PROCEEDINGS OF THE NATIONAL MUSEUM 

 Daia to accompany cited Bache Stations, 1914 ■ — Continued 



Order ¥1YSIDACEA 



Suborder LOPHOGASTRIDA 



Family LOPHOGASTRIDAE 



Genus LOPHOGASTER M. Sars 



1. LOPHOGASTEK TYPICUS M. Sars 

 Lophogaster typicus Ortmann, 190G. 



Occurrence. — Station 10209, 100-0 m., 1 specimen, immature, 7 

 mm. long. 



RemarJcs. — Traces of the pectinations on the rostral plate, charac- 

 teristic of the pelagic post-larval stages of this species, still remain 

 on this specimen. The rostral plate forms a complete hood over the 

 eyes as in the Cal3^ptopis stages of the Euphausiacea. The median 

 spine is longer than the laterals and slightly longer than the antennular 

 peduncle. The antennal scale has live teeth, including the terminal 

 tooth, on the outer margin. The telson has three spines on the lat- 

 eral margin in addition to the two large spines on each side of the 

 apex, and there are eight teeth on the pectinate apex of the telson. 

 The sternal armature of the abdomen, one very prominent median 

 forwardly directed sharp spine to each segment, is well developed. 

 The postero-lateral free corners of the pleura of the fourth and fifth 

 abdominal somites are acute but scarcely produced. Those of the 

 sixth somite, as well as those marking the apparent division of this 

 somite into two parts, are more produced than those of the fourth 

 and fifth somites but nothing like to the same degree as in L. spinosus. 

 Ortmann (1906), in describing the latter species, writes that it differs 



