Archive image from page 127 of American spiders and their spinning. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits CUbiodiversity1121211-9770 Year: 1889 ( 120 AMERICAN SPIDERS AND THEIR SPINNINGWORK. to as 'sternal cones,' or simply 'cones' (). The labium (lab) and maxillae (rax) are also shown in Fig. 92. VII. The parts of the abdomen referred to in description are as follows: The dorsum (Fig. 93, do) is the rounded top of the back, of which the anterior part is called the 'base'
Archive image from page 127 of American spiders and their spinning. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits CUbiodiversity1121211-9770 Year: 1889 ( 120 AMERICAN SPIDERS AND THEIR SPINNINGWORK. to as 'sternal cones,' or simply 'cones' (). The labium (lab) and maxillae (rax) are also shown in Fig. 92. VII. The parts of the abdomen referred to in description are as follows: The dorsum (Fig. 93, do) is the rounded top of the back, of which the anterior part is called the 'base' (ba), and the posterior the 'apex' (ap). The 'folium' (fol) is a leaf like figure which usually occupies one-third or more of the middle part, extending longitudinally from base to apex. The median line (mn) of the dorsum often has a deeper shade of color than the edges of the folium. The blackish ' pits,' or round dark spots (pt), symmetrically arranged in pairs on each side of the median line of the folium, indicate points of attachment for internal muscles. The venter (vn, Fig. 94) is the part lying between the epi- gynum (ep) and gills (gi) and the spinnerets (sp); pits or dimples may also be seen on the venter sy in metrical by arranged as on the dorsum. The median ventral band is usually bordered by a AllUOMKN AND I'AHTS. Fib. 93. Dorsal view; pd, pedicle uniting to cephalothorax; ba, base or Strip of lighter Color fore part; , dorsal cones or shoulder humps; fol, folium or dorsal nlorp or lpoo broken pattern ; ap, apex ; sp, spinnerets ; pt, pit marking insertion of muscles; mn, median line of dorsum. Fib. 94. Side view; vn, venter; ep, epi- When the abdomen is gynum; gi, breathing gills; other references as above. ,. • i j , ,-, tlic space between the dorsal and ventral apex is known as the apical wall of the abdomen. On cither side or shoulder of the dorsal base some species have conical prominences known as dorsal cones or tubercles (). These are
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