CYCLOPOIDEA. 



Catopia FURCATA. 



1173 



Gracilis. Caput quadratum, non discretion. Ceplialothorax i-articu- 

 latus, posticd l-sjnni-dentatus, dentibus externis longioribus. An- 

 tennas anticce corpore longiores, duplo curvatce, multi-articulatce, graciles, 

 medio parce incrassatm, apicibus fronte non anterioribus : setis totis 

 brevibus, anticd apicali et posticd penultimd articxdo non longioribus, 

 anticd penultimd et antepenultimis valde brevioribus. Antennas pos- 

 ticce parvulce. Abdomen 5-articulatum. Styli caudales elongati, 

 dimidio abdominis longiores, divaricati, setis incequis. 



Slender. Head quadrate, not separate. Cephalothorax four-jointed, 

 posterior extremity with four spinous processes, the two inner 

 smaller than the outer. Anterior antennae longer than the body, 

 doubly curved, tips in the line of the front, many-jointed, slender, 

 at the middle sparingly incrassate; setae all short, the anterior 

 apical and posterior penult as long as the joint of each, the anterior 

 penult and the antepenult much shorter. Posterior antennae quite 

 small. Abdomen five-jointed. Caudal stylets slender, more than 

 half the length of the abdomen, divergent; setae unequal. 



Plate 79, fig. la, animal, enlarged; a', side view of head, more 

 enlarged ; b, extremity of left antenna ; c, enlarged view of genicu- 

 lating articulation in right antenna; d, base of antenna, showing 

 short stout spines. 



Straits of Banca, March 2, 1842. 



Length, one-sixteenth of an inch. Colourless, or nearly so. 



The view of the head in fig. 1 a, shows the spherical lens under an 

 exterior hemispherical cornea, and connected within with a mass of 

 pigment. A filament, supposed to be nervous, connects with a mass 

 just behind; while another, apparently muscular, extends upward, 

 although lax, and is attached to the shell. The lens was observed to 

 be in constant vibration beneath the cornea. The beak is very short. 



The geniculating joint of the right antenna is situated just anterior 

 to the last five joints; the first and second of the five, however, are 



294 



