30 
W. M. TATTERSALL. 
The absence of median setae from the apex of the telson is not necessarily 
of generic importance, since the genera Pseudomma and Dactylerythrops both contain 
species in some of which these setae are present, and others in which they are 
wanting. As, however, all three species at present referred to this genus are without 
median apical setae, it is convenient to retain this character in the generic definition. 
Dactylamblyops hodgsoni. 
(PL VI., Figs. 9-16.) 
Dactylamblyops hodgsoni, Holt and Tattersall, 1906 (1). 
Dactylerythrops arcuata, Illig, 1906. 
Locality of capture :—Lat. 66° 52' 09" S., long. 178° 08' 15" E., 2030 fathoms, 
one specimen, male, 13 mm. 
The single specimen in the collection is considerably damaged, the antennules, 
antennal scales, and the third to the eighth thoracic limbs being missing. A complete 
description is therefore not possible, but it is hoped that as many of the characters as can 
/ . /3 f be made out with certainty will suffice for future recognition of the species in collections. 
Carapace submembranaceous, covering all the thoracic segments except the last 
one, anterior margin produced into a blunt, broadly but evenly rounded rostrum 
projecting between the eyes ; cervical sulcus well marked ; antero-lateral angles rounded. 
Pleon slightly longer than the carapace ; first five segments subequal in length ; 
sixth nearly twice as long as the fifth. 
Eyes (Fig. 9) small, placed on definite peduncles, not in any way contiguous, 
pyriform in shape, external angle evenly rounded, a short digitate process arising from 
the inner dorsal face; visual elements imperfectly developed, apparently represented 
by numerous minute granular bodies with a refractive centre ; a large opaque ganglionic 
mass, probably the optic nerve, visible in the peduncle, from which a nerve fibre 
proceeds to the cornea.. 
Antennal peduncle short, composed of three subequal quadrangular joints. 
Antennal scale broken on both sides, but there does not appear to be a spine on 
the outer corner of the basal joint. 
Mouth parts (Figs. 10-13) not differing markedly from those figured by Sars for 
Amblyops abbreviata (1870-79). 
First thoracic limbs (Fig. 14) with the endopod substantially of the same form as 
in A. abbreviata. 
Second thoracic limbs (Fig. 15) of essentially the same structure as in A. abbreviata, 
but with the endopod apparently much longer, being nearly twice as long as the 
endopod of the first thoracic limbs. 
Genital appendix to the last thoracic limbs of the male terminating in two lobes, 
the larger of which bears six long setae, the smaller one being devoid of setae, but 
apparently having a covering of very fine hairs, 
