The diagnosis of Placostegus porosus in Mörch (1863: 418) is rather reminiscent of Spirobranchus cf. polytrema. ... [details]
"in the coarse upper layer of Oolite [...] at Ancliffe, and have also been found in a similar stratum at ... [details]
"in the coarse upper layer of Oolite [...] at Ancliffe, and have also been found in a similar stratum at ... [details]