More brachiopods! The spiral lophophores are a filtering apparatus. 

Image 1: “Fig. 8. Hypothetical representation of efficiency of the filtering system of some extinct spire-bearing brachiopods showing flow patterns and extension of area for trapping food resources. Inhalant and exhalant currents according toVogel (1975) and diagram modified from Ager and Riggs (1964).”

Image 2: “Fig. 9. Hypothetical representation of efficiency of the filtering system present in extinct productid brachiopods showing flow patterns and extension of area for trapping food resources. Inhalant and exhalant currents as in a similar model proposed for Falafer Grant (1972) and diagram modified from Brunton et al. (2000) without including his interpretations.”

Source: 

Pérez-Huerta and Sheldon. 2006. “Pennsylvanian sea level cycles, nutrient availability and brachiopod paleoecology.” Palaeogeography, Palaeoclimatology, Palaeoecology. Volume 230, Issues 3–4, 30 January 2006, Pages 264–279. http://dx.doi.org/10.1016/j.palaeo.2005.07.020

http://www.sciencedirect.com/science/article/pii/S0031018205004451

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