STEREOGENrS LTBYCA. 
the anterior and posterior costals respectively. The distance between the anterior 
neural and the nuchal is 4'6 cm., that between tlie last neural and the suprapygal 
I'O cm. The anterior neurals are much longer than wide, but the series shortens 
Text-fig. 97. 
Carapace aud plastron of Stereoginys libyca : A, carapace ; B, plastron ; C, shell from right side. 
Ent., entoplastral bone ; g., gular shield ; Hg.p., hyoplastral bone ; Hyp.p., h ypoplastral bone ; ig., inter- 
gular shield ; Ms.p., mesoplastral bone ; n., humeral shield ; Nu., nuchal bone ; pect., pectoral shield ; 
Egg., pygal bone ; v. 1-5, vertebral shields ; Xi.p , xiphiplastral bone. \ nat. size. 
(From the Ann. & Mag. Nat. Hist. [7] vol. xi.) 
3" Trat 8I5C 
from before backwards, so that the posterior ones are wider than long, dhey are 
hexagonal in outline, with the exception of the first and last, which are pentagonal. 
