Abstract: The hydraulic cylinder apparatus has a crescent shaped length housing a piston of like shape. The crescent shape provides for fit into constrained spaces where a fully cylindrical cylinder cannot fit. Multiple crescent shaped case ring lands with case rings seal the length of the piston proximal to the top of the case. The plurality of piston ring lands and piston rings seal the sliding piston to the walls of the case's internal hydraulic fluid well. The numerous ports of the apparatus, both upper and lower, provide for more convenient application than would otherwise be provided. Hose routing can thereby be best suited to a particular application. An added advantage of the apparatus is the negation of piston and mount rotation, a feature not typically possible with cylindrical hydraulic cylinders.