EXPLANATION OF PLATES. 



Plate XIII., p. 183, fig. A. — Silk lining of tube of Atypuspiceus (Sulz.), taken 

 at Troyes in Champagne, and communicated to me by M. E. Simon ; 

 B, drawing of portion of nest of Cyrtaucheaius elowjatiis (Sim.) made 

 after the description of the discoverer, and subject to his (M. E. Simon's) 

 con-ections. This is the only illustration in the present work not taken 

 from an actual specimen. These figures are of the natural size. 



Plate XIV., p. 193. — Diagrams of the known types of trap-door nest. 

 Fig. A, nest of Atypus piceus (Sulz.) ; B, nest of cork type; B 1, the 

 layers of silk with earth rims of which a cork door is composed ; C, 

 single-door unbranched wafer type ; D, single-door branched wafer 

 type; E double-door iinbranched wafer tyjje ; E 1, lower door of the 

 same, of the natural size ; F, Hyeres double-door branched wafer tyjie ; 

 F 1, lower door of the same, of the natural size ; G, and G 1, double-door 

 branched cavity wafer type. At G 1 the perfect type is seen, while 

 at G, the descending cavity, the outlines of which are indicated l)y 

 dotted lines, has been filled up ; G 2, lower door of the same of the 

 natural size. (Figs. A, B, C, D, E, F, G and G 1, diagrammatic represen- 

 tations of nest on a reduced scale, Figs, B 1, E 1, F 1 and G 2, of the 

 natural size). 



Plate XV., p. 198, fig. A. — Nest of Cteniza Calif ornlca (Gamb.) nearly 

 entire, enclosed in the clayey earth of the bank from which the specimen 

 was taken, the door being artificially represented as being partly open ; 

 A 1, door of the same as seen when closed ; B, Cteniza Californica 

 (Camb.) from a li^^ng specimen ; B 1, the same seen in spirits, the legs 

 not represented; B 2, the same seen sideways; (figs. A, A I, B, B 1 

 and B 2, are of the natural size) ; B 3, the eyes, greatly magnified ; 

 B 4, the three claws terminating the tarsal joint of the hindmost 

 left leg; B 5, line representing the measured length of the spider 

 excluding the falces and spinners, the iippermost division gives the 

 length of the caput terminating at the half-moon-shaped fovea, the 

 middle di\dsion that of the thorax, and the lowest that of the abdomen, 

 while the transverse line gives the breadth of the cephalothorax ; 

 B 6, eggs laid by the spider in captivity on the under side of the gauze 

 which covered the box (the position is reversed here) of the natural 

 size; B 7, the same magnified; B 8, another group of eggs, magnified; 

 B 9, a portion of the same still more highly magnified; B 10, lines 



