First maxilliped of the same : a, inner branch ; 6, outer branch. 
15. Last stage of the zoéa of a Pinnixa, from Newport, R. I. 
Anterior view. 
Posterior view. 
Third maxilliped, cheliped, and ambulatory appendages of the future crab, 
removed from under the carapace of the zoéa : a/, a/!, a’, inner, middle, 
and outer branches of the third maxilliped ; b, cheliped ; c, d, e, ول‎ am- 
bulatory appendages ; g, gills. 
Third maxilliped : a, inner branch (endognathite) ; 6, middle branch (ex- 
ognathite) ; c, outer branch (epignathite) ; d, gill. 
Second maxilla : a, scaphognathite. 
Abdomen : a, b, c, d, first, second, third, and fourth pairs of abdominal 
appendages. 
Second maxilliped : a, inner branch ; b, outer branch. 
First maxilliped : a, inner branch ; b, outer branch. 
First maxilla : æ, inner lobe ; b, outer lobe ; c, palpus. 
a, first antenna ; b, second antenna. 
Metastoma. 
Figs. 9 and 11-15 were drawn from the exuviæ of a zoéa which had changed into a crab. 
PLATE V. Pinnixa. 
First crab-stage of a Pinnixa, from Newport, R. I. (developed at one 
moult from the zova represented on Plate IV. Figs. 5-15). Dorsal 
view. 
The same ; ventral view. 
'l'he same ; abdomen viewed from beneath, with its appendages. 
'The same ; first antenna. 
The same ; first maxilliped. 
The same; second maxilliped : a, endognathite ; b, exognathite. 
The same ; third maxilliped : a, endognathite; b, exognathite ; c, epig- 
nathite. 
Left chela of adult male Pinnina choctopterana from Buzzard's Bay. The 
carapace of this specimen measures 4 mm. in length by 7.5 mm. in 
breadth. 
Right chela of a small adult female of the same. Carapace, 3 mm. x 
5.5 mm, 
BULLETIN OF THE MUSEUM OF COMPARATIVE ZOÖLOGY. 
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