Mollusca from South Africa. 603 
apicali globulari, parvo, levi, ceteris apud suturas impressis, 
paullum gradatis, undique longitudinaliter obliquistriatis, striis 
irregularibus, rudis ; apertura lunata, peristomate tenui, margine 
columellari umbilicum triangulatim superimpendente. 
Alt. 2°75, diam. 5 mm. 
Hab. Mountain Drive, Grahamstown (J. Farquhar). 
A plain species with dark brown epidermis and coarse 
irregular ribbing. 
Trachycystis patera, sp.n. (Pl. XXXII. fig. 6.) 
7. testa minuta, depressa, discoidali, perspective umbilicata, elec- 
trino-cornea, tenui; anfractibus 6—7, apicali minuto, levi, ceteris 
arctissime sub lente longitudinaliter striatulis, striis fere rectis, 
apud suturas rotunde excavatis, ventricosulis; apertura depresso- 
lunata, peristomate tenui, simplici. 
Alt. °75, diam. 2°15 mm. 
Hab. Maestré6m Forest, Bedford, Cape Colony (J. Far- 
quhar). 
Minute, but characteristic, and bearing a superficial resem- 
blance in some points to the British Gonyodiscus rotundatus, 
Miill., than which it is much smaller, and very minutely 
and closely longitudinally striolate. 
Trachycystis permeata, sp.n. (PI. XXXII. fig. 2.) 
T. testa profunde et sat late umbilicata, depressa, cinerea, tenui, 
epidermide omnino olivaceo-cornea contecta; anfractibus 5, 
quorum apicalis parvus, globularis, levis, ceteris apud suturas 
rotunde excavatis, ventricosulis, undique arcte longitudinaliter 
obliquiliratis, liris ineequalibus, ultimo ad peripheriam obtuse 
carinato; apertura rotundo-lunari, peristomate tenui, margine 
columellari tenui, simplici. 
Alt. 2°50, diam. 4°50 mm. 
Hab. Pinetown, Natal (Burnup). 
Conspicuous for its depressed contour, deep and fairly wide 
umbilicus, and roundly hollowed out sutures. We do not 
know any species quite comparable. 
Trachycystis scolopendra*, sp.n. (Pl. XXXII. fig. 3.) 
T. testa depressa, paullulum conica, umbilicata, cinereo-fusca, 
hyalina, tenuissima, undique periostraco corneo induta; an- 
fractibus 6, apicali minuto, mamillato, ceeteris periostraco longitu-. 
dinaliter irregulariter obliquilirato preeditis, anfractu ultimo apud 
* Scolopendia, a centipede. 
