

 & Pfeffer, Beitr. Mex. Moll., pt. iv. HEYNEMANN, Mai. Bl., xv, 

 pi. iv, fig. 4. 



Shell varying from globose to subdiscoidal, rarely keeled, umbili- 

 cate or imperforate, with 4 to 7 whorls. Surface generally decus- 

 sated, malleated or hirsute; the texture varying from corneous to 

 chalky; generally variegated, having a supraperipheral band, some- 

 times 3-banded. Aperture lunar, the lip expanded or reflexed, 

 dilated at columellar insertion, toothless ; but a few species have a 

 columellar nodule or internal plicse. Type E. hieronymi Doring, 

 pi. 59, fig. 77. (See also pi. 58, figs. 57 to 74). 



Animal granulated as usual, with a pair of dorsal grooves and 

 no distinct facial grooves, the tail rounded above, not keeled nor 

 grooved. Sole undivided (pi. 45, fig. 6, E. fidelis', pi. 59, fig. 76, 

 E. nickliniana, showing atrium extruded, and the characteristic 

 granulation of foot, not well shown in the fig. of E. fidelis). Right 

 eye retractor passes between branches of genitalia. 



Jaw arched, with 3 to 8 stout ribs denticulating the margins (pi. 

 59, fig. 78, E. semiclausa ; fig. 80, areolata ; fig. 83 nickliniana; 

 fig. 84,fidelis; fig. 85, arrosa; pi. 52, fig. 17, E. cordovana). 



Radula characterized by median and lateral teeth without side 

 cusps ; marginals with the entocone-f mesocone forming a long com- 

 pound cusp, ectocone simple, never bifid. (PI 60, fig. 10, E.fidelis. 

 Fig. 7, E. nickliniana. Fig. 4, E. areolata). 



Genitalia characterized by a slender penis continued in an epi- 

 phallus which bears the retractor ; flagellum present. Dart sack 

 short, its apex neither constricted nor attached, containing a two- 

 edged dart, pi. 59, fig. 82, E. mormomim. Mucus gland either (1) 

 single and club-shaped, seated on dart sack, pi. 59, fig. 81, or (2) 

 single but dividing above into two bulb-bearing branches, pi. 59, 



