Vol X No. 4.] The Reproductive System of Atopos, Simroth. 113 



[N.S.] 

 wards over the hermaphrodite gland to be attached to the 



body- wall behind the latter. 



8. The Simrothian glands, one on each side, are two 

 tubular glands opening into the exterior at the base of the 

 lower tentacles, the right one being united with the penial 

 sheath just behind the external opening. 



Each Simrothian gland is divisible into three portions in 

 all the species. They are as follows, starting from the free 



proximal end : — , 



(a) The free portion of the tube, which is much coiled 

 in some species but loosely so in others. It generally lies 

 beneath the buccal mass and salivary glands. 



(b) A very narrow portion forming a fractional part of the 

 whole length. It is loosely coiled in all the species described. 



(c) The stoutest portion forming the base which opens to 

 the exterior. This part of the tube invariably presents a small 

 process at its proximal end, and gives attachment to a muscu ar 

 strand which is inserted to the body- wall close to it. In A. {I ) 

 sangutnolenta , this portion is not well developed, although the 

 process is present; the muscular strand, however, has dis- 

 appeared. Moreover, there is an additional stouter portion 

 intervening between the second and the third (last) portion of 



the gland. , 



The arrangement of the generative organs and the ducts 

 in the present genus is closely similar to those in the Cephal- 

 aspida? (Opisthobranchia Tectibranchia) and corresponds to the 

 first tvpe of duct described by Lang. 



It is an important point to note that, considering the 

 structure of the reproductive system, the present genus seems 

 to be far removed from the genus Vaginula, with which it was 

 formerly associated in the family Vaginulidae. It has rightly 

 been removed from that family and placed in a separate 



one. 



Literature. 



1. Collinge, W. E. " Report on the Non-operculate Land 

 Mollusca," Fasciculi Malayensis, Zool. part II. 



2. Collinge. W. E. "On the Non-operculate Land and 

 Freshwater Molluscs," Journal of Malacology 1902, Vol. 1A, 

 pt. 3. 



3. Ghosh, E. "The Anatomy of Atopos (Podangia) 

 sanguinolenta, Stol., MS.," Records of the Indian Museum, 



Vol. II, part II, No. 17. ,, n a t 



4. Ghosh, E. "Mollusca, I; Rathouisiidae, Records or 



the Indian Museum, Vol. III. Zoological Results of the Aoor 



Expedition, 1911 12, Part III. fcA 



5. Simroth, H. " Uber das Vaginuliden genus Atopos, 

 n-g." Zeit. f. Wiss Zool. 1891, Bd. Ill, pp. 593-616 T. XXVII. 

 C P. R. 



