Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . eam and bear strong conical umbilico-lateral tubercles housed in notches in the umbihcal wall of the succeedingwhorl. As size increases this tubercle migrates outward to a lower lateralposition. The ventrolateral and ventral region is visible only from a diameterof 60 mm; in SAM-D1188C the tubercles are seen to give rise to single ribsor, more rarely, pairs of ribs, which terminate in a blunt, low, obliqueventrolateral clavus. The outer whorl bears twenty primary ribs arising at the umbilical seamand bearing a strong
Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum . eam and bear strong conical umbilico-lateral tubercles housed in notches in the umbihcal wall of the succeedingwhorl. As size increases this tubercle migrates outward to a lower lateralposition. The ventrolateral and ventral region is visible only from a diameterof 60 mm; in SAM-D1188C the tubercles are seen to give rise to single ribsor, more rarely, pairs of ribs, which terminate in a blunt, low, obliqueventrolateral clavus. The outer whorl bears twenty primary ribs arising at the umbilical seamand bearing a strong conical lateral tubercle at the beginning of the whorl. Thisdeclines progressively, leaving only strong inner flank ribs in SAM-D1188B at adiameter of 100 mm. and a small, somewhat bullate midlateral tubercle inSAM-D1188C at the same diameter. In both specimens this tubercle gives riseto a broad, prorsiradiate concave rib that declines and effaces over theventrolateral shoulder, leaving a smooth or gentlv undulose zone on either side 316 ANNALS OF THE SOUTH AFRICAN MUSEUM. co c U
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
