EXPLANATION OF PLATE VI. 
Figs. 
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I — 6 . — Specimens of Dichelaspis angulata from the Bay of Bengal — 
Figs. I, la, 2. — Form with short, stout scuta, with or without a carina, 
with relatively large chitinous points. 
, , 3. — Form with a rudimentary carina and with slender scuta, the lower 
extremities of which are produced into a fine chitinous filament. 
,, 4. — Form without a carina, with the scutum markedly sinuous; the 
aperture transverse. 
,, 5 j 5 ^- — Form with stout, curved scuta and a well-developed carina. 
,, 6. — Forms with slender scuta with distinct basal branches; carina 
rudimentary. 
7 — 10. — Specimens of Dichelaspis cor from a single crab, illustrating variation 
in the direction of the aperture and in the concentric lines on the 
external surface of the capitulum. 
II — 13. — Specimens of Dichelaspis geryonophila from the Laccadive Sea (from 
Geryon appuis). 
14, 15. — Specimens of D. geryonophila from Martha’s Vineyard, New Jersey. 
All these individuals are from one specimen of Geryon quinquedens, 
but those represented in fig. 15 are the types of the variety 
fissicarina. 
