K I. Smith — Eiirhj Sfaijes of Hippa falpoUhi. .'{'20 



nearly tlic saiiu' form as in tlio adult, and has ajtparcMitly fully 

 acquired the adidt funetion. 



The tliree pairs of maxillipeds (Plate XLVII, %. 4, 6, 7) have 

 assumed so nearly the adult form that detailed descriptions of them 

 are unnecessary. 



As in the adult, the anterior lol)e of the protognath of the first 

 maxillipeds (Plate XLVII, fig. 4, fi) is very much elongated ; thi' 

 straight inner margin is thickly beset with plumose sette throughout, 

 and with an additional series of much longer setae on the posterior 

 half, and also at the extremity. The endognath seeins to be repre- 

 sented only by the long, slender, and soft appendage (^), apparently 

 arising from near the base of the inner side of the stout, two jointed 

 exognath (c). The basal segment of the exognath is nearly as long 

 as the distal lobe of the protognath, while the terminal segment is 

 somewhat shorter, but fully as broad, and thickly marginal through- 

 out with plumose setse, which become very long at its extremity. In 

 the adult, the terminal segment is more triangidar in outline and the 

 tip is more acute. 



The endognath in the second pair of maxillipeds (Plate XLVII, 

 fig. 6, (i) differs in form slightly from that of the adult, being propor- 

 tionally stouter and less flattened ; the terminal segment, in partic- 

 idar, is proportionally, considerably shorter and consequently more 

 tapering. The basal segment of the exognath (6, fig. 6) is not so 

 much narrowed distally, and the oval, terminal segment is a little 

 narrower than in the adult. 



The broad, opercular, external maxilliped (Plate XLVII, fig. 7) is 

 transversely truncated at the distal extremity where the ]>alpus 

 articulates, wanting almost wholly the conspicuous, rounded promin- 

 ence of the anterior angle, just within the articulation, in the adult; 

 and the posterior angle of the inner margin is less prominent and 

 more broadly rounded. The palpus is much less slender, less com- 

 pressed, and the terminal segment is proportionally shorter than in 

 the adult. 



The thoracic legs, like the maxillipeds, are so mucli like those of 

 the adult, both in form and function, that detailed desci-iptions of 

 them seem needless here. The anterior pair (Plate XLV, fig. 5) are 

 a little more slender than in the adult, and the terminal segments, or 

 dactyli, are not quite as thickly margined Avith plumose setfe. The 

 second and third pairs are almost exactly alike and, together with 

 the fourth pair, are specially adapted for burrowing. The fourth 

 pair differ from the second and third principally in having the two 



