186 THE SCHIZOPODA. 



result that it is identical with G. gracilis Will.-Suhm, as already pointed out by 

 Ortmann. 



Ortmann's elaborate account of this characteristic species is very good; 

 my own examination of the types corroborates his statements and critical 

 remarks. The study of the five specimens from the Agassiz collection and the 

 two types mentioned shows that the lamellar crest is well developed both in 

 full-grown and a little more than half-grown specimens, but rudimentary in a 

 much smaller specimen, while the expansion of the lateral plates of the five 

 abdominal segments is well developed only in full-grown specimens and feebly 

 developed in specimens measuring 37-41 mm. in length. It may be added that 

 the anterior dorsal sj^iniform process on first abdominal segment is always 

 much smaller than the posterior, but proportionately considerably longer in 

 large than in small specimens. The character pointed out by Ortmann that 

 "there are two triangular, pointed epimeral lappets on each side of the anterior 

 part of the sixth segment ' ' is very interesting. 



Distribution. — According to the literature this species has a wide distribu- 

 tion :— Atlantic at Lat. 1° 22' N., long. 26° 3G' W., Bay of Bengal, off Galapagos, 

 ofif Panama, and off Central California. It is a bathypelagic species, taken in 

 depths from more than 600 to more than 2000 fathoms to surface, the only 

 exception being the small, not half grown specimen from Sta. 4652 taken in 400 

 fathoms to surface. 



4. Gnathophausia zoea Willemoes-Suhm. 



1875. Gnathophausia zoeo Willemoes-Suhm, Trans. Linn. Soc. London, ser. 2, 1, p. 32, pi. 9, figs. 2-15; 



pi. 10, fig. 4. 



1885. Gnathophausia zoea G. O. Sars, Challenger Rept., 13, p. 44, pi. 6, figs. 6-10. 



Gnathophausia willemnesii G. O. Sars, Challenger Rept., 13, p. 38, pi. 5, figs. 1-6. 



1S91. Gnathophausia sarsi Wood-Mason and Alcock, Ann. ISIag. Nat. Hist., ser. 6, 7, p. 187. 



1906. Gnathophausia zoea Ortmann, Proc. U. S. Nat. Mus., 21, p. 42. 



1908. Gnathophausia zoea H. J. Hansen, The Danish Ingolf-Exp., 3, 2, p. 93, pi. 4, figs. 3a-3c. 



1910. Gnathophausia zoea H. J. Hansen, Siboga-Exp., 37, p. 17. 



Sta. 4641. Nov. 7, 1904. Lat. 1° 34.4' S., long. 89° 30.2' W. 633 fms., trawl. 1 specimen. 



Remarks. — As to variation, size, etc., of this species I refer to Ortmann's 

 paper and to the remarks in my two recent treatises. The specimen from the 

 Agassiz Expedition is about half grown and shows nothing of interest. 



Distribution. — This species is common in the tropical and northern tem- 

 perate Atlantic, where it is found northwards even to West of Iceland : Lat. 64° 

 45' N., long. 29° 06' W. (Ingolf-Exp.); it has been taken in the Bay of Bengal, 

 in the Indian Archipelago, and is widely distributed in the tropical and northern 

 temperate Pacific. Detailed statements on the geographical and bathymetrical 

 occurrence are found in Ortmann's paper and in my two recent reports. 



