MURDOCH : NEW ZEALAND MOLLUSCA. 



325 



"wide sacculated convolutions. The spermatheca {spr.) is an oval- 

 shaped sack attached to the oviduct by a strong membrane, it branches 

 from the free portion as a narrow tube. 



Aliynentary system. — The buccal mass is large and muscular, a large 

 salivary gland envelops the oesophagus, with two salivary ducts emptying 

 into the buccal cavity. The jaw and dentition have been described 

 and figured by Capt. Hutton.^ The stomach passes gradually into the 

 intestine, the latter makes a left-hand spiral turn, passes forward to 

 the pulmonary chamber, thence back for nearly the full length of the 

 stomach, turns abruptly to the right, and proceeds as a straight narrow 

 tube. Part of the stomach and intestine were in a bad state of 

 preservation, but, so far as I could unravel them, seemed to be as 

 described. 



The muscular system is divided into right, left, and median bands, 

 the latter forming the powerful retractor of the buccal mass ; all three 

 bands arise from the same point on the columella, the right and left 

 in passing forward break up into numerous strands, which are attached 

 to the foot, and also supply the ommatophore retractors, the right 

 passing through the genital branch. 



The principal ganglia of the nervous system form two groups, the 

 larger lying beneath the posterior end of the buccal mass, the smaller 

 on its dorsal surface, a band on each side uniting the two. The 

 course of the nerves I have been unable to trace out. 



Pedal gland. — This opens below the mouth, it forms a small 

 undulating tube passing along the body-cavity, partially enveloped 

 in a delicate tissue, which is attached to the body and termiaates in 

 the solid substance of the tail. 



EXPLANATION OF PLATE XVI. 



al.g. 

 h.d. 

 h.g. 

 p. 

 p.s. 



Fig. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 



Sic/areiiis ? Brewi. (Nat. size.) 

 Cirsottella? JSfeozelanica. x 10. 



Flacostylus hovinus. 

 Flammulina pilula. 



Flammulina lucetta. 



Albumen gland. 



Hermaphrodite duct. 



Hermaphrodite gland. 



Penis. 



Penis cross section. 



Prostate. 



Eetractor muscle. 



spr. 

 v.d. 



Operculum. 



Animal. 



Jaws. 



Dentition. 



(Juv., X f.) 



Genitalia. 



Jaw. 



Dentition. 



Genitalia. 



Jaw. 



Dentition. 



Genitalia. 



Sheath of penis. 

 Spermatheca. 

 Vas- deferens. 

 Uterus. 



Enveloping sack : 

 unknown. 



function 



1 Trans. New Zealand Inst., vol. xiv, p. 152, pi. iii, figs. D, 0. 



