COLLINGE : NEW MICROPARMARIONS. 1 7 



Mieroparmarion mbllendopffl, n. sp. Pi. i, figs, i— 6. 



Animal a dark blue, excepting laterally just behind the head, and 

 on the dorsum beneath the anterior portion of the mantle, where the 

 ground colour is a dirty yellow. Mantle dark blue, covering the 

 visceral mass from all sides, portion bordering the shell thin. Visceral 

 mass overlapping the posterior portion of the dorsum, which is flattened. 

 Caudal mucous pore a vertical slit not extending to the foot-sole. 

 Keel short and prominent. Rugce small. Peripodial groove distinct. 

 Foot-fringe dark blue with yellow lineoles. Foot-sole yellowish, divided 

 into median and lateral planes. 



Length (in alcohol) 31 millim. 



Shell (PI. I, fig. 3) oval in form, with a slight indication of the 

 apical whorl, borders thin and membranaceous. 



Major diam. 11.5, min. diam. 8 millim. 



Type in my collection. 



Anatomy of the Generative Organs. 



The penis is a thick muscular walled tube, terminating in a beak- 

 like head. In section (PI. i, fig. 5), the lumen is seen to pass to 

 almost the distal end and to widen into two sac-like portions, the 

 upper of which is connected with the vas deferens. Viewed externally 

 the vas deferens is connected with the penis on its ventral side, 

 whilst the retractor muscle is inserted a little nearer the distal 

 end on the dorsal side. The receptaculum seminis has a short duct 

 which enters the vagina on its inner side (PI. i, fig. 4). Above this 

 is the free oviduct, just before it enters the common duct, it 

 becomes more globose and then narrowing suddenly, becomes the 

 oviducal portion of the common duct. The dart-sac (PL i, fig. 4, <./. s.) 

 is a large thick muscular organ sharply bent upon itself. The fundus 

 of the dart is situated at the first bend. The dart (PI. i, fig. 6) is a 

 long calcareous rod which becomes gradually finer at the free end. 



The prostatic and oviducal canals, forming the common duct, are 

 richly folded and partly cover the albumen gland. 



Mieroparmarion andamaniea, n. sp. pi. i. figs. 7—10. 



Animal yellowish with dark mottling laterally, anteriorly the dorsum 

 is light yellow with a dark blue lateral band extending from the head 

 to the visceral mass. Mantle same colour as the body, with well 

 developed keel encircling the visceral mass, mantle covers the visceral 

 mass from all sides, portion bordering the shell thin. Visceral mass 

 overlaps the posterior portion of the dorsum which is flattened. 



