CRYPTOTHIRIA PYGMAA. 261 
ISOPODA. BOPYRIDA, 
NORMALIA, 

CRYPTOTHIRIA PYGM#A.* 
Specific character. — Supposed Male. — Elongate-ovate, posteriorly at- 
tenuated, convex above, concave beneath. Cephalon rather longer than the 
following segment. Anterior pair of pereiopoda strongest; posterior pair of 
pereiopoda long and slender. Sixth or terminal segment of the tail forming 
a minute plate, covering the base of the hind pleopoda. 
Female with the body divided into two portions, the anterior composed of 
the head and three following segments, connected by means of a constriction 

* The woodcut at the head of this article represents the male of C. 
pygmea, and the extremity of its body highly magnified, from specimens 
furnished by the Rev. A. M. Norman. The female C. pygmea (copied 
from Lilljeborg) is the upper left-hand figure ; Rathke’s figure of the young 
C. pygmeea (which, if the form of the antennz be correct, is undoubtedly a 
male of mature form) is copied in the upper right-hand figure ; whilst the 
lower right-hand figure is copied from Lilljeborg’s figure representing the side 
view of the young of L. pygmca, 
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