332 *S'. I. SmitJi — Earhj t^tdt/cs of Illppa talpolda. 



beino- considerably curved outward in the middle. The telson is 

 proportionally a little broader than in the adult, — the breadth being 

 rather more than half the length, while in the adult it is usually less, — 

 and much less acute posteriorly and at the anterio-lateral angles. 

 Tlie margin' is sparsely fringed, nearly all round, Avith slender setae or 

 hairs. 



The appendages of the second, third, fourth, and lifth segments are 

 similar, tliough varying considerably in the length of the terminal 

 lamellie. The peduncles, or protopods, of the appendages of 

 the second segment (Plate XLVIII, fig. 5) are stout and nearly as 

 long as the breadth of the segment itself The outer lamella, or 

 exopod, («, fig. 5) is nearly as broad as the peduncle, more than half 

 as long, and margined with about twelve slender, plumose setae (fig. 

 5«), of which the terminal ones are nearly as long as the peduncle, 

 wliile the others decrease in length as they recede from the tip of the 

 lamella. The inner lamella, or endopod, (J, fig. 5) is a small papilli- 

 form appendage, not as long as the diameter of the peduncle, and 

 armed at the tip with a numbei* of very minute appendages, which 

 are apparently only extremely modified spines or setw. These append- 

 ages, as .shown in the accompanying illustrations (Plate XLVIII, fig. 

 6ffl, 6ft), are composed of a cap, shaped like a concavo-convex lens, 

 supported, on the less convex side, by a short peduncle inserted at 

 the margin and nearly vertical to the under surface of the cap. The 

 diameter of the cap. is from -007 to -OOO""" and the height from the 

 surface of the lamella about the same. In alcoholic specimens at 

 least, these appendages seem to be liard and chitinous, and I am at 

 a loss to understand what purpose they serve in the economy of the 

 animal, unless it be as scrapers for the removal of parasites and other 

 foreign substances from some part of the under surface of the body, 

 in which case it is difiicult to see jiist how they could be applied. 



The appendages of the tliird, fourth, and fifth segments differ from 

 those of the second in the successive shortening of the peduncle, but, 

 more particularly, in the successive increase in the size of the inner 

 lamella, which in the a])pendages of the fifth segment (Plate XLVIII, 

 tig. 6) have become more than lialf as long as the outer; the inner 

 laraellse are similarly armed at the tips, and the outer are all alike 

 margined with long plumose sette, of which there are usually a very 

 few more on the posterior than on the antei'ior pairs. 



The appendages of the sixth segment (Plate XLVIII, fig. 4) are of 

 nearlv the same form and ]n'0])ortion as in the adult. The peduncle, 

 or protopod, is stout, broadest distally, and a little longer than the 



