224 THE SCHIZOPODA. 



Distribution. — lUig's type was taken in the tropical Atlantic, in the Ben- 

 guela current off Angra Pequena, in a vertical haul from 4000 m. to surface. 

 The Monaco specimens were captured at Lat. 27° 43' N., long. 18° 28' W., 3000 

 to m., and the depth of the Station was 3817 m. — This gigantic species is 

 certainly bathypelagic. 



(?) Thysanopoda cornuta Illig. Juv. 

 Plate G, figs, la-le. 

 Sta. 4679. Dec. 7, 1904. Lat. 17° 26.4' S., long. 86° 46.5' W. 300 fms. to surface. 1 specimen. 



The specimen measures 14.5 mm. in length. The thoracic legs, which are 

 well developed, shows that it belongs to the genus Thysanopoda; the shape or 

 rather the stage of development of the maxillulae (fig. Ic) and the maxillae 

 (fig. Id) together with the fact that the uropods are very short in comparison 

 with the telson (fig. le) proves with absolute certainty that the specimen is very 

 young. The sixth abdominal segment is shorter than the fifth, which shows 

 that the specimen belong to Group b of this genus. And with little doubt 

 I consider it to be a specimen of T. cornuta near the end of its larval life. 



Description. — The frontal plate is very large (fig. la) with a considerable 

 portion of the lateral margin, subparallel, the distal outer angles rounded, the 

 front margin very long, in the main transverse, being a little produced at the 

 middle as a small very low triangle and the part of the margin outside this 

 triangle distinctly concave. The median keel between the cer\'ical groove and 

 the front end is well developed. The integument of the carapace is somewhat 

 thin, but the cervical groove and the lateral grooves connected with it seem to 

 agree with my figures of the adult, while the longitudinal lateral furrows cannot 

 be discerned; the lateral margins seem to have no real denticle. 



The eyes are of moderate size, nearly black; the small process found in 

 the adul t on the outer distal angle of the eye-stalks has not yet been developed. — 

 The antennulae (fig. lb) show considerable similarity with those in the adult, 

 but the basal joint is still without its upper distal lobe, and the process fromtlie 

 outer distal angle is long, as might be expected. — The antennal squama with a 

 distinct tooth from the outer distal angle. — The maxillulae (fig. Ic) show larval 

 characters ; the small exopod (ex) is present, while a vestige of a pseudexopod is 

 rudimentary; the palp (4) has certainly not yet obtained its final length and 

 only very few of its setae. — The maxillae (fig. Id) show the aspect as in older 

 larvae. 



