20 BULLETIN 2 01, UNITED STATES NATIONAL MUSEUM 



from the Sea of Okhotsk was examined and identified as L. typicus 

 by Ortmann (1906). I believe it should be referred here. 



Distribution. — Seas around Japan, 48 to 139 fathoms. 



Remarks. — This species may be distinguished by the combination 

 of characters afforded by the coarse tuberculation of the carapace, 

 the scale of the "elongate" type with few teeth on the outer margin, 

 and the form of the rostral plate. I think it is almost certain that 

 the specimens recorded by Ortmann from Japan should be referred 

 to this new species. The characters of the rostrum, scale, and telson 

 given by Ortmann agree exactly with the above definition. The 

 species is closely allied to L. intermedins Hansen. 



LOPHOGASTER INTERMEDIUS Hansen 7 



Figure 1, c 



Lophogaster intermedins Hansen, 1910, p. 14, pi. 1, figs. 1, c-1, e. — Tatteesall, 

 1922, p. 448. 



Occurrence. — Japan : Albatross station 4944, 1 female with embryos 

 in the brood pouch, 20 mm. 



Distribution. — Waters of the Dutch East Indies, 75 to 141 meters; 

 Mergui Archipelago, 62 fathoms. 



Remarks. — This specimen differs from the specimens of L. japonicus 

 in having the tubercles of the carapace altogether much finer and more 

 regular in size, and in this respect it appears to agree with L. inter- 

 medins, in which the carapace is described as "finely granulated." The 

 rostrum agrees exactly with that of L. intermedius. The antenna! 

 scale (fig. 1, c) is about twice as long as broad and thus is rather 

 broader than in L. intermedius, and it has two teeth on the left side 

 and three teeth on the right side, in addition to the long terminal 

 spine. The telson has four spines on the lateral margins including 

 the apical spines, and between the latter are six spinules. I refer this 

 specimen with some doubt to L. intermedius. It may be merely a 

 variety of L. japonicus. 



LOPHOGASTER sp.? 



Figure 1, d 



Occurrence. — Albatross station 4891, 1 male, 20 mm. 



Remarks. — I cannot fit this specimen into any known species of the 

 genus. The carapace has no tubercles or granules, but these are 

 replaced by rather scattered microscopic spinules. The rostral plate 

 has the central spine equal in length to the lateral spines and extend- 

 ing only about halfway up the last joint of the antennular peduncle. 

 The antennal scale (fig. 1, d) is of the "rotundate" type, about iy 2 

 times as long as broad, with the terminal spine somewhat curved, 



