310 
PACIFIC SCIENCE, Vol. XVIII, July 1964 
five teeth on incisor, leaflike lacinia mobilis, 
large molar process, but with no palp. First male 
pleopod bifurcate at tip with spines along edges. 
Second male pleopod with curved copulatory 
process (recurved under tip of pleopod itself). 
Uropods biramous. 
MEASUREMENTS: Holotype male, 1.8 mm 
long. 
TYPE LOCALITY: 6003; Dec. 16, 1938; 135 m; 
4.6 miles 137 degrees from Gavita Pier. Taken 
from green silty mud by an Orange Peel Grab. 
Lat. 34°-24'-45", long. 120°-08'-40". 
MATERIALS EXAMINED: One male from type 
locality. 
DISTRIBUTION: The other species of the 
genus, with the exception of A. tiller ae Menzies 
and Barnard (1959), have a circumpolar distri- 
bution in the Antarctic Sea. 
AFFINITIES: A. erratum, n. sp., differs from 
A. tillerae by the longer lateral extensions of 
the pleonal segments, especially the last four. 
The new species is much like A. glohifrons 
Menzies (1961), from which it differs in the 
type and location of the eye stalks. There are 12 
rather than 10 setae along the apical edge of 
the pleotelson in A. erratum, n. sp. 
Munna Kroyer 
Munna ( 1] romunna ) magnijica, new species 
Fig. 2 
This new species is placed in the subgenus 
U romunna Menzies ( 1962 ) because the ventral 
uropodal ramus is leaflike and lacks a recurved 
apical spine. 
DIAGNOSIS: Minute unpigmented species with 
apparently five, but in fact seven, peraeonal seg- 
ments. No spines found on frons or anterior 
borders of peraeonal segments. Anterior borders 
of cephalon convex. Coxal plates of peraeonal 
segments two to seven visible in dorsal view. 
(Segment seven underneath pleotelson.) Eyes on 
short stalks and with few ocelli. Peraeopods very 
long, about 1 l /i times length of body; well pro- 
vided with spines; ending in clawlike dactyli. 
First peraeopod shorter than body, laterally com- 
pressed with many stout spines, especially on 
ungus. Propodus with five large spines on an- 
terior border. Second antenna about 2 Vl times 
body length with about 45 flagellar articles. First 
antenna much shorter than body with about 
nine segments including three elongate flagellar 
articles of about same length plus two very 
short apical articles and tipped with sensory 
setae. Maxilliped with many large curved setae 
on palp. Mandible with well-developed molar 
process, toothed incisor and palp of three seg- 
ments. Uropods biramous, ventral ramus leaflike 
with at least five plumose setae. 
measurements: Holotype female (with lar- 
vae in marsupium), 2.0 mm long. 
TYPE LOCALITY: 2969; Oct. 31, 1954; 500 
m; 13.1 miles WNW of Santa Barbara Island; 
taken from black mud, nodules and flat shaley 
rocks by Orange Peel Grab. Lat. 33°-35'-59", 
long. 119 0 -15'-11". 
DISTRIBUTION: Known only from two speci- 
mens from type locality. 
AFFINITIES: M. magnifca, n. sp., is much like 
M, ( U.) nanna Nordenstam (1933) in the ap- 
parent lack of the dorsal outline of segments one 
and seven. The second antenna of the new spe- 
cies is very much like that of M. (U.) lundae 
Menzies (1961), except that in the new species 
there are three long flagellar articles, not two. 
ILYARCHNIDAE 
llyarchna G. O. Sars 
llyarachna acarina Menzies and Barnard 
Fig. 3 
llyarachna acarina Menzies and Barnard 
(1959), pp. 9, 10, fig. 2. 
llyarachna acarina Menzies and Barnard, 
Schultz (1964). 
MATERIALS EXAMINED: 2969(1); 4767 ( 1 ) . 
DISTRIBUTION: 13.1 miles WNW of Santa 
Barbara Island; 500 m. 
REMARKS: Specimen 4767 is from a coastal 
shelf bottom station the location of which has 
been recorded before by Menzies and Barnard 
(1959:10). The single specimen taken at the 
station was a large male and Figure 3, 1, 2, 
shows the male second pleopod and the first 
Fig. 2. Munna ( Uromunna ) magnijica, new species. 1, Dorsal view of a female; 2, maxilliped; 3, first 
maxilla; 4, first antenna; 5, second maxilla; 6 , uropod; 7, hypopharynx; 8, first peraeopod; 9, mandible (two 
views). 
