CONCIIOLOOY. IGl 



Tho true Pulmonata are nearly twice as numoroiis as tlic operculntecl land shells, 

 and comprise, in tlie same manner, forms belonging; to several families, although by 

 far tho greater jiortion are included amongst the IIdici(l<e. The forms referred to 

 the TcatacdUdce differ greatly from the typical genus, a carnivorous tyise of slug. 

 But little is known of the habits of Streidtixis and Eimea ; the former a peculiar 

 hyaline shell more or less depressed, and with the lower whorls excentric from the 

 axis of the upper, so as to have a remarkable appearance of distortion ; the latter 

 also liyaline but turrited or pupiform. Both have a peculiar bicoloured animal, red 

 and white, or yellow. 



The only true slug, Limax viridis, yet described from Burma is so imperfectly 

 known that its generic relations are obscure; it is a small green species inhabiting 

 mangrove bushes. The genus Hdicarion however comprehends several slug-like 

 moUusou, having the animal much too large for complete retraction into the shell, 

 which is somewhat ear-shaped, thin, and with high lustre. I'ttriitopsis is another 

 VitrinaAiki.' genus. An'oji/uinta is reversed, depressed and thin, with a sharp keel. 

 M(icrochliiiii)/s is composed of smooth discoid or subdiscoid shells, all very thin, with 

 a thin lip and high lustre. The animal is provided with long linguifurm processes 

 to the mantle, and these processes, whilst the animal is crawling, are reflected over 

 the uppi^r surface of the shell. The relations of tho shells referred to Naniim are less 

 accurately determined, all are more or less discoidal, but with some sculpture above. 

 Sitah consists of thin turbinate or subconical species, usually with some sculpture. 

 Ucmiplecta of comparatively large subdiscoid shells, sculptured above, smooth below. 

 Snphina is a genus of discoid or subdiscoid species, smooth, thin, and resembling 

 ]\Iacrochhimijs, but remarkable for ha\-ing a slit-like groove in the margin of the mouth 

 below, near the axis of the shell. Sesara is lenticular or discoidal, ribbed transversely 

 to the whorls above, smooth below ; there are usually teeth in the mouth, and the lip 

 is more or less thickened. Trochomorpha comprises thin, lenticular shells, very 

 shaqdy keeled. Pkctopylis consists of thick discoid shells, for the most part quite 

 flat above and concave beneath ; the lip is thickened and often toothed, and there is 

 a remarkable barrier formed by teeth aii<l transverse laminae in the whorls some 

 distance behind tlie aperture. The true Helices found in Bm-ma are not numerous, 

 and are mo.stly distinguished by having the margin of the aperture slightly expanded; 

 the majority are flat shells, butZT. eapitiuin is conical and finely coloured. H. hifoveata 

 is concave both above and below. The animals of the genera Ilelicurion, Vilrinopsis, 

 Ariophanta, MacrocMamys, Nunina, Hitala, IFemipleeta, Sophinia and Sesara have a 

 large glandular dejjression sometimes, as in Macroclilamys, with a projecting lobe 

 above, at the posterior extremity of the creeping disk or ' foot.' This is extremely 

 minute in Trochomorpha, and wanting in Uclix and FTcctnpyiis ; se\'eral other pecu- 

 liarities of structure, such as a groove running along the edge of the foot, are also 

 characteristic of the former group. 



The otlier genera of the IMicidcc are distinguished, as a rule, by being much more 

 elongate or turrited. Ainpliidromus comprises some large handsome species conically 

 ovate in form, lemon yellow in colour in parts, usually classed as Bultmina. Some of 

 these shells are worn as an ornament by women in parts of Tenasscrim. Hfenogyra 

 gracilis is a small white lustreless turrited shell, common throughout India and 

 Burma : the animal is lemon yellow. Glessula, commonly classed as Acliafina, consists 

 of thin, horny, highly polished species, some with short, others with high spires. 

 The mouth ends in an imperfect channel, which appears as if truncated below. 

 Hapalas consists of whitish subovate shells of moderate size. Fupa of minute ovate 

 forms, the mouth usually denticulate. Hi/pselostoma is conical, or subdiscoidal, with 

 the mouth free, expanding, and not opening, in the usual dii'ection, but turnt'd 

 upwards or forwai'ds. Clausilia is a turrited shell reversed, with teeth in the mouth, 

 the peculiar sub-genus Oospira consisting of thick ovate shells, whilst in JVeiiia, 

 a South American subgenus rejjresented by one form in Pegu, and another in Upper 

 Burma, the mouth is free and expanded. 



The VeroHicellidfc are shell-less mollusks covered with a thick coriaceous 

 mantle; the breathing and other orifices below the margin. The Succineido', or 

 amber snails, are named from their colour. They are thin shells, with largo 



U 



