12 DR. HJALM AR BROCH [l918 



the ovaries, and over the basal parts of the mantle. It is evidently 

 the same cells that have been interpreted by Geoffroy Smith 

 (1906) as degenerating ova. The ceimentary gland cells are very 

 large (pl. III, fig. 13—15); their protoplasm is finely granulated. 

 The nuclei are very large; in most cases the nuclei are amoeboid 

 or branched in the gland cells of fullgrown individuals; tbey are 

 richly furnished with chromatic substance, which after treatment 

 with Weigerts haematoxyline — iron ammonium sulphate seems 

 to form an alniost oompact mass of amoeboid shape. In young 

 individuals (pl. III fig. 13) the nuclei have a more regular shape 

 and structure, and may here in this respect somewbat resemble 

 unripe ova. In the small .spe eimen previously referred to there is a 

 large distance betw.een the zone of the cementary glands, and the 

 ovary; the latter as yet only consists of a small number of closely 

 packed ovogonia, and the circumstances here evidently refute 

 Geoffroy Smiths supposition of the cementary gland cells as 

 degenerating ova in Anelasma. — In fullgrown specimens, the nuclei 

 are indistinctly circumscribed, and generally adjoin one or more 

 great vacuoles in the protoplas<m (pd. III, fig. 15), the vacuoles 

 attaining different shape and size, and being very indistinctly 

 bounded. 



Staining with boraxcarmine — bleu åe Lyon gives an interesting 

 picture (pl. V, fig. 24). The nuclei are seen to be rather richly 

 furnished with granular chromatic substance in the shape of 

 smaller or larger nucleoli, somc of them being even of quite con- 

 siderable size; on the other hand, the chromatic substanse here is 

 not nearly so compactly constructed as in preparations stained with 

 Weigerts haematoxyline — iron ammonium sulphate. Also in the 

 sections stained in boraxcarmine, the boundaries of the nucleus are 

 mostly very indistinct. It is obvious that the protoplasm of the 

 gland cells in Anelasma is almost indifferent towards bleu de 

 Lyon; as on the other hand, it has a remarkable affinity to borax- 

 carmine, the protoplasm of the cementary gland cells in this case is 

 rather red, and thus contrasts sharply with the vi oiet tissues 

 remaining. The cementary gland cells of Anelasma dif f er strikingly 

 in this respect from those of Scalpellum, where the protoplasm 

 attains a blueish violet hue owing to its affinity to bleu de Lyon 

 In Anelasma, the protoplasm of the gland cells and that of the cells 

 of the duct also clearly differ, owing to their different affinity to 

 the bleu de Lyon. 



From each of the great cementary gland cells one or two ducts 

 take their departure (pl. III, fig. 15). The wall of the duct consists 

 of a single-rowed cubical eipithelium, and the gland cell surrounds 

 the initial part of the duct like a cap. Only in rare oases do the 

 ducts of two neighbouring gland cells communicate; the ducts 



