602° Messrs. J. C. Melvill and J. H. Ponsonby on 
Trachycystis centrifuga, sp.n. (Pl. XXXII. fig. 9.) 
T. testa conico-depressa, anguste umbilicata, tenuissima, hyalina, 
periostraco corneo, olivaceo-fusco omnino contecta; anfractibus 5, 
quorum duo apicales grandes, elevati, mamillati, ceteris ventri- 
cosulis, periostraco undique longitudinaliter oblique costellifero 
indutis, interstitiis spiraliter sub lente tenuistriatis, ultimo an- 
fractu ad peripheriam acute carinato et regulariter fimbriato ; 
apertura ovato-lunata, peristomate tenui, margine columellari 
supra umbilicum triangulatim reflexo, basi convexa. 
Alt. 5, diam. 8°75 mm. 
Hab. Maestrém Forest (Farquhar). 
Akin to T. Planti, Pfr., T. actinotricha, M. & P., &c., 
while differing from all in detail. 
Trachycystis glebaria*, sp.n. (Pl. XXXII. fig. 15.) 
T. testa ovata, profunde sed anguste umbilicata, spira depressa, 
tenui, cornea, subpellucida ; anfractibus 5, apice levi, albescente, 
omnibus ad suturas impressis, ventricosis, longitudinaliter minutis- 
sime et arcte striatis, nitidiusculis; apertura lunata, peristomate 
tenui, marginem apud columellarem vix reflexo, 
Alt. 2, diam. 3°50 mm. 
Hab. Pinetown, Natal (Burnup). 
A small but neatly formed species, with much depressed 
whorls, umbilicus narrow but deep, surface horny, seemingly 
smooth, but microscopically longitudinally striolate. Allied 
to T. Glanvilleana, Ancey. 
Trachycystis laticostata, sp.n. (Pl. XXXII. fig. 5.) 
T. testa parva, profunde umbilicata, depresso-conica, tenui, sub- 
hyalina, sed periostraco rudi, fuscato, omnino contecta; anfrac- 
tibus 5, quorum 132 apicales vitrei, leves, globulares, ceteris 
irregulariter et crasse laticostatis, costulis obliquis, rudibus; 
apertura fere rotunda, peristomate tenui, simplici. 
Alt. 2, diam. 4 mm. 
Hab. Maestrém Forest, Bedford, Cape Colony (Farquhar). 
Covered with a rough fuscous-black epidermis, and pecu- 
liarly rudely and broadly ribbed for so small a shell. 
Trachycystis oreina t, sp.n. (Pl. XXXII. fig. 8.) 
7. testa parva, conico-pyramidata, obtecte umbilicata, albo-cinerea, 
tenui, periostraco fusco-olivaceo, omnino contecta; anfractibus 5, 
* Gleba, a small clod of earth, from the resemblance. 
T opeivos, inhabiting heights. 
