28 DISCOVERY REPORTS 



margins which cover the eyes may be more or less serrated and there may be scattered spinules on the 



carapace behind and below the eyes. 



The eyes are much reduced and very long, extending laterally at right angles to the main axis of 

 the body, with the distal half of the cornea extending beyond the lateral margins of the rostral plate. 

 There is a small, curved, finger-like ocular papilla on the inner distal margin of the eyestalk. 



The uropods are relatively longer than in Lophogaster and the outer margin of the exopod is armed 

 with two or three small spines in addition to the terminal one. 



Only one species, Chalaraspidum alatum, has been recorded up to the present, but Zimmer (1914, 

 p. 383) obtained a specimen from near the Azores which undoubtedly belongs to the genus. Owing 

 to its damaged condition, Zimmer did not feel justified in founding a new species for it, but the form 

 of the antennal scale which he figured and the shape of the telson indicate that in all probability it is 

 a new species of Chalaraspidum. 



Chalaraspidum alatum (W.-Suhm) in MS. 1874 

 (Fig. 1 A-E) 



1874 Chalaraspis alata W.-Suhm, p. 592. 



18856 Chalaraspis alata, G. O. Sars, p. 51, figs. 



1895 Chalaraspidum alatum W.-Suhm (in Murray, 1895, p. 521 from MS. dated March, 1874). 



1895 Eclytaspis alata, Faxon, p. 219. 



1 91 2 Chalaraspis alata, Hansen, p. 182, figs. 



1939 Chalaraspis alata, Fage, p. 68, figs. 



1 941 Chalaraspis alata, Fage, p. 4, figs. 



195 1 Chalaraspidum alatum, W. M. Tattersall, p. 14. 



Occurrence : 



St. 101. 14/15. x. 26 (night). West of Cape Town, 2580-2480 m., 1 imm. $, 28 mm., with very small oostegites. 

 St. 253. 21. vi. 27 (day). About 1000 miles west of Cape Peninsula, 1050-1000 m., 1 adult $, 38 mm. 



Remarks. Owing to the softness of the integument and to the great depths at which specimens have 

 been taken, there are no records of a perfect example of this interesting species. The type had 

 unfortunately been lost by the time Sars wrote his report on the Challenger Schizopods and his 

 description of the species was compiled from the notes and letters written by Dr Willemoes-Suhm 

 some eleven years earlier. The figures Sars gave were faithful copies of manuscript sketches made 

 by W.-Suhm. Since its original discovery a few records of the species have been made from widely 

 separated localities in the Pacific, and details of the morphology have been added. In some respects 

 these later descriptions do not agree with that given by W.-Suhm and some suggestion has arisen that 

 there may be more than one species involved. 



The description of the rostral plate of the type is as follows : 'Anteriorly, it (the carapace) projects as 

 a short, but very broad, frontal plate, abruptly truncate at the extremity, the anterior margin being 

 slightly emarginate and finely serrate, the lateral corners somewhat extended.' Hansen (1912, p. 182), 

 recording several immature specimens from the eastern Pacific off Peru, stated that the antero- 

 lateral corners of the rostral plate were broadly rounded. He made no mention of any serrulations 

 along the anterior or lateral margins and, if they were present, it is most unlikely that so meticulous 

 a worker would have overlooked them. Fage (1939, p. 68), recording specimens from the China Sea 

 and from the Gulf of Panama, stated that the antero-lateral angles were rounded and very finely 

 serrulated. Both authors recorded that the outer margin of the antennal scale was armed with 

 9-12 teeth in addition to the distal terminal tooth. 



Tattersall (1951) recorded three specimens captured in the Pacific by the 'Albatross'. He stated 

 that one of these, taken in the East Pacific off the coast of California, agreed very closely with the 



