Two new Species of Slugs. 193 



Affinities. 



Externally this species is not unlike a small example of 

 Parmario7i intermedium, Cllge., to which it is undoubtedly 

 closely related. It possesses the same characters in the form 

 of the penis as are common to P. pupillaris, Humb., P. Weheriy 

 Simr., P. Martensi, Simr., P. intermedium, Cllge., P. Everetti, 

 Cllge., and other species, viz, division into three portions, the 

 third or distal one being beak-shaped. The peculiar shaped 

 solid dart is unlike that of any other species of Micro- 

 parmarion or Parmarion. 



Microparmarion constrictus, sp. n. 

 (PI. IX. figs. 6, 7.) 



Externally this species is not unlike Parmarion inter- 

 medium, Cllge. ; it differs, however, from that species in its 

 smaller size, slightly lighter colouring, the smaller size of 

 the mantle- lobes, and the lighter lateral planes of the foot- 

 sole. Godwin-Austen * has previously drawn attention to 

 the few distinguishing characters in the outward appearance 

 of the species belonging to the genus Parmarion, and these 

 apply with equal force to the species of Microparmarion. 



Length (in alcohol) 35 millim. 



llah. Lombok (1500 feet), Borneo {A. II. Everett). 



Anatomy of the Generative Organs. 



The sessile reccptaculum seminis at once indicates this 

 species to belong to Simroth's genus Microparmarion. The 

 penis (PI. IX. fig. 6, p.) commences as a large bulbous 

 organ, which forms the first division ; the second portion is as 

 in other species where the three divisions obtain, while the 

 third terminates in a blunt beak-shaped head. 1'he retractor 

 muscle is attached to the inner side of the third division. 

 The vas deferens passes oflF from the third division of the 

 penis, slightly above the point of separation between the 

 second and third divisions. The free oviduct, as in most 

 species of Microparmarion, is short. The dart-sac is peculiar 

 in form, being much folded and twisted upon itself (PI. IX. 

 fig. 6, d.s.) ', when unfolded it is as represented in figure 7. 

 Tliere was no dart present in the sac, which probably 

 accounts for the manner of folding &c. 



Affinities. 

 There seems to be little relation between this and any ot 

 * Add. & Mag. Nat. Hist. 1896, vol. xvi. pp. 434-437, pi. xix. 



