Hutton. — On the Structure of Strathiolaria papulosa. 117 



Art. V. — Notes on the Structure of Struthiolaria papulosa. 



By Professor F. W. Hutton. 



[Read before the Philosophical Institute of Canterbury, 1th September, 1882.] 



Plate XII. 

 Last 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. 430, pi. 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, pi. vi., fig. h. A few remarks 

 on the specimens collected by Mr. Enys will, therefore, be interesting. 



The oesophagus is long, expanding gradually into the stomach (fig. 

 3 m.) ; 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 attacked to the mantle 

 along the left side, the plates being very long, stiff, and free ; they appear 

 to me to be simple, and not " boutonnees'' 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 g) ; 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 

 curved 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 Eecent 

 Mollusca, and also an outline of the animal of S. australis from the Voyage 

 of the Astrolabe. 



