246 MESSES. COLLINGE AND GODWIN- ATISTBK ON [Mar. 19 , 



along the inner side of the penis and on the side of the vagina 

 and free oviduct. The reti'actor muscle has its attachment some 

 little distance below this, close to the point where the thickened 

 flagellum (calc-sac) terminates (fig. 23). The interior lining of the 

 flagellum has a beautifully papillated surface (fig. 24), the raised 

 portions being renate in form and directed forwards, somewhat 

 like the teeth of a coarse file. The prostatic and ovi ducal canals, 

 forming the common duct, are thrown into a series of sharp folds, 

 which are not without some difficulty unwound. The albumen- 

 gland is large and somewhat pyriform in shape. The herma- 

 phrodite gland is a small oval-shaped body with a short thin tube 

 attached — the hermaphrodite duct. The amatorial organ (fig. 22) 

 has a sharp coil about midway in its length, with the large 

 swelling glandular mass above ; immediately below the coil, where 

 the sheath nai'rows, is a calcareous dart (fig. 25) funnel-shaped at 

 the base. 



IV. MlCROPAEMAEION SIMEOTHI, n. Sp. 



Shell (fig. 28) oval in form, solid, olivaceous amber-colour, the 

 lines of growth very strongly and regularly marked ; apex small, 

 white with a deep suture. There is an indication of its having 

 had two and a half whorls when very young, the last whorl being 

 covered again by the more mature and later formed shell of the 

 last whorl. 



Major diameter 17millim., minor diameter 10 millim. 



Animal (figs. 26 to 29). Colour variable, posterior portion 

 mottled with chocolate and brown ; median region yellowish 

 brown ; anterior and dorsal regions similar, with two very con- 

 spicuous black bands, one on either side of the head, separated 

 from a central black band, which passes between the tentacles over 

 the head, by pale lines running from the base of the tentacles. 

 The sides of the head and foot are mottled and spotted ; mantle 

 also, but to a much greater extent. Shell-lobes closely papillated. 

 Foot- sole divided into three planes, of which the median one is 

 the largest, all marked with faint transverse lines ; foot-fringe 

 marked with broad chocolate-bron n lineoles. Immediately above 

 the foot-fringe is a distinct line or groove, which marks off the 

 whole of the upper portion of the animal from the foot-sole 

 (fig. 29). 



Length in alcohol 31 millim., breadth of foot-sole in the anterior 

 region 5 milUm. 



Hahitat. Paka Paka, Kina Balu (10,000 ft.), on leaves {A. H. 

 Everett). 



With this species we have associated the name of Dr. Heinrich 

 Simroth, the distinguished malacologist of Leipzig, and founder of 

 the genus. 



1. Anatomy, 



Visceral Mass, Sfc. — The salivary glands are similar to those 

 described in Mieropnrmnrion polJonerai, as are also the iaw and 



