THE MYSIDS 



67 



of twos and threes, particularly toward the distal end; 

 terminal lobes of the telson armed with a single spine, 

 longer and stouter than any of the spines on the lateral 

 margins. 



Endopod of the uropods (fig. 2b, p. 72) longer than 

 the telson; inner margin armed for at least four -fifths 

 of its length with a closely set row of spines, arranged 

 in groups of three or four smaller spines between much 

 larger spines; there are about seventeen of the larger 

 spines, the distal two of which are much longer and 

 stouter than the others and have no smaller spines be- 

 tween them. 



Exopod of the uropods (fig. 2b, p. 72) a little shorter 

 and broader than the endopod, outer margin armed with 

 about twenty-three spines, gradually increasing in size 

 toward the distal end of the margin and not arranged in 

 groups. 



Length of an adult male, 6 mm. 



REMARKS 



This species is distinguished from A. typlca, Kr,, 

 and A. truncata, Sars, by the produced and pointed ros- 

 tral plate. It differs, also, from A. obtusifrons, Hansen, 

 in having the rostral plate acutely pointed and not ob- 

 tusely rounded. In the character of the rostral plate, it 

 agrees with A. agilis, Sars. A, grossa, Hansen, and A. 

 penlcillata, Zimmer. From the last two species it is 

 distinguished by the form of the second thoracic limb of 

 the male, which is without the blunt process on the inner 

 margin of the fifth joint characteristic of A. grossa and 

 A. penlcillata. It also differs from these two species in 

 the much simpler and more normal exopod of the third 

 pleopod of the male. It is most closely allied toA. agilis, 

 Sars, and differs from it in the slightly different form of 

 the endopod of the second thoracic limb of the male and 

 in the details of the exopod of the third male pleopod. 

 No females occurred in the collection and the male type 

 lacked all the endopods of the third to the eighth thorac- 

 ic limbs. 



The author takes pleasure in associating this species 

 with the name of the Director of the Department of Ter- 

 restrial Magnetism, Carnegie Institution of Washington, 

 under whose auspices the Carnegie set out on her last 

 voyage of exploratory work. 



Subfamily MYSINAE 



Tribe ERYTHROPINI 



Genus EUCHAETOMERA, G. O. Sars 



Euchaetomera glyphidophthalmica, lUig. ? 



E. glyphidophthalmica, lUig, 1906 



E. glyphidophthalmica, Zimmer, 1914 and 1915 



E. glyphidophthalmica, Colosi, 1929 



E. glyphidophthalmica, Illig, 1930 



OCCURRENCE 



Station 28, latitude 13° 10' north, longitude 49° 36' 

 west, 50 m, September 11, 1928, one immature male. 



DISTRIBUTION 



This species is known principally by the records of 

 Zimmer (1914) and Illig (1930) from the tropical parts 



of the Atlantic Ocean. It has been recorded doubtfully 

 from the Mediterranean by Zimmer (1915) and Colosi 

 (1929). The present record does not extend its known 

 geographical range appreciably. 



Euchaetomera plebeja, H. J. Hansen 

 E. plebeja, Hansen, 1912 



OCCURRENCE 



Station 36, latitude 02° 54' north, longitude 80° 02' 

 west, 100 m, October 30, 1928, one adult male. 



Station 66, latitude 27° 04' south, longitude 84° 01' 

 west, 100 m, January 7, 1929, one immature male. 



DISTRIBUTION 



This species has only been recorded once previous- 

 ly, by Hansen (1912) from two stations in the Eastern 

 Pacific. The present records are also from the Eastern 

 Pacific and extend the southern range of the species 

 somewhat, but not beyond the purely tropical regions of 

 these waters. 



Genus EUCHAETOMEROPSIS, Tattersall 



Euchaetomeropsis merolepis (Illig) 



Euchaetomera merolepis, Illig, 1908 

 Euchaetomeropsis merolepis, Tattersall, 1909 

 Euchaetomeropsis merolepis, Zimmer, 1914 

 Euchaetomeropsis merolepis, Colosi, 1929 

 Euchaetomeropsis merolepis, Illig, 1930 



OCCURRENCE 



Station 128, latitude 40° 37' north, longitude 132° 23' 

 west, 100 m, July 25, 1929, one immature male. 



DISTRIBUTION 



This species has been previously recorded from the 

 Gulf of Guinea and four stations in the Indian Ocean (Il- 

 lig, 1908 and 1930), the Mediterranean (Tattersall, 1909 

 and Colosi, 1929), and the South Atlantic (Zimmer, 1914). 

 The present record is the first one from the Pacific 

 Ocean and extends the known geographical range of the 

 species by the full extent of that ocean. 



Tribe LEPTOMYSINI 



Genus DOXOMYSIS, Hansen, 1912 



Doxomysis quadrispinosa (Illig) 



Mysis quadrispinosa, Illig, 1906 

 Mysis quadrispinosa, Tattersall, 1911 

 Doxomysis pelaglca, Hansen, 1912 

 Doxomysis tattersalll, Colosi, 1920 

 Doxomysis quadrispinosa, Illig, 1930 



OCCURRENCE 



Station 38, latitude 03° 46' north, longitude 81' 

 west, 50 m, November 3, 1928, one adult male. 



37' 



