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Hurrox.—On the Structure of Struthiolaria papulosa. 117 
Arr. V.—Notes on the Structure of Struthiolaria papulosa. 
By Professor F. W. Hurron. 
[Read before the Philosophical Institute of Canterbury, Tth September, 1882.) 
Plate XII. 
Lasr year Mr. J. D. Enys kindly gave me two specimens, male and female, 
of Struthiolaria papulosa which he had collected at Nelson and preserved in 
spirit. All that is known at present of the structure of Struthiolaria is con- 
tained in the description of the animal of S. crenulata (= S. australis) in 
the Zoology of the Voyage of the Astrolabe (vol. ii., p. 480, pl. 31, fig. 7-9), 
in which a female is figured, and a description of the lingual dentition in 
the Trans. N.Z. Institute, vol. xiv., p. 163, pl. vi., fig. m. A few remarks 
-on the specimens collected by Mr. Enys will, therefore, be interesting. 
The csophagus is long, expanding gradually into the stomach (fig. 
8m.); the intestine turns abruptly forward to the heart, passes 
through a loop of the anterior aorta, and proceeds at once to the anus, 
which freely projects from the mantle. The odontophore is very small and 
easily overlooked. The liver is large and greenish or greenish-brown, it 
lies on the lower side of the spiral portion of the animal, the upper side 
being occupied by the reproductive organs; the hepatic duct opens at the 
pyloric end of the stomach, just where the intestine begins. The heart is 
large, and pale-yellow in colour. The gill is single attached to the mantle 
along the left side, the plates being very long, stiff, and free; they appear 
to me to be simple, and not ‘“ boutonnées” as stated by Quoy. The renal 
organ lies at the base of the gill, and a duct, formed by a fold of skin, 
leads from it over the anterior portion of the body inside the rectum 
(fig. 1-3 y); in the male it opens at the base of the penis; in the female, 
between the right tentacle and the anus. The male reproductive organs 
consist of a scarlet-lake testis and a long vas-deferens formed by a fold of 
skin running along the anterior part of the body, inside the renal duct, to 
the base of the right tentacle and ends in a long slender non-retractile 
eurved penis (fig. 1-2 d). In the female the ovary is of a cream 
colour; the oviduct is like the vas-deferens, but it ends behind the right 
tentacle in an expanded fold of skin. 
In my paper of last year I figured the different teeth isolated from each 
other, I therefore append to this paper a sketch of the teeth in their natural 
position (fig. 4.) I have also added a figure of the operculum (fig. 5), as 
it is incorrectly given by H. and A. Adams in their Genera of Recent 
Mollusca, and also an outline of the animal of S. australis from the Voyage 
of the Astrolabe. 
