182 THE SCHIZOPODA. 



name Chalaraspis I follow Sars (Challenger Rept., p. 51). Willemoes-Suhm 

 left two figures of a species to which he had given the name Chalaraspis alata. 

 The only specimen obtained by the "Challenger" had been lost, and therefore 

 Sars described the genus and the species from the drawings made by Suhm. 

 The drawings have been rendered as woodcuts by Sars; they were evidently 

 somewhat imperfect or inaccurate in several particulars. The figures show the 

 animal as having the carapace exceedingly large, covering the two anterior 

 abdominal segments and the lateral part of third segment. Among the ' ' Alba- 

 tross" material I found specimens agreeing tolerably with Suhm's figures in 

 all main features excepting the relative length of the carapace, but as specimens 

 of allied genera, Gnathophausia and Eucopia, sometimes are contracted to such 

 a degree that the carapace covers two segments of the abdomen, no stress can 

 be laid on the apparently very long carapace shown by Suhm's drawings, as 

 his specimen in all probability has been very much contracted. And Sars's 

 diagnosis of the genus agrees, so far as it goes, in the main with the description 

 founded on my specimens. 



1. Chalaraspis alata Willemoes-Suhm, MS. G. O. Sars. 

 Plate 1, figs, la-ll. 



1885. Chalaraspis alata G. O. Sars, Challenger Rept., 13, p. 51. (Two text-figures). 



Sta.4665. Nov. 17, 1904. Lat. 11° 45' S., long. 86° 5.2' W. 300 fms. to surface. 1 very young 



specimen. 

 Sta. 4672. Nov. 21, 1904. Lat. 13° 11.6' S., long. 78° 18.3' W. Top of Tanner net, 400 fms. to surface. 



2 immature specimens (bad). 

 Sta. 4675. Nov. 22, 1904. Lat. 12° 54' S., long. 78° 33' W. 300 fms. to surface. 1 immature specimen. 

 Sta. 4719. Jan. 14, 1905. Lat. 6° 29.8' S., long. 101° 16.8' W. 300 fms. to surface. 1 male. 



Description. — General aspect somewhat similar to that of Lophogaster. — 

 The frontal plate somewhat short but very broad, with the anterior transverse 

 margin straight or even slightly emarginate and the lateral angles broadly 

 rounded (figs, la-lb). The carapace has the cervical groove not only deep 

 but very curiously shaped; seen from the side (fig. lb) the groove seems to be 

 formed by two transverse furrows which unite laterally, while the anterior 

 furrow is again dorsally bifid; on the side the furrow is bent and is far from 

 reaching the lower margin of the carapace. A little more than the anterior 

 fourth of the lateral margin of the carapace is hollowed in a peculiar way, and 

 somewhat above the whole lateral margin a furrow runs from near the front 

 to the hind margin. Between the antero-lateral rounded angles of the frontal 

 plate and the cervical groove a pair of feeble longitudinal keels are seen (fig. la), 

 and the area between these keels is feebly concave ; a branchial groove is feebly 

 developed, and rarely the posterior third of the carapace has the middle line 



