66 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



Figure la may, for the rest, convey a fair idea of the furrows and 

 ridges of the carapace. 



Distribution. — Three localities are mentioned in the literature. 

 The species has been taken twice in the East Atlantic, that is, in its 

 tropical area by the German Deep-Sea Expedition and in the sub- 

 tropical northern part by the Prince of Monaco; finally it was 

 secured by Dr. A. Agassiz in the tropical East Pacific. 



(?) THYSANOPODA CORNTJTA Illig. (Young). 



Under this name I described and figured in the Harvard paper 1 

 an animal near the end of the larval life and measuring 14.5 mm. in 

 length. The Albatross has gathered a specimen at the following 

 station in the Pacific: 



Sta. 4759. May 20, 1906. Lat. 53° 05' N.; long. 138° 31' W. 

 300-0 fathoms. 1 specimen. 



This specimen, which also is 14.5 mm. long, differs from that 

 figured in 1912 in having a fine, slender rostrum which is about one- 

 third as long as the front margin of the frontal plate; furthermore, 

 the median anterior keel on the carapace is feebly developed, the 

 furrows and keels on the carapace and on the posterior abdominal 

 segments are feeble or not discernible, the endopods are still dis- 

 tinctly shorter in proportion to the telson and their exopod con- 

 siderably shorter than the endopod; finally, the thoracic legs are 

 much less developed than in my former specimen. All these fea- 

 tures show that the new specimen, though as long as that described 

 in 1912 and agreeing with it as to the shape of the frontal plate, in 

 general aspect, etc., is somewhat less developed, possessing decidedly 

 more larval features. It may be added that its antennular flagella 

 are similar in length, scarcely half as long as the carapace and some- 

 what shorter than the antennal flagella. 



Genus MEGANYCTIPHANES Holt and Tattersall. 

 Only a single species is known. 



8. MEGANYCTIPHANES NORVEGICA M. Sars (1856). 



1886. Nyctiphanes norvegica Koelbel, Die cesterr. Polarst. Jan Mayen, p. 48, pi. 



3, figs. 7-10. 

 1905. Meganyctiphanes norvegica Holt and Tattersall, Rep. Sea and Inland 



Fisheries of Ireland, 1902-1903, pt. 2, No. 4, pp. 105 and 135, pi. 16. 



Other ref ere aces to literature are found in K. Stephensen's Gr0n- 

 lands Krebsdyr og Pycnogonider. 2 It may be added that I pointed 

 out in the Siboga Report (p. 90) that Euphausia lanei Holt and Tat- 

 tersall (1905) had been established on a less than half -grown and 

 besides somewhat damaged specimen of M. norvegica. 



Occurrence. — It has been captured at a very large number of 

 places in the northwestern area of the Atlantic: 



i P. 224, pi. 6, figs, la-le. 3 Meddelelser om Grjfoland, vol. 22, 1913. 



