MANUAL OF CONCHOLOGY 



Family STROBILOPSIDJE. 



Helicidcc and Pupidce of various authors. 



StrohilidcB Jooss, Jahrb. Nassauisclien Vereins f, Natur- 

 kunde, LXIV, 1911, p. 61. 



StroMlopsincB Pilsbry, Man. Concli. XXIV, 1918, p. x. — 

 Wenz, Fossilium Catalogus, Gastropoda Extramarina Ter- 

 tiaria, pars 20, 1923, p. 1041. 



Strobilopsidce Hanna, Nautilus XXV, 1922, p. 91. — Steen- 

 BEBG, fitudes sur I'Anat. et la Syst. des Maillots, 1925, p. 202. 



Shell trochiform, dome-shaped or discoidal, umbilicate, of 

 4l^ to 6 slowly-enlarging whorls. The aperture is small, ob- 

 lique, with armature of 2 or 3 parietal lamellae and several 

 deeply-placed basal folds, all growing continuously from an 

 early neanic stage. Peristome more or less thickened and 

 expanded, the ends of the lip remote, joined by a parietal 

 callus. 



Urethra lies very near the last part of the intestine. Ovo- 

 testis forms two groups of follicles. Penis is continued in a 

 long epiphallus and bears a long appendix, with swollen basal 

 and distal divisions, the penial retractor bifurcate, one branch 

 inserted on the epiphallus, the other on the base of the ap- 

 pendix (distally it attaches to the right ocular retractor, 

 according to Hanna). The jaw has numerous ribs. Radula 

 "v^dth tricuspid central tooth with square basal plate, as large 

 as the bicuspid laterals, the marginals multicuspid (PL 4, 

 fig. 10). 



By the structure of the male organs Strohilops resembles 

 Vallonia; Papilla, Lauria, the Achatinellida3, and some other 

 groups are similar in having a bifurcate penial retractor and 

 a long, tripartite appendix. If Hanna is right in stating that 

 the penial retractor is a branch of the right ocular band, this 

 is an important difference from any known orthurethroua 



