Bathyal Amphipoda — Barnard 
319 
showed its distribution to extend from a haul 
taken at a maximum depth of 500 m to one 
taken at a minimum depth of 2200 m. Other 
depth data are not reliable since the drags were 
open at all depths. 
DISCUSSION OF Paracallisoma AND 
ALLIED GENERA 
When Chevreux ( 1903 ) described Paracalli- 
soma, only the genus Scopelocheirus Bate formed 
its closed relative, but since that time a number 
of other scopelocheirid genera have been de- 
scribed, as reviewed by Dahl (1959). Holmes 
(1908) described Scopelocheirus coecus which 
was relegated to Paracallisoma alberti Chevreux 
(1903) by Schellenberg ( 1926^), figured his 
specimen sufficiently to show it corresponded 
with Holmes’ description more than with that of 
Chevreux. Indeed, no subsequent analysis of P. 
alberti has shown the distinctive second gnath- 
opod as copied from the original description 
herein (Fig. 3 n, o) . Chevreux described his 
species as lacking a finger on gnathopod 1, but 
apparently subsequent reviewers have assumed 
Chevreux was in error. Even presuming Chev- 
reux did not see the small finger among the 
distal setae as known for S. coecus, all subse- 
quent authors have not given status to the con- 
dition of gnathopod 2 which, as drawn by 
Chevreux, shows a larger finger and longer 
palm than in S. coecus, with the finger failing 
to match the palm. Until Chevreux’s type ma- 
terial can be examined again for these features 
there can be no assumption that Chevreux erred 
in both gnathopods. 
Chevreux did not distinguish Paracallisoma 
from Scopelocheirus, although one might believe 
that the obvious statement "sans trace de dac- 
tyle” would suffice; but we can see that the 
shorter coxae and immense disproportion of 
coxa 5 to coxae 6 and 7 are also of value. Sco- 
pelocheirus coecus shares these features. 
Dahl (1955) described Bathycallisoma to en- 
compass Paracallisoma sp. Schellenberg ( 1955 ) , 
which he thought was his B. pacifica n. sp., but 
in a footnote he wrote that it was S. schellen- 
bergi Birstein and Vinogradov (1958) and 
should be transferred to Bathycallisoma. Birstein 
and Vinogradov (I960) transferred it back to 
Scopelocheirus . But S. schellenbergi appears to 
be distinctly different from the only other two 
species in the genus Scopelocheirus and, as Dahl 
writes in his footnote, if S. schellenbergi belongs 
with Scopelocheirus then Bathycallisoma and 
other scopolocheirid genera should not exist. 
Scopelochewus schellenbergi differs from S. 
hopei and S. crenatus (see Sars, 1895: pi. 19) 
by the shorter coxae, especially noticeable in 
the poorly posteriorly excavate coxa 4, by the 
anterioposterior elongation of coxae 5 and 6, 
apparently by the lack of protrusion of the 
upper lip and epistome, by the very broadened 
plates of the maxillae and maxillipeds, and es- 
pecially by the proximal inflation of the inner 
plate of maxilla 2, these characters all being 
shared by Bathycallisoma pacifica. Apparently 
also the lobes of the lower lip gape widely in 
S. schellenbergi, although Birstein and Vinogra- 
dov show only half of the lower lip and this is 
a criterion noted by Dahl as a generic feature of 
Bathycallisoma. 
One character not mentioned by Dahl, but 
one I believe to be of significance, is the chelate- 
ness of the second gnathopod in both S. hopei 
and S. crenatus. This would make an excellent 
generic difference between Bathycallisoma and 
Scopelocheirus. 
Until Chevreux’s Paracallisoma alberti can be 
rechecked I must retain P. coecus as a distinct 
species that indeed is questionably assigned to 
Paracallisoma. 
Paracallisoma coecus (Holmes) 
Fig. 3 
Scopelocheirus coecus Holmes 1908:500-502, 
figs. 10-12; Shoemaker 1945:186; J. L. 
Barnard 1954:54, pis. 4-5. 
MATERIAL: One juvenile 6.0 mm, Albatross 
Station 4760, northeastern Pacific, 53° 53' N, 
144° 53' W, 2200 fms, May 21, 1906. 
remarks: The mouthparts and telson cor- 
respond to those figured by J. L. Barnard (1954), 
but they are less setose, the outer plate of the 
maxilliped having only 4 lateral setae instead 
of 14. 
family STEGOCEPHALIDAE 
GENUS Parandania Stebbing 
