PACKARD.] PHYLLOPODS OF NOETH AMEEICA. 321 



11.5'^™, the abdomen beyond the middle fold of the carapace being 5"^^ 

 long; the carapace was longer and the abdomen much shorter than in 

 the adnlt, but in the number and arrangement of the spines on the tel- 

 son and in the caudal stylets, as well as the eyes and adjacent parts, 

 the Texan ones are the same as the type specimens from Kansas and 

 Matamoras. 



This species may at once easily be distinguished from the other Amer- 

 ican species by the greater length of the carapace, which equals that of 

 the abdomen, also by the smooth telson with its five spines and the 

 rather smooth, slightly spined caudal appendages. The young, one-half 

 an inch in length, have the same proportions of the carapace and abdo- 

 men as in the largest specimens. 



Apus ]vnEWBEEE,Yi Packard. 



Plates XVI, fig. 3, 3a, 36 ; XVIII, figs. 2, 7 ; XIX, fig. 3 ; XX, fig. 1. 

 Jpus newherryi Pack., Amer. Journ. Sc. Aug. 1871. 



Carapace rather longer than in A. longicaudatus and lucasanus^ though 

 leaving about the same number of apj)endages in view when seen from 

 above. The dorsal keel of the carapace is about one-third longer than 

 the distance between its anterior end and the front edge of the carapace. 

 The eyes are rather larger than in A. longicaudatus^ and the post-ocular 

 tubercle is of the same form, though, owing to the larger eyes, not quite 

 so prominent as in A. longicaudatus. The transverse muscular eminence 

 is not so long (antero-posteriorly) as in A. longicaudatus y^heve it i^rwiah. 

 produced xjosteriorly. There are 14 spines on each side of the sinus of 

 the female carapace, the posterior angle of which is a little more obtuse 

 than in A. longicaudatus. Doublure and hypostoma as in A. longicau- 

 datus, the tubercle at the base of the hypostoma not so strongly marked 

 however. The fifth endite of the first i)air of feet reaches only a little 

 beyond the cephalic shield, and only as far as the basal third of the 

 abdomen (that part not covered by the carapace), while in A. longi- 

 caudatus it reaches as far as the middle of the abdomen. 



The second endite unusually small and slender; third and fourth 

 moderately short, sliorter than in A. luca^sanus ; the flabellum is con- 

 siderably f>rolonged and attenuated backwards, much more so than in 

 A. lucasanus ; the gill itself is rather large and twice as wide as in A. 

 lucasanus ; in the female there are no marginal filaments. In the sec- 

 ond pair of feet the endites are slightly longer than in A. lucasatius, 

 especially the first one, and they are more deeply incised or denticulated. 

 The scale (sixth endite) is large and long, reaching to the tip of the 

 5th endite; it is finely spinulose, with a curved terminal spine. The 

 riabellum is large, as is the gill itself, which is nearly twice as broad as 

 in A. lucasanus, and without any marginal filaments. In the tenth pair 

 of appendages the endites are very broad, triangular; the scale longer 

 than the 5th endite, and with a stout terminal spine ; hairy externally 

 and spiny on the inner edge. The flabellum and gill are unusually 

 large. The endites of the eleventh or ovigerous pair are broader than in 

 A. lucasanus. 



The under side of the abdominal segments are a little more spiny than 

 in A. longicaudatus and A. Zitcasmiws owing tothe secondary small spines 

 developed on the base of each segment ; above there is one less spine 

 on each ring than in A. longicaudatus, but the same number as in A. 

 lucasanus. 



The telson is longer than either in A. longicaudatus or A. lucasanus; 

 21 H 



