ae ae PHYLLOPODS OF NORTH AMERICA. 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 adult, 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 NEWBERRYI Packard. 
Plates XVI, fig. 3, 3a, 3b; XVIII, figs. 2,7; XIX, fig. 3; XX, fig. 1. 
Apus newberryt Pack., Amer. Journ. Se. Aug. 1871. 
Carapace rather longer than in A. longicaudatus and lucasanus, tough 
leaving about the same number of appendages 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 where it is much 
produced posteriorly. 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 pair 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, shorter than in A. lucasanus ; the flabellum is con- 
siderably prolonged 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. lucasanus, 
especially the first one, and they are more deeply incised or denticulated. 
The seale (sixth endite) is large and long, reaching to the tip of the 
5th endite; it is finely spinulose, with a curved terminal spine. The 
tlabellum 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, dnd 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. lucasanus 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 
