Messrs. Hancock and Embleton on the Anatomy of Eolis. 93 



fore mentioned, the oviduct, the duct from the spermatheca, and 

 the posterior termination of the testis. The whole surface of the 

 gland presents to a certain extent the appearance of the cerebral 

 convolutions of the higher animals ; there is however a rounded 

 portion g^, seen next the fissure on the upper aspect of the lobes 

 when they are held asunder, that differs from the rest in being 

 opake, granular-looking and of a flesh colour, but more mi- 

 nutely convoluted than the semipellucid portion, yet forming 

 an integral part of it. The semipellucid part of the gland 

 can easily be seen to be disposed in the form of hollow laminae 

 folded upon each other, and these on the upper surface have a 

 zigzag arrangement. The cavities of the laminse communicate 

 freely with a wide channel in the interior of each lobe, and these 

 channels unite to form a common tiibe 6, which ends externally 

 at the female orifice, fig. 2 b', after having received the termina- 

 tion of the oviduct n. This gland we believe not to be the testis, 

 as Cuvier and his followers supposed it — for it has no direct con- 

 nexion with the male parts — but to be the organ which secretes 

 the transparent glairy matter that envelopes the ova previous to 

 their passing from the body, by which they become attached to 

 the substances on which they are deposited, and which protects 

 them from injury during their evolution. On examining the se- 

 cretion of this gland by the microscope we found no spermatozoa, 

 but instead, a tenacious granular -looking fluid, with broad nucle- 

 ated granular scales of what seemed to be pavement epithelium. 



The ovary and other female parts do not appear to difi'er ma- 

 terially from the above description in E. coronataj E. Drummondi 

 and E. olivacea. 



3rd. Androgynous apparatus : the spermatheca, figs. 1 & 2 ^, 

 lies in front of the ovary between the two lobes of the mucus- 

 gland, and is almost concealed from view by them and by the 

 dilated convoluted part of the oviduct. It is a globular or pyri- 

 form sac, of a dirty olive colour, having one or more accessory 

 sacs, j, attached to its duct ; its walls are thin, but strong and 

 muscular. In E. papillosa and E. coronata it has been found 

 crammed full of a mass of fully-developed spermatozoa and cor- 

 puscles. The spermatozoa, fig. 10 « & 6, consist of a narrow 

 elliptical transparent head often bent upon a long slender tail or 

 filament, which is seen to be either straight or waved, or spirally 

 rolled upon itself. The corpuscles, c, are small, elliptical, and 

 varying in size, many of them having a transverse band, others 

 a cross upon them, apparently indicating a tendency to split into 

 two or four parts as represented in the figure. 



The duct of the spermatheca, i, comes off" from the under and 

 anterior part, and after a very short course forwards empties 

 itself into the oviduct at /, fig. 2, appearing to end there, but in 



