240 NILS HJ. ODHNER 



No jaw is, however, present, and the genital organs (fig. 15) are different, thus 

 justifying a reference to distinct genera. They are situated Hkewise totally above 

 the retractor of the right tentacle, but the penis is reduced to a small papilla 

 close within the genital opening; at this papilla is inserted a fine retractor muscle, 

 and here the vas deferens debouches. The function of a penis has been over- 

 taken by a very long appendix extending from the genital orifice about one 

 whorl backwards. The appendix is equally cylindric throughout; its walls are 

 muscular, and it includes a muscular cord acting as an evertible penis. At the 

 hind fourth of the appendix a thin retractor is attached which further back joins 

 that from the penial papilla; at its hindmost end this retractor inserts the 

 diaphragma. The vas deferens runs backwards at the inside of the oviduct. 



In the female part we find a very short vagina. At the point where it 

 passes into the oviduct a very long duct leads upwards to the spermatheca. 

 The oviduct is very wide; in one individual it contained 6 eggs, in another 6 

 embryoes, the most advanced ones with a shell containing 2 V2 whorls. 



Where male and female canals join backwards, an irregular ampulla-shaped 

 sac is formed which carries on each side a short prostata gland, and on its 

 hindmost side a well-developed albuminiparous gland. Further, from this sac 

 issues backwards the hermaphrodite duct, and forwards a peculiar lengthened 

 vesicula seminalis, which descends close to the columellar muscle, and has a 

 structure like that of the penial appendix, thus having muscular walls. The distal 

 end of this vesicula seminalis is peculiarly fixed to the muscle: at the inner 

 (axial) side of the muscle this attachment causes a small pit, and an invagina- 

 tion in the shape of a solid stopper enters, to a short extent, into the interior 

 of the vesicula end. This stopper has, however, no opening leading to the 

 exterior, and thus the vesicula is entirely closed. That it represents a vesicula 

 seminalis is likely from facts mentioned by treatening Fernandezia bulimoides. 



The hermaphrodite duct is of a general winding shape with a median 

 dilatation, and the gonad consists of a small number of separate lobes. 



T. plicosa shares the organization of T. bilamellata, but the vesicula semi- 

 nalis is longer, so that its upper portion is bent into a coil. 



Nervous system and bulbus pharyngeus have the same shape as in Fer- 

 nandezia. 



Fernandezia. Pilsbry 191 1. 



This genus, established by Pilsbry exclusively on the shell characters, 

 and with respect to its remote geographical occurrence, was included by its 

 author provisionally in the fam. Amastridae, characterized by its achatinoid, 

 not achatinelloid, radula. The soft anatomy and the radula were unknown to 

 Pilsbry, but the material collected by the Swedish expedition contained spe- 

 cimens adapted to examination, and this gives the result that the radula, as 

 well as the soft anatomy, very closely resembles that of Tornatellina, and that 

 the genus is to be included in the fam. Tornatellinidae. The generic distinc- 

 tion seems well motived, since in Fernandezia the penial appendix bears an 

 accessory sac and the shell lacks all lamellae, even in the nepionic stage, which 

 was examined in F, btdimoides (fig. 18, /) and cylindrella (fig. 18, h). Thus 



