Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . & Inoma (1971: 139, pi. 23(figs 1-3), text-figs 5-7) are derived from an involute coUignoniceratid, prob-ably Subprionocyclus (see Reyment 1975). The ornament of the twogenera differs only in the presence of both inner and outer ventrolateraltubercles in the latter. The suture of Subprionocyclus ( Matsumoto 1965,text-figs 28-30) already shows the asymmetry of E/L, that is so distinctivelydeveloped in Reesidites. The ornament of Reesidites minimus differs little from that of Barroisicerashaberfellneri (von Hau
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . & Inoma (1971: 139, pi. 23(figs 1-3), text-figs 5-7) are derived from an involute coUignoniceratid, prob-ably Subprionocyclus (see Reyment 1975). The ornament of the twogenera differs only in the presence of both inner and outer ventrolateraltubercles in the latter. The suture of Subprionocyclus ( Matsumoto 1965,text-figs 28-30) already shows the asymmetry of E/L, that is so distinctivelydeveloped in Reesidites. The ornament of Reesidites minimus differs little from that of Barroisicerashaberfellneri (von Hauer) (compare Fig. lA and Fig, IB-D), being a little moreflexuous in Reesidites and projected strongly forward on the ventrolateralshoulder rather than straight. The sutures differ more obviously; in B. haber-fellneri there is no comparable asymmetry (see Fig. 2). However, the typespecimen of Itwebeoceras lornae van Hoepen, 1968, described below, has theornament of Reesidites without sutural asymmetry. Taken together these obser- 244 ANNALS OF THE SOUTH AFRICAN MUSEUM. ?^??^^
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
