264 Transactions.— Zoology. 
sete. Telson slightly concave above, narrowing towards the end, near 
which are two very small sete on each side. Colour, whitish, semi- 
transparent. Length 44 inch. 
Hab. Lyttelton Harbour. Three specimens taken in company with 
numerous specimens of P. debilis. 
Genus Bircenna, novum. 
Body broad, coxe very shallow. Antenne sub-equal, upper without a 
secondary appendage.  Mandibles without an appendage.  Maxillipedes 
with well-developed plates on both basos and ischios. Gnathopoda equal, 
not subchelate. Last segment of pleon and its appendages rudimentary. 
Telson simple, not divided. 
Bircenna fulvus, sp. nov. Pl. xxi., fig. 1, a to e. 
Head broad, depressed in front, antenne short, not longer than the head; 
both pairs of same length, slender. Peduncle of upper not distinguishable 
from the flagellum, first joint about as long as the second, but stouter, third 
shorter than the second, flagellum of about six joints, each bearing some 
simple auditory cilia. Peduncle of lower antennw with four joints distin- 
guishable, the last as long as the two preceding, flagellum of about four 
joints. Both antenne with a few small sete.  Maxillipedes short, the 
plates on the basos and ischios reaching to the same point and nearly to 
the end of the maxillipede itself. Gnathopoda equal and similar, ischios as 
long as meros which is rounded at the ond, carpus slightly longer than the 
meros, expanded slightly distally, propodos slightly longer than the carpus, 
of same width throughout, produced very slightly at its infero-distal angle, 
a few small sete on inferior margin, dactylos stout, with a tooth on inner 
margin, not bent back upon the propodos. 
First and second pereiopoda short, meros produced at antero-distal 
angle. Three last pairs of pereiopoda increasing in size posteriorly, basos 
of each much expanded. Coxe very shallow, broader than deep. Fourth 
pleopoda with rami both longer than peduncle, acutely pointed, curving 
upwards, one nearly twice as long as the other, fifth similar but stouter, 
fifth segment of pleon very short, sixth apparently absent, sixth pleopoda 
represented by a single joint bifid at end, outer piece rounded, inner ending 
in a sharp point and bearing on inner margin four or five longish setee. 
Telson short, triangular, with a seta on each side near the end. Length 
i inch. Colour, yellow. 
Hab, Lyttelton Harbour. 
Ido not know where to place this peculiar-looking little Amphipod ; it 
may come near to Phlias, but the species of that genius given in the 
Catalogue of the Amphipoda in the British Museum are not described in 
sufficient detail to warrant one in forming any definite conclusion as to 
their relationship. I have only a very few specimens. 
