Mr. Nbwport on the Clem Myriapoda, Order ( bilopodsL 351 



have been reproduced ; in which case they would most likely be shorter than the 



original ones. The character derived from the spines oo the Bcutella hi of wry 



doubtful utility. The most constant specific character I have yet met with, in 

 addition to that first noticed by Mr. Templeton, ii the relative length of the 

 first and second basilar joints of the metatarsi t. more especially of the meta- 

 tarsi of the posterior pair of legs. This character is of more value than that 

 which is derived from the length ol* the posterior legs alone, or of the auteima\ 

 the extremities of which are fragile, and are frequently lost In regard to 

 colour, it yet remains to be ascertained whether this differ! in the tw 

 or whether even it varies in different individuals of the same sex. Prom the 

 few opportunities I have yet had of comparing the sexes, I am inclined to 

 believe that the colour and markings on both are very similar. 



Family 1. Cermatnd.k. 



The characters of the Cermat'iida- arc distinctly marked. The head 

 (Tab. XXXIII. fig. 36.) is very large and transverse, the eyes (*) tuberose 

 and aggregated: the basilar region almost absent (a,c), and coalesced with 

 the enlarged cephalic (a). The mandibles are large, distant, and forcipated 

 (/to m) ; the palpi elongated, and armed with spines; the labial teeth long 

 and acute ; and the antenna? very long, setaceous, and formed of a great mul- 

 titude of joints. 



The body is covered by eight dorsal plates or scutella (fig. 37.), the posterior 

 border of which is rounded (p), deeply emarginated in the middle, thickened, 

 and perforated by a longitudinal orifice or stoma (o). The margins of the plates 

 are everted and armed with minute spines, and the surface is usually roughened 

 with parallel series of spinulse. The sides of the body are furnished with nine 

 pairs of spiracles, as in the Insecta, the entrances to the tracheal vessels. The 

 anal extremity has a double outlet, and the external organs of reproduction 

 in the female areexertile, and are armed with a pair of forceps (Tab. XXXIII. 

 fig. 38.; ; and in the male with two pairs of short styliform appendages. 



The organs of locomotion consist of fifteen pairs of legs, each articulating 



t In the first part of this paper (page 283-284) the joint that articulates with the tibia has been 

 described by mistake as the metatarsus instead of tarsvs, and the remaining joints as tarsal instead of 

 metatarsal. 



VOL. XIX. 3 A 



