190 
SOME 
PCECILOPODA. 
Bactjltjs, n. g. 
Bacitlus elongatus, n. s. Cephalothorax 4-articulatus, segmento antico maximo, 
sequentibus brevibus, subaequis. Oculi duo, parvi. Antennas quatuor, posticis pre- 
hensilibus. 
biremes. 
Truncus buccalis magnus. 
Maxillipedes fortes. Pedes natatorii octo, 
Abdomen 1-articulatum, elongatum. 
Tbe interesting specimen above described is quite unlike any otber with which we are yet 
quainted ; but as it bears no eggs, it is impossible to ascertain what is its sex, or whether 
little-known species; hut 
a new 
It is 
it is yet mature. If not, it may be a young state of 
unless this is the case, it must, I think, be considered as the type not only of 
genus, but also of a new family. In general form it resembles a constable's staff 
thickest near the front end, and gradually tapers to the other extremity 
The cephalotl 
four-jointed ; the first segment occupies more than two-fifths of 
the whole length. The three following segments are small, and rounded at the sides. The 
eyes are two in number, small, and seated on a mass of pigment. The anterior antennas 
are short, three- or four-jointed, and clothed with rather long hairs on the front end. The 
posterior antennae are shorter and stouter 
prehensile character. 
They end in a large claw, which gives them 
Immediately behind the large suctorial mouth is a pair of jaws, the homologies of 
which I have not been able to determine. 
The natatory feet are e 
le segment 
are eight in number. The abdomen appears to consist of only a 
ringed at the sides, and ends abruptly. At the posterior extremity 
e two small, slightly projecting disks. 
This remarkable species belongs apparently to the Ergasiloidea, and at first sight some- 
what resembles Monstrilla. Prom this genus, however, it differs altogether in the for 
of the abdomen, and in the presence of posterior antennas — a character which might see 
to indicate a greater affinity with Ergasilus. 
Length -rnth of an inch. 
Caught April 9, in S. lat. 0° 3C/, W. long. 0° 30'. 
Pl. XXIX. fig. 40, x 30. 
