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Proceedings of the Royal Society of Edinburgh. [Sess. 
rounded ; the lateral expansions clearly appear in the side view only. 
Almost in the middle of the outer margin is a conspicuous process, with its 
rounded end pointing backwards and tipped with a seta (p., fig. 9). Inwardly, 
on the posterior surface, are a dozen thick hairs. Below the process the 
Fig. 10. — Calyptophyllum ohvolvatum, n. sp. Eight gonapod, 
outer profile. Mr.^ Mesomerite ; S., solenomerite ; t., tracheal 
stalk ; n., notch ; m., triangular lamella of mesomerite ; 
m! veil-like lamella of solenomerite; c. , horse-shoe-shaped 
coxal base ; o., trumpet-like process. (In the background 
the apex of the left mesomerite is outlined, Ml.) 
outer margin of the peltogonapod is very poorly chitinised, and unites 
with membranaceous expansions of the mesomerite. From the base of the 
posterior surface rises a very short flagellum, angularly bent proximally so 
as to cross the flagellum of the symmetrical organ (/.); it ends in a brush 
of spines. The tracheal stalks (^.) are simple, short, and attached some 
distance above the base of the organs. 
The two gonapods are united by hard membranes in which no trace of 
a sternal plate could be detected. Each gonapod is deeply split into a long 
