PSPCA OFFICIALS CONTINUED an investigation yesterday at a house on Front Street near Rockland, in Feltonville, where they found the remains of dozens of animals, apparently used in ritual sacrifices. Investigators, who entered the house to check on reports of abused dogs, found an altar made of the skulls of sheep, goats, turtles and chickens, skeletons of cats, dogs and primates, and a basement smeared with feces. An assault rifle was also recovered at the scene. The owner of the house is in Mexico and will be charged with animal cruelty on his return to the states, investigators said.