S. T. Snrit}) — J^arly Sfafies of Hippo, talpotda. '.\\1 



{a, fig. 1 1) is small and ti|)])t'(l with tliroc long seta\ Tlie outer lobe 

 [h, fig. 11) is broader than tlie inner and armed at the extremity 

 with three nearly equal, long and slender teeth, of which the distal 

 one appears like a process from the margin, showing no line of artic- 

 ulation at its base. The palpus ('*, fig. 11) is very small, composed 

 of a single segment and tipped with a long, plumose seta. 



The second pair of maxilla? (Plate XLYII, fig. l) are very imperfect. 

 The protognath (</, fig. 1) is a small, obtuse lobe tipped with three 

 short setse. The scaphognath (<■% fig. 1) projects beyond it anteriorly 

 as a slightly larger lol^e, while posteriorly it is broad but short and 

 truncated, and the anterior lobe and the oi;ter edge are, as yet, alone 

 furnished with seta?. 



The first and second pairs of maxillipeds, or natatory legs, (Plate 

 XLV, fig. 1, second pair) are similar in structure to those of most 

 zoea^ and differ only slightly from each other. In both pairs the basal 

 portion, or protognath, is alike stout, about as long as the exognath, 

 and unarmed, except by three or four minute setfe on the distal portion 

 of the inner margin. The exognaths, or natatory branches, alike in 

 both pairs, are nearly cylindrical, but flattened at the tips, where they 

 each bear a series of eight slender, plumose setae, which, in the middle, 

 are as long as the exognath itself but decrease in length to the outer 

 ones, which are scarcely more than tw^o-thirds as long. The inner 

 branch, or endognath, in both pairs, is composed of four cylindrical 

 segments subequal in length. In the first pair, however, the inner 

 branch is shorter than the exognath, while in the second pair it is 

 considerably longer. In both pairs the three proximal segments of 

 the endognath are each ai-med with two or three small setje on the 

 inner side, and the distal segment, which is much more slender than 

 the others, is tipped with four setae, of which two are nearly as long 

 as the segment itself and pectenated with minute, setiform spinules 

 along one side, and the two others shorter and apparently unarmed. 



The third pair of maxillipeds and the four antei-ior pairs of thoi-acic 

 legs are, even at this early state, represented by a series of clearly 

 defined, though entirely nnsegmented, processes situated just above 

 and back of the bases of the second maxillipeds and entirely wnthin 

 the carapax, but visible through it, in a lateral view of the animal, in 

 a line nearly parallel with the posterior margin of the carapax. In 

 the single specimen examined, no lobes representing the slender, 

 posterior thoracic legs of the adult could be discovered. Above each 

 of the processes representing the first four pairs of thoracic legs there 

 is a minute, papilliform process apparently representing one of the 

 branchial appendages belonging to these legs in the later stages. 



