Generative System in the Genus Testacella. 23 
the direct continuation of that organ. ‘The receptacular duct 
arises from the most anterior portion of the vagina; it is a 
fairly wide tube, which opens into a dilated and slightly 
oval-shaped sac, the receptaculum seminis. The vagina in 
the majority of the Testacellide is of great length. This 
feature is more marked in 7. scutulum and T. Maugei than in 
this species. It is continued as the oviduct and prostate— 
the common duct of many authors. There is a large albumen- 
gland present, which calls for no special mention. The 
hermaphrodite duct is a densely convoluted canal leading 
non the hermaphrodite gland, which is usually of an oval 
orm, 
Testacella scutulum, Sowerby. (PI. I. fig. 2.) 
This species has been classed as a variety of 7. haliotidea 
by most of the writers upon the British Mollusca. 
It was described and figured by Sowerby in 1823, in his 
4 j\ : a ? Pe _ bd 
Genera of Recent and [Fossil Shells.’ Férussac, who in 
the same year examined specimens, came to the conclusion 
that it was but 7. haliotidea, with which view Mr. Sowerby 
agreed, and since then it has been regarded as a variety of 
that species by Gray, Forbes and Hanley, Jeffreys, Rimmer, 
and other authors. It was redescribed as a new species by 
Mr. Tapping in 1856, as Testacella Medii-Templi. In 1886 
Mr. Charles Ashford made anatomical examinations of the 
slug and clearly proved its specific distinctness. An account 
of his work is embodied in a paper previously referred to 
(Journ. Conch. 1888). Although to Mr. Ashford is due the 
credit of having placed this slug in its proper position, the 
above-mentioned account, both description and figures, leaves 
much to be desired. 
The distinctness between vestibule and vagina is scarcely 
perceptible in this species. ‘The upper part ot the vagina is 
dilated in a pouch-like manner, but narrows previous to 
entering the oviduct. ‘The penis is a large muscular organ 
and readily distinguishable from that in the preceding species, 
being rather shorter and always much broader. It opens 
into the vas deferens. There is no flagellum. The penal 
retractor muscle is attached laterally to the penis. The 
receptacular duct leaves the vagina as a broad pouch-like 
organ, and continues as such for quite two thirds of its length, 
when it tapers off suddenly into a narrow and short tube, 
which opens into the small globular receptaculum seminis. 
Judging from the peculiar form of the receptacular duct and 
the internal structure, I think it is very probable that the ova 
