BULLETIN OF THE 
First 20éa-stage. 
The same, viewed from below : a, labrum ; b, process of the carapace ex- 
tending forward under the eyes; c, mandible ; d, metastoma ; e, first 
maxilla; f, outer branch of first maxilliped ; g, inner branch of first 
maxilliped ; A, outer branch of second maxilliped ; û, inner branch of 
second maxilliped ; %, anus ; J, telson. 
Eye-stalk and eye of the same stage. 
First antenna of the same : a, rudiment of the secondary flagellum ? 
Second antenna of the same: a, b, dentiform processes ; c, rudiment of 
the future flagellum. 
Mandible. 
First maxilla: a, inner lobe ; b, outer lobe ; c, palpus. 
Second maxilla : a, inner lobe; b, scaphognathite. 
Posterior border of the telson ) in. obj.). The arrow indicates the median 
line of the telson. 
A spine and two adjacent denticles of the same, more highly magnified. (1's 
in. obj.). 
Posterior part of the carapace, viewed from behind and below : a, thick- 
ening of the integument at the point where the lateral spines appear in 
later stages of the 2000 ; b, abdominal sinus. 
PLATE IL Porcellana (Polyonyx) macrocheles. 
Last 2000۰ 
Lateral view of the 82, 
Posterior portion of the carapace from below. 
Cross-section of the rostrum. 
Cross-section of one of the posterior horns of the carapace. 
Telson: a, the antecedent abdominal segment; b, the sixth abdominal 
segment of the next stage, showing through the integument of the zota و‎ 
c, d, e, the inner and outer branches of the last abdominal appendages 
and the telson of the next stage showing through the telson of the 
2068, 
First antenna ; a, swelling at the base for the lodgment of the auditory 
organ ; b, inner branch ; c, outer branch ; d, sensory hairs on the outer 
branch. 
Second antenna : a, internal branch (the annuli of the flagellum of the 
antenna of the next stage are seen within) ; b, external branch ; c, out- 
let of the “ green gland." 
Mandible : a, rudiment of the palpus. 
Metastoma. 
First maxilla : a, inner lobe ; b, outer lobe ; و۵‎ palpus. 
Second maxilla : a, scaphognathite. 
Third maxilliped : a, internal branch ; b, external branch. 
The five following pairs of appendages (Decapodal legs) as they appear 
when removed from under the carapace of the zoéa : a, cheliped ; b, c, 
d, e, ambulatory pairs ; f, gills. The chele of the first and fifth pairs 
Se 9 ET 
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