XVII. ON THE ANATOMY OF ATOPOS 
(PODANGIA) SANGUINOLENTA 
(Sane Z. KA... MS). 
By EKENDRANATH GuosH, L.M.S., B.Sc., Assistant Professor 
of Biology, Medical College, Calcutta. 
(Plates xxv—xxvii.) 
INTRODUCTION. 
The present article is based on several specimens of a slug 
collected more than forty years ago by the late Dr. F. Stoliczka 
in Penang! and at present in the possession of the Indian Museum. 
They have been placed at my disposal through the kindness 
of Dr. N. Annandale for anatomical investigation. Although 
left in alcohol for so many years, the animals were still in such 
a good condition as to allow me to make out the anatomical 
features in full detail with a few exceptions only. Having 
access to Simroth (12) and Collinge’s (3, 4, 5, 6) publications, I 
took the opportunity of comparing the anatomy of other species 
of Atopos (of which Podangia is a subgenus) with that of the 
present species. As the animals had not been lately identified, it 
was necessary for me to consider the external characters fully and 
in minute detail, including the coloration. Unfortunately the 
colours of the animals have probably faded through long immersion 
in alcohol, but I have described them as they are at present. 
Before passing on to the anatomy at once I shall. try to 
find out the positions of the animals and the genus to which 
they most probably belong. 
The specimens were placed in the family of Vaginulidae 
(Veronicellidae, Gray), order Pulmonata, under the name of 
Veronicella sanguinolenta by Stoliczka.* In 1891 Simroth in 
his admirable monograph (12) defined a new genus Atzopos 
which he established for three species of Vaginula, Latrille, 
1 Apparently he obtained the specimens in the ‘t more wild and deep ravines 
of the north-western part of the island.’’ (Journ. As. Soc. Bengal (2) XLI, 
p. 261 (1872). 
2 Stoliczka probably referred to these specimens in his paper on the mollusca 
of Penang (1873), but he only named them in MS. Collinge in ‘*‘ A CHECK List 
OF THE SLUGS,’’ published by Cockerell and himself (3), writes on page 223 
‘* Atopos pulverulentus apparently includes a specimen in tne British Museum from 
Penang (Theobold), marked ‘V. sanguinea, Stol.’ It has the body beautifully 
marbled with black and grey, the sole pale orange-tinted. Length about 54 mm. 
Bluntly keeled.’’ No date is assigned to A. pulverulentus, Benson, on page 195 
of the same paper and I am unable to trace the description. 
