186 A HISTORY OF RECENT CRUSTACEA 
the last segment; each side of this band the mottlings are 
fewer, and the surface somewhat hairy. The last segment 
and the appendages of the preceding one are thickly 
specked with reddish brown; their edges are fringed with 
grey hairs.’ lLeach’s statement that Upogebia stellata 
makes winding horizontal passages in the mud, ‘ often of 
a hundred feet or more in length,’ appears still to await 
confirmation. 
A second British species was named Gebia deltdéura by 
Leach, on the ground that the interior lamella of the tail- 
fan is ‘truncate and formed like the Greek Delta.’ No 
doubt he was alluding to the inner brauch of the uropods. 
This is an obscure feature on which to base the specific 
name, and Bell has been not unnaturally misled into sup- 
posing that Leach was referring to the telson, which, how- 
ever, is not at all deltoid in form, and which Leach himself 
expressly describes as ‘ quadrate’ and ‘nearly quadrate.’ 
According to Leach ‘ this species lives with G. stellata,’ and 
Bell suggests that it is probably identical with it. The 
Mediterranean ‘ Gebios littoralis,’ Risso, is a nearly allied 
species, which ranges to the coast of Norway, and may 
therefore be expected to occur in intermediate waters. ‘The 
name Gebia no doubt signifies ‘life in the ground,’ and 
Upogebia ‘ subterranean life,’ in allusion to the burrowimg 
habits which make specimens of the genus rare. The young 
ones, however, may be taken pretty plentifully at the sur- 
face, and Sars has in consequence been able to describe the 
first larval stage or Zoea-form, the second or transition 
from Zoea to Mysis stage, the third or Mysis-form, the last 
larval stage, and the first post-larval stage of adolescence 
(see Plate 1X.) From these descriptions it will be seen, he 
observes, that Gelia in some respects is very distinct from 
Nephrops and Calocaris, two of the genuine Macrura which 
he had previously been examining, as well as from all the 
Carides, while in several points of development it ap- 
proaches the Anomura. In the Carides as in Calocaris the 
rule appears to be that the first larval stage or Zoea form 
is characterised by the presence of three pairs of well- 
developed swimming appendages, representing the exopods 
