A REVIEW OF THE MYSIDACEA 19 



coating of microscopic spinules, and by the slightly narrower anten- 

 nal scale. The specimens from the Carolinas, the Gulf of Mexico, 

 and Key West, described by Ortmann (1906), agree very closely 

 with the above description as regards the rostrum, the teeth on the 

 antennal scale, and the spines on the telson, but Ortmann gives no 

 indication of the nature of the ornamentation on the carapace. I be- 

 lieve they belong to this new species. Ortmann's notes on the varia- 

 tions met with in this species are valuable; in the two specimens I 

 have examined the antennal scales are asymmetrical, having six teeth 

 on one side and seven on the other. 



The specimen from Fish Hawk station 870 is the one about which 

 Smith (1881) wrote: "A species very distinct from L. typicus, Sars." 

 The same specimen was also referred to by Verrill (1885, p. 558). 



Both Smith (1884) and Verrill (1885) refer to Lophogaster sp. 

 with a bathymetric range from 1,022 to 2,949 fathoms captured dur- 

 ing the cruise of the Albatross in 1883. There are no specimens in this 

 collection from the Albatross stations of 1883, and I do not know to 

 what species Smith and Verrill refer unless it is to eucopia, which 

 occurred at stations 2094 and 2099, with depths of 1,022 and 2,949 

 fathoms, respectively. The small specimen that I perhaps rather 

 hastily called L. typicus and recorded from the western Atlantic in 

 1926 should in all probability be referred to this new species. 



LOPHOGASTER JAPONICUS, new species 



Figubes 1, 6; 2, a 



Lophogaster typicus (pars) Ortmann, 1906, p. 23 (Japanese specimens). 



Description. — Carapace (fig. 2, a) coarsely tuberculate especially 

 anteriorly in front of the cervical sulcus and at the sides, quite as 

 tuberculate as L. typicus; rostral plate with the median process longer 

 than the lateral and extending forward slightly beyond the distal 

 end of the antennular peduncle but not to the extremity of the an- 

 tennal scale; posterolateral angle of the carapace produced into a 

 short spine; antennal scale (fig. 1, b) of the "elongate" type, about 

 twice as long as broad, with the terminal spine long and straight, 

 with 2 or 3 teeth on the outer margin in addition to the terminal spine ; 

 telson with 4 spines on the lateral margins including the spines at 

 the apex and with 6 to 8 spinules between the long terminal spines. 



Cotypes. — Two males, U.S.N.M. No. 81253; Albatross station 4815, 

 Japan, latitude 38°16' K, longitude 138°52' E. 



Occurrence. — Japan: Albatross stations 4815, 2 males, 28 mm., 

 types ; 4816, 1 male, 29 mm. ; 4817, 1 female with young in the brood 

 pouch, 25 mm.; 4903, 1 male, 30 mm. Sea of Okhostsk: Albatross 

 stations 3707*, 3714*, 3715*, 3717*, 3718*, 3740*. All the material 



