110 PLANISPIRA. 



Genus PLANISPIRA Beck, 1837. 



= Planispira-\- Cristigibba -\- A ngasella -j- Trachia -f- Eurystoma. 



Planispira BECK, Index Moll., subg. 25, p. 29. MARTENS in 

 Albers' Die Heliceen, p. 160, type H. zonaria L. SEMPER, Reisen, 

 im Arch. Phil., Landmoll., p. 120. TAPPARONE-CANEFRI, Ann. 

 Mus. Civ. Genov. xix, p. 162, 181, 1883. PILSBRY, Manual, vi, p. 

 274. Pusiodon (in part) SWAINS., Malacol., p. 330 (for H. zonaria 

 and auriculata). Philina (in part) ALBERS, Die Hel., p. 119. 



Shell depressed, generally umbilicated, having four to five rapidly 

 widening whorls, the first not granulated nor marked by hair points, 

 the last deeply deflexed in front. Aperture very oblique or subhori- 

 zontal; outer and upper lips expanded, basal lip reflexed, often 

 toothed. Type P. zonaria L., pi. 12, figs. 4, 5, 6. 



Animal having the sole undivided (pi. 12, fig. 2, P. zonarw). 



Genital system lacking all accessory organs on the female side, 

 the large spermatheca situated on a very long duct. Penis thick 

 and long, the retractor muscle apparently inserted at its apex ; 

 epiphallus ending in a short flagellum (pi. 12, fig. 1, P. zonaria). 



Jaw smooth, arcuate (pi. 12, fig. 7 P. zonaria.) 



Middle tooth and inner laterals with a single obtuse cusp ; outer 

 laterals and marginal teeth with the ectodont developed (pi. 12, fig. 

 3, P. zonaria). 



Distribution, southern Celebes, Moluccas, New Guinea ; aberrant 

 groups extending over the Indo-Malayan and part of the Australian 

 regions. 



This genus differs from Chloritis in the white or pale colored, 

 banded shell, very oblique aperture, and lack of quincuncial sculpt- 

 ure on the apex, and in the smooth jaw. It differs from Pupuinn in 

 the depressed earlier whorls of the shell and the ribless jaw. It 

 agrees with Obbain the jaw, but differs in lacking an appendix upon 

 the penis, and in the typically thinner, smoother shell, depressed at 

 the apex. 



The anatomy is imperfectly known from the work of Semper and 

 Tapparone-Canefri. Investigation should be directed to the penis 

 in order to ascertain whether a papilla is present (denied by Semper), 

 the true limits of penis proper and epiphallus, and the point of inser- 

 tion of the penis retractor, v. Martens describes the jaw of P. loxo- 

 tropis as weakly ribbed. It is probable that the complete absence 



