OP MOLLUSCA. 35 



**** Mantle lobes produced and partly covering the shell ; inner 

 lip produced over body whorl. 



8. VoLUTELLA. 



Shell fusiform ; spire acute, covered with a glassy deposit (often 

 artificially removed in cabinet specimens) ; nucleus small ; mouth 

 ovate, elongate ; inner lip expanded, reflexed ; mantle produced on 

 left side. Teeth ? Operculum none. 



§ Mantle lobes largely expanded, entirely covering the spire, which 

 is often covered with a callous deposit. 



1. V. angulata, t.27*. f. 1. Zidona a., Adams, Gen. Moll. t. 17. f. 5. 



§§ Mantle lobes moderately expanded, covering the lower side of 

 the spire and leaving a callous band on the suture of the upper 

 side ; spire often crowned. 



2. V. Scapha, t. 81 a. f. 5. 



3. V. imperialis. 



4. V. Cymbiola = Ausoba, Adams. 



5. V. Sophia. 



6. V. volvacea. 



7. V. tuberculata. 



§§§ Mantle lobes moderately expanded, not covering the spire; 

 suture simple ; spire not crowned. 



8. V. papillosa. 



9. V. fusiformis. 



10. "V. fulgetrum. 



1 1 . V. ancilla. 



•ff Amoriana. Teeth linear, base angularly diverging, with a 

 single conical apex ; mantle enclosed; nucleus of shell small, 

 regular, spiral. Animal oviparous 1 Operculum none (see p. 32). 



9. Amoria. 



Shell fusiform, polished ; spire conical ; suture with a callous 

 edge ; nucleus small, regular ; mouth elongate ; pillar with five 

 oblique plaits. 



1. A. Turneri. Kg. 19. 



2. A. undulata, t. 27. f. 1. Amoria Turneri. 



Mantle lobes of Amoria Turneri not ex- 

 panded ; veil very large, with the elongated 

 tentacle at its hinder margin ; the eyes sunk 

 at the base of their hinder edge ; siphon 

 with distinct ear-like lobes. Teeth in a single 

 series, with two angularly diverging bases, 

 and a central conical apex ; the apices form- 

 ing a continued vertical keel on the tongue- 

 membrane (fig. 19). 



d 2 



