. Bulletin of the British Museum (Natural History). 74 PITT AND TAYLOR. Fig. 16 Proboscinopora marginata (d'Orbigny), BM(NH) D7982; 16A, bifurcating and anastomosing branches, x 17; 16B, medial autozooecia flanked by kenozooecia whose outlines are not visible, x 32; 16C, origin of a lateral ramification, x 64; 16D, pseudopores, x 290; see also Fig. 17. .. - . Genus PROBOSCINOPORA nov Type SPECIES. Proboscina divisi Vine, 1893; Middle Jurassic, Cornbrash (probably basal Callovian), Thrapston, Northamptonshire. Diagnosis. Colony encrusting with regularly oligoserial branches which may
. Bulletin of the British Museum (Natural History). 74 PITT AND TAYLOR. Fig. 16 Proboscinopora marginata (d'Orbigny), BM(NH) D7982; 16A, bifurcating and anastomosing branches, x 17; 16B, medial autozooecia flanked by kenozooecia whose outlines are not visible, x 32; 16C, origin of a lateral ramification, x 64; 16D, pseudopores, x 290; see also Fig. 17. .. - . Genus PROBOSCINOPORA nov Type SPECIES. Proboscina divisi Vine, 1893; Middle Jurassic, Cornbrash (probably basal Callovian), Thrapston, Northamptonshire. Diagnosis. Colony encrusting with regularly oligoserial branches which may bifurcate and occasionally produce lateral ramifications; basal gynozooecia lacking. Name. Like Proboscina. Remarks. Among Mesozoic and Cenozoic cyclostomes generally referred to the genus Proboscina Audouin, 1826 are several species in which gynozooecia have not been found in spite of the availability of large populations for study. Although recognizing the need for a new genus to accommo- date such multiscrial stomatoporids, Canu & Bassler (1920: 659) followed the tradition of using the name Proboscina while acknowledging that the type species of Proboscina, the Recent P. boryi Audouin, possessed a gynozooecium. In order to 'conserve' the name Proboscina for species without gynozooecia, they erected a new genus Perislomoecia (1920: 692) for ProboscinaAike species possessing gynozooecia. Perislomoecia comprised, as well as its type species Stomato- pora divergens Waters, 1904, two other species, one of which was Proboscina boryi. By this action they made Perislomoecia a subjective junior synonym of Proboscina, and did not solve the problem of the need for a genus to accommodate probosciniiform species lacking gynozooecia. Therefore, the new genus Proboscinopora is here created for species with colonies resembling those of Proboscina but lacking basal gynozooecia. These stomatoporids are characterized by their ribbon-like, narrowly multiserial (oligoserial) branches which m
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