254 T'ransactions.—Zp oology. 
owing to the transparency of the shell the mucus-gland (testis ?) could 
easily be seen. 
Fam. II. Cytheride. : 
Superior antenne five- to seven-jointed, armed with sete or spines; 
inferior antenne four- to five-jointed, without a brush of sete. Three pairs 
of feet, all very much alike, adapted for walking. Post-abdomen rudimen- 
tary, consisting of two very small lobes. 
Genus I. Cythere, Müller. 
Shell usually thick and strong, with a more or less rough and uneven 
surface. Superior antenne five- to six-jointed, spiniferous ; inferior antenna 
four-jointed. Mandibular palpus three- to four-jointed, and furnished with 
a tuft of from two to five sete. Internal lobe of first maxille well developed. 
1. Cythere atra, nov. sp. Figs. A.2 and C.1. 
Valves subreniform, highest behind the middle, narrowing anteriorly, 
rounded posteriorly; when viewed from above, narrow-oblong, evenly 
convex, tapering to a subacute apex anteriorly, more obtuse posteriorly. 
Examined under a high power, the shell is seen to be sparsely covered with 
circular translucent spots, which appear black when the animal is within. 
Margin fringed with very short close cilia. Colour nearly black, opaque, 
except near the margins. Limbs yellowish. Superior antenne 6-jointed, 
last joint small, three preceding subequal in length, sete short; second 
joint fringed with minute hairs on lower margin. Inferior antenne stout, 
with the last joint very short; terminal claws short and uneven ; urticating 
seta bi-articulate, reaching to the extremity of the antenna. Limbs similar 
in shape, lengthening posteriorly. Length jj inch; height 4, inch. 
Among Alge in shallow water. Otago Harbour. 
2. Cythere truncata, nov. sp. Fig. 0.2 a—c. 
Valves sub-quadrilateral, highest in front, lower margin slightly hol- 
lowed in the middle, anterior extremity very wide and rounded, middle of 
upper margin falling slightly away ; posterior extremity with its upper half 
hollowed out into a deep oblique notch. When viewed from above, the 
valves are elongate-quadrilateral in outline, obtuse in front, sides nearly 
straight, and about even in width to the posterior angle, where they sud- 
denly fall away to the margin. Whole anterior margin fringed with broad, 
curved, and flat teeth, the rest all smooth. Surface irregularly pitted and 
grooved, marked with cireular dots. Greatest height barely equal to half 
the length. The limbs of the animal are brownish-yellow in colour. Last 
joint of upper antenrz only half as long as preceding; terminal sete stout. 
Urtieating seta of lower antenna short, only reaching to middle of third 
joint, uniarticulate. Mandibular palp bearing three curved and pectinately 
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