243 
The reproductive organs open on the ventral surface. The female 
orifice, which is just back of the mouth, leads into an antrum femininum 
into which two chitinous “mouth-pieces” open. These “mouth-pieces” 
lie symmetrically on each side of a large bursa seminalis (fig. 2, mp 
and bs) and are slightly curved in the characteristic horn-shape found 
in A. cinereus. The ovaries extend, on each side as far forward as the 
frontal gland. 
fgl. 
Fig. 2. Diagram of sagittal section of Amphiscolops fuligineus, showing f.gl, frontal 
gland; ov, ovaries; t, testes; p, penis; bs, bursa seminalis; mp, “mouth-piece”; 
mo, mouth; fd, ingested food. 
The male reproductive apparatus consists of a compact ovoid penis 
surrounded by a sheath and glands. The canal of the penis leads into 
the vasa deferentia. The testes are follicular and scattered. The sper- 
matozoa are long and threadlike in form. 
IT. 
Fam. Convolutidae. 
1. Gen. Aphanostoma Oerst. 
Aphanostoma pulchella (Uljanin, non A. pulchella mihi, Pereyaslawzewa). 
This small and very lively form occurs at intervals in great numbers, 
and then disappears to return again after a brief period. It is extre- 
mely sensitive, remaining alive in the laboratory less than 24 hours. The 
species found by Uljanin and named by him Nadina pulchella seems 
to correspond exactly to the Neapolitan form, while that termed by 
Pereyaslawzewa Aphanostoma pulchella differs in form and color. 
The body is characteristically pear-shaped (fig. 3) tapering poste- 
riorly to a small tail. The length is 0,5 mm. The color is a pale canary 
yellow, and in the region of the statocyst much concrement and small 
drops of oil are found. In transmitted light the concrement appears 
16* 
