72 COLLINGE : GENERATIVE ANATOMY OF AMALIA MARGINATA. 



accessory glands are very variable in all species of Amalia. Scharff 5 

 records an example of A. gagates, Drap., in which there were as many 

 as four glands. From the ventral surface of the vestibule the free 

 oviduct passes off as a wide tube. Dorsally the receptaculum 

 seminis and sperm-duct pass off. The receptaculum seminis is 

 exceedingly large, it gradually enlarges in size from its commence- 

 ment, and terminates in a blunt point. The sperm duct in all the 

 specimens I have examined differs from that figured by Simroth. 

 It is V-shaped as in gagates, but the outer arm is the larger, a series 

 of faintly-coloured rings encircle this, which is expanded in a globose 

 manner. The figure given in Lessona and Pollonera's Monograph" 

 (T. ii. f. 14) is poor and not at all characteristic of the species, 

 which might be said of most of the drawings of the generative 

 organs of the species of Amalia there figured. A short vas 

 deferens passes from the apex of the sperm duct and traverses the 

 side of the free oviduct, opening into the prostate. The common 

 duct is richly convoluted, the oviducal and prostatic portions being 

 very distinct. There is a large albumen gland. The hermaphrodite 

 gland is somewhat small and very constant in all the specimens 

 examined, consisting of a series of small glands forming a somewhat 

 triangular mass. The hermaphrodite duct is a fine tube, but little 

 convoluted. 



Respecting the classification of the species of Amalia, I would 

 place the following as well marked and distinct species, both externally 

 and internally they are easily distinguished from one another. 



1. Amalia gagates, Drap. 



2. Amalia margi/iata, Drap. 



3. Amalia sowerbii, Fer. 



4. Amalia gracilis, Leyd. 



5. Amalia robici, Simr. 



6. Amalia cretica, Simr. 



7. Amalia crista ta, Kal. 



I do not say that these arc all the distinct species of the genus, 

 but only those which at present I am able to express an opinion 

 upon. If the external and internal character of these species were 

 better known we should have far fewer so-called new species. 

 Many of the gagates group will, as soon as their anatomy is 

 investigated, be found to be simply varieties of that species. 

 I refer to such forms as/>tumbea, Moq., mediterranea, Ckll., maura? 

 Q. & G., tasmanica and nigricolus, Tate. 



5 Trans. Roy. Dublin Soc, 1891, vol. iv., pp. 513-562, 2 pis. 

 G Monog. d. Limacidi Italiani, 1882, pp. 1-82, T. i.-iii. 



