8o COLLINGE : ANATOMY OF SLUGS. 



this muscular ring forms the boundary of the opening of the vas 

 deferens into the lumen of the penis. There were no calcareous spi- 

 cules. The vas deferens is a long, densely coiled tube and at the 

 point where it opens into the common duct it is thrown into a series 

 of convolutions, similar to those which have been described in Pary- 

 phanfa hushyi, Gray, by Godwin-Austen (lo) and in Tesfacella tnaugei, 

 Fer., by myself (6). The receptaculum seminis is a wide sac-like 

 body, the whole of its internal wall being more or less folded. Just 

 before the opening into the vagina the folds have a dense arborescent 

 form, becoming less and less marked distally (PI. v, fig. ii). There 

 is no receptacular duct. The free oviduct is fairly long and shows a 

 slight constriction just in front of the point where the oviduct ceases. 

 The common duct is thrown into three well defined loops. The 

 albumen gland is small. There is a long hermaphrodite duct and a 

 very large hermaphrodite gland, measuring 23.5 mm. in length. 



Affinities. 



A. sechuenensis differs from A. altivagus, Theob. in the general 

 form of the generative organs, particularly in the smaller size of the 

 penis and receptaculum seminis and the larger hermaphrodite gland; 

 other differences are seen in the points of insertion of the retractor 

 muscle of the penis, the convolutions of the common duct, the shape 

 of the crop, and in the larger size and shape of the kidney. 



Anatomical details of most of the described species of this genus 

 are still wanting. 



TEBENNOPHORUS, Binn. 



Tebennophorus bilineatus, Bens., 1842. 



From Chekiang, China, Messrs. J. J. Walker and Basset Smith 

 have collected three specimens of Tebe7i7iu])ho)-us. Both externally 

 and internally these are identical with some I examined from Oahu 

 and Honolulu, Hawaiian Isles, in 1895 (?) ^"^ 1896 (8) and which 

 were referred to T. australiti, Bergh.* The original description of 

 this latter species (2) is not a good one, and unfortunately no figures 

 were given of the external appearance or anatomy, the lingual ribbon 

 only being figured. In 1871 (16) this was supplemented by a figure 

 of the jaw. 



Through the kindness of Dr. Ad. S. Jenson I have been allowed 

 to examine the type and dissected specimens of T. australis, Bergh, 

 from the Zoological Museum of the University of Copenhagen, also 



* The specimens recorded on p. 295, Proc. Malac. Soc. Lond., 1896, vol. ii, as T. striatus, 

 Hasselt, should be T. australis, Bergh. 



