190 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Family ONCiEIDiE. 
ONCiEA Philippi. 
Form of body like that of Cyclops; cephalothorax and abdomen of female each with 5 segments 
(head distinct from first thoracic, first from second abdominal). Mandibles not hatchet-shaped, with 
movable, pectinate and bristle-shaped appendages. The maxillae are 1-jointed lamellae. Feet with 
long, slender third joint of inner ramus, that of fourth pair at least 1^ times as long as first and 
second joints of inner ramus taken together ; fifth foot a small rod or knob. Mouth parts of male 
similar to those of female. 
Female: Anterior antennae »6-jointed, with long middle joint; aesthetasks poorly developed. 
Posterior antennae 3-jointed, with uncinate bristles of medium length. Appendages of anterior 
maxillipeds in part pectinated with plumes. Posterior maxilliped 4-jointed, on inner border of second 
basal with rows of points. Outer ramus of first and second pairs of legs with 1, 1, 3, of third and 
fourth pairs with 1, 1, 2 usually denticu- 
lated outer marginal bristles. Inner 
ramus of first pair with 1, 1, 6, in second 
pair with 1, 2, 6 (5), in third pair with 
1, 2, 5 (4), in the fourth pair with 1, 2, 4 
(3) usually bristle-shaped appendages. 
Male: Abdomen with 5 segments, 
with abbreviated middle segments ; geni- 
tal segment voluminous; genital valves 
with a lateral point. Posterior maxilliped 
with more movable insertion than in the 
female, with more muscular second basal 
joint and more strongly curved terminal 
hooks; the 3 short terminal joints of ante- 
rior antennae fused to form a single piece; 
other minor sexual peculiarities. 
27. Oncaea venusta Philippi. 
Female: Cephalothorax p y r i f o r m 
(head broad), usually with granulated 
cuticle; genital segment but little longer 27. Onccea venusta Philippi; a. female, dorsal aspect; 6, male, dorsal 
than remainder of abdomen, succeeding aspect; c, female, posterior antenna; d, female, fourth loot, 
segments broader than long ; furca at least 
as long as fourth and fifth abdominal segments together, and at least 4 times as long as broad. Posterior 
antennas, especially their inner rami, very short. Terminal hook of posterior maxillipeds with a few 
points on the concave surface ; the 2 bristles on second basal joint rather long and slender. Outer 
ramus of feet with broad-margined, serrated outer marginal bristles; third joint of inner ramus of 
fourth pair without terminal pegs, with three lancet-shaped serrated bristles in second and fourth 
pairs. 
Male: Short genital valves and short, b’road anal segment. 
Coloration : Rather opaque with carmine-red pigment, accumulated largely in the cephalothorax 
and genital segment, chitin of cephalothorax and appendages more or less violet; eggs blue. 
Length of female, 1.1 to 1.27 mm ; of male, 0.8 to 0.95 mm. 
A few specimens of both sexes collected in the Gulf Stream tow, about 60 miles south of Marthas 
Vineyard, July 28, 1899, late in the afternoon. 
Family CORYCiEIDiE. 
SAPPHIRINA I. V. Thompson. 
Body flattened dorso-ventrally ; thorax and abdomen of female each with 5 segments (head 
separated from first thoracic, first from second abdominal), with broadened middle abdominal 
segments; furca leaf-shaped, each limb with 5 bristles. Mandibles hatchet-shaped, their dorsal tip 
drawn out into a point. Maxillae oval lamellae. Rami of feet 3-jointed of varying relative size; fifth 
