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alveoli anterior apical appear arranged basal base bearing body canine Cape closely coast collection colony consists crown cusp dead described Description developed diameter distal distinct dorsal Durban edge erupted excl face fathoms female figure functional genus give hydrocladia hydrotheca incisors indicate initials inner internode known larger larvae lateral legs length lingual lirae living lobes Localities lower male margin material measurements narrow nematothecae opening pair Palaeontology plate pointed position postcanines posterior present preserved processes publication pupae reaching recorded references region Remarks replacing River rounded segment separate setae shell short shows side similar slightly South African Museum species specimens spines stage Station stem structure surface teeth tooth upper ventral whorls wide zooids Zoology