of Nautilus Pompilius. 69 



the testis opens. By this furrow the said conical extremity is 

 received in the natural position of the parts, and at its bottom is 

 a fissure which leads to a small cavity of the gland, which is 

 covered by a membrane with slight longitudinal folds, but in 

 other respects smooth. At the upper part in this space the fine 

 extremity of the convoluted canal opens. This canal is thus the 

 deferent vessel [vas deferens), and the second gland is therefore 

 to be regarded in part as an investiture of this deferent vessel. 

 But this vessel is also the efferent duct of the secretion effected 

 by the glandular tissue through which it runs, and is doubtless 

 also itself moreover the seat of a secretion, since its walls present 

 the same cylinder-epithelium as the acini of the surrounding 

 gland. These walls are very thick, especially in the upper part, 

 so that the inner space bears no proportion to the external cir- 

 cumference. This, on an average, has a diameter of two milli- 

 meters : anteriorly the tube becomes wider, but not uniformly ; 

 the two principal dilatations which it presents are fully three 

 millimeters in diameter. 



The saccule, of which we spoke above, forms a diverticulum 

 terminating csecally on the left side. Its inner surface has on 

 the right side many projecting transverse folds, and presents 

 here a second small aperture, situated immediately above the 

 termination of the vas deferens ; around this aperture the said 

 folds form some circles. It is the inferior extremity of a tube 

 4 or 5 millimeters in length, with a circumference of about 3 

 millimeters. This tube has very thick walls, and presents longi- 

 tudinal folds on its inner surface. It leads to the spermophore- 

 sac*, a cylindrical bladder with veiy firm walls, so that when 

 quite empty it does not collapse. The internal cavity of the 

 bladder has numerous projecting folds that run longitudinally, 

 and is divided by a partition running obliquely and having a 

 free anterior margin into two cavities which communicate at the 

 upper part. This bladder passes immediately into the canal of 

 the penis (the urethra seminalis), which also presents strongly 

 projecting longitudinal folds. The thick walls of this canal, 

 which form the penis, consist of a very firm tissue; on the cut 

 surface some round apertures are visible, which appear to be the 

 sections of blood-vessels. At the extremity of the penis the 

 termination of the urethra seminalis is seen as a transverse aper- 

 ture surrounded by a thick margin, which is divided by incisures 

 into some tubercles; on the surface that faces downwards, in 

 particular, two such tubercles may be obviously distinguished. 



In a specimen investigated by me, which had died during the 



* The French writers on the anatomy of the Cephalopods name this 

 part poche Needhamienne, after Needham, who is usually regarded as the 

 discoverer of the spermophores. 



