Smithsonian miscellaneous collections . ribed by Gaubert(1892) in the legs of spiders. Ellis (1944) showed that this platenormally lies in a horizontal position. A special muscle, the levator. Explanation of lettering on figures al alveolus. <7 guide. an anelli. Ih labrum. at atrium. Ip lunate plate. be bursa copulatrix. ma median apophysis. bd blind tube of diverticle. mJi middle haematodocha. bh basal haematodocha. n notch of median apophysis. bs blind tube of spermathecum. P patella. c coxa. pm posterior median sclerite. cc coupling cavity. pt petiole. cd conductor. r reservoir. cl cheli
Smithsonian miscellaneous collections . ribed by Gaubert(1892) in the legs of spiders. Ellis (1944) showed that this platenormally lies in a horizontal position. A special muscle, the levator. Explanation of lettering on figures al alveolus. <7 guide. an anelli. Ih labrum. at atrium. Ip lunate plate. be bursa copulatrix. ma median apophysis. bd blind tube of diverticle. mJi middle haematodocha. bh basal haematodocha. n notch of median apophysis. bs blind tube of spermathecum. P patella. c coxa. pm posterior median sclerite. cc coupling cavity. pt petiole. cd conductor. r reservoir. cl chelicera. rd radix. cm cymbium. sm sternum. cr carinate ridge of chelicera. sp spermathecum. ct connecting tube. St subtegulum. dv diverticle. tb tibia. ed ejaculatory duct. to tubercle. ef epigastric furrow. tg tegulum. em embolus. tgr tegular ridge. en endite of coxa. tm tethering membrane. f femur. tp tibial process. id fundus. tr trochanter. it fertilization tube. u uterus. V vagina. NO. 4 GENITALIA IN SOME AGELENID SPIDERS—GERING II. Figs. i-6 I, Pedipalpus, left, ectal aspect, Agelenopsis aperta (Gertsch). 2, Pedipalpus,left, dorsal aspect, A. aperta. 3, Mouth region, subventral aspect, A. aperta. 4,Genital bulb, left, unexpanded, frontal aspect, diagrammatic, genus , Receptaculum seminis, diagrammatic. 6, Genital bulb, left, expanded, subectalaspect, diagrammatic, genus Agelenopsis. (For explanation of lettering see p. 10.) 12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121 of the chitinous plate (Ellis, op, cit., p. 47) can draw the plate into avertical position, and thus largely limit the increased haemolymphaticpressure, with its resultant extension, to the femur, trochanter, andcoxa of the leg. The writers observations and dissections indicatethat a chitinous plate plays a similar role in the pedipalpi. Being the longest single segment of the pedipalpus, the femur playsa major role in palpal movements and general orientation of the moredistal genital bulb.
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
