118 Transactions. — Zoology. 



EXPLANATION OF PLATE XII. 

 Fig. 1. Struthiolaria papulosa. Male. 



Fig. 2. ,, ,, „ Branchial cavity laid open. 



Fig. 3. „ ,, Female. Branchial and abdominal cavities laid open. 



All three dra wings are taken from spirit specimens. 



a, foot ; b, operculum ; c, rostrum ; d, penis ; e, vas-deferens ; /, oviduct ; 



g, renal duct ; h, mantle-; i, branchia ; k, columellar muscle ; I, siphon ; 



in, stomach ; n, anus ; o, heart. 

 Fig. 4. Struthiolaria papulosa. Dentition magnified 160 times. 

 Fig. 5. . „ „ Operculum magnified two diameters. 



Fig. 6. „ australis. Living animal, after Quoy. (Female.) 



Art. VI. — Notes on some Branchiate Gastropoda. 



By Professor F. W. Hutton. 



[Read before the Philosophical Institute of Canterbury, 3rd August, 1882.] 



Plates XIII.-XVL 



Aplysia tryoni, Meinertzhagen. PL XIII., fig. a. 

 Dentition, 13-1-18. Teeth quadrate, with basal and reflected portions. 

 Beflexed portion of central tooth trilobed, with a single cutting-point on 

 the median and two small ones on each of the lateral lobes. Interior 

 laterals three-lobed, the interior one the largest, each with a smooth 

 cutting-point. Outer laterals one-lobed, with a toothed cutting-point. 

 The three outer marginals reduced to plates. 



The teeth figured are from a dried specimen collected at Napier, and 

 given me by Mr. Tryon. 



Calliop^ea felina, Hutton. PL XIII. , fig. b. 



Eadula consists of about eleven blunt oval teeth placed in a single 

 series, and getting gradually smaller. 



The specimen figured came from Lyttelton. 



Murex octogonus, Quoy and G-aimard. PL XIII., fig. c. 



Dentition. — Central tooth with five nearly equal and equidistant cusps, 

 the anterior surface concave, and the sides rounded. Operculum ovate, the 

 nucleus subapical. 



I am indebted to Mr. T. F. Cheeseman for specimens from Auckland. 



Trophon paiv^e, Crosse. PL XIII., fig. d. 



Animal white, speckled with dead white. Foot slightly expanded and 

 rounded in front, obtusely pointed behind. Tentacles approximated, the 

 eyes on their external sides about two-thirds up from the base ; siphon 

 short, barely protruding from the canal. Dentition. — Central tooth with 

 five pointed cusps, the middle one the largest, and those on each side of it 



