Figures 9-11. 9 in Studies on spider respiration and circulation by Victor Willem

Figures 9-11. 9, Nearly horizontal section of Pholcus, at the level of the top of the left lung (X 75). c, anterior part of the heart; d, a cul-de-sac of the digestive gland; v, pulmonary vein; p, tips of the most dorsal pulmonary lamellae; m, muscle; s, portions of the opisthosomal conjunctive sac. 10, Section parallel to the previous one, at the level of the upper part of the pulmonary vestibule. Letters as in the previous figure: v, upper border of the pulmonary vestibule; lv, ventral sinus; M, muscle inserting on the posterior end of the tergal piece of the pedicel; k, bands of the conjunctive sac. 11, Section parallel to the previous ones, towards the middle of the spiracle. t, tergal piece of the pedicel; m, M', various longitudinal muscles inserting posteriorly on the walls of the anterior region of the opisthosoma, and anteriorly on the pedicel; s, spiracle; p, pulmonary lamellae, encountered almost parallel to their surface: they are more or less triangular laminae, stretched between the ventral sinus (to the walls of which they emit fine conjunctive fibers) and the efferent pulmonary sinus (le); posteriorly, they end with a free edge in the pulmonary vestibule.