EUPHAUSIA DISTINGUENDA. 287 
And after a renewed examination of the ‘‘Siboga”’ material I consider my inter- 
pretation or reference of these animals as quite certain. The above-described 
larvae must therefore belong to a species allied to T. monacantha (T. agassizit) 
‘and according to my knowledge of young animals of 7’. pectinata, T. orientalis, 
T. aequalis, and T. obtusifrons they cannot belong to any of these forms, but 
most probably to 7. cristata G. O. 8., which is larger than T. monacantha and 
agrees with it in having a lateral furrow somewhat above the lower margin of 
the carapace. 
Euphausia distinguenda H. J. Hansen. 
Plate 12, figs. 2a—2e. 
Last Furcilia-Stage-— Slender.— The frontal plate (fig. 2b) is large, scarcely 
twice as broad as long, anteriorly very broadly rounded but with a quite minute 
acute tooth representing the rostrum. The dorsal keel of the carapace situated 
nearly equally distant from the rostrum and from the posterior margin; it is 
high, subtriangular, with the front margin rather steep; the tooth situated far 
behind on the lateral margins of the carapace is large. 
The eye-stalks are uncommonly long, almost longer than broad (fig. 2b) 
and conspicuously longer than deep (fig. 2a).— The antennulae are half devel- 
oped; the distal process from the first peduncular joint reaches not fully to the 
end of third joint; the flagella are equal in length, somewhat longer than the 
sum of the two distal peduncular joints, three-jointed.— The antennae have 
the exopod somewhat shorter than the endopod and not yet developed as 
squama.— The maxillipeds with both rami equal in length and the exopod one- 
jointed.— First pair of thoracic legs twice as long as the maxillipeds; endopod 
with the full number of joints with only a few short setae at the end; the exopod 
not quite half as long as the endopod;a minute bipartite branchia is visible. 
Second pair of legs nearly rudimentary, with a minute branchial rudiment; 
third pair scarcely visible. 
The four anterior pairs of pleopods with both rami setiferous; the exopod 
as long as the stalk, while the endopod is minute. Fifth pair of pleopods small, 
naked, with a transverse suture.— Distal part of telson (fig. 2c) with three 
terminal spines, the intermediate spine somewhat longer than the others, and 
with three pairs of lateral spines, the distal pair a little longer than and twice as 
broad as the intermediate, while the proximal pair are minute. 
Length of the specimen described and figured 2.8 mm. 
The specimen is from the “Albatross” Sta? 4588; October 12, 1904. 
Surface. 
