Ce ee OS ee ea any 
A. E. Verrill on new American Phyllopod Crustacea. 253 
This species appears very early in spring, often in great 
numbers, in quiet pools. I have never seen it later than the 
middle of May, yet since the individuals seen in early spring 
are full-grown, it might, doubtless, be found also in autumn. 
Branchipus (Branchinecta) arcticus Verrill, sp. nov. 
Branchipus paludosus Packard, Invertebrate Fauna of Labrador, in Mem. Bos- 
ton Soc. Natural History, i, p. 295, (non Miiller). 
Form slender, body short, abdomen elongated. A full sized 
male is 20™ (-80 of an inch) long, exclusive of the claspers, 
the abdomen being 13™"; the breadth between the eyes 3™. 
female 20"™ long, with the abdomen 12™", has an egg-pouch 
6‘2long. Branchial “feet” slender, elongated, the middle ones 
longest, 4 to 5™™ long when extended. Claspers of the male 
rather long and slender ; the basal joint is but little swollen, 
elongated, regularly curved, with a small tooth or prominent 
angle at the articulation on the inside, and on the inner side a 
row of numerous small, distinct, sharp teeth, extending from the 
articulation about half way to the base, and arranged somewhat 
obliquely ; second joint slender, regularly curved, tapering to a 
blunt point, the inner edge minutely serrulate. Front simply 
curved, with no appendages. Antenne slender, scarcely more 
than half the length of the basal joint of the claspers. La- 
brum long and narrow, mandibles stout, strongly curved, bluntly 
pointed. Caudal appendages slender lanceolate, rather small, 
th long slender setae. Egg-pouch much elongated, slender, 
subcylindrical, beaked or slightly bilobed at the end, the upper 
or dorsal lobe longest, its basal portion with two small rounded 
lateral lobes. 
large male gives the following measurements: breadth be- 
tween outer extremity of eyes 3°46" ; diameter of eyes ‘66 ; 
length of basal joint of claspers 1°66 ; breadth aks length of 
second joint 129; breadth at its base ‘46; width of mandibles 
at middle -66 ; length of caudal appendages “96; breadth at 
base -16 ; length of longest sete ‘84 to1™™ 
. Color of preserved specimens pale reddish, with dark green 
intestine. Labrador, at “Indian Tickle” on the north shore o 
Invuctoke Inlet, abundant in a pool of fresh water,—Dr. A. 8. 
Packard. 
slender tips, which are nearly straight. The tooth on the in- 
