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PACIFIC SCIENCE, Vol. XVIII, October 1964 
tooth on either side; occludent margin of tergum 
nearly one-third length of occludent margin of 
scutum; portion of scutum below umbo rotated 
approximately 90°, forming continuation of 
occludent margin below scutal umbo; outer 
surface of basal portion of carina marked by 
approximately six rows of low, weak ridges; 
strong beaded ridge seen in M. (M.) striatum 
Hoek, running in arc from below the scutal 
umbones across the basal portion of the scuta 
and carina to the carinal umbo, lacking. 
Prosoma strongly developed; insertion of cir- 
rus I widely separated from that of cirrus II, on 
posteroventral margin of prosoma; single pair 
of dorsal thoracic filamentary appendages situ- 
ated approximately halfway between the in- 
sertions of cirri I and II; cirri long, ctenopod; 
five pairs of setae on intermediate articles of 
posterior cirri, major pairs pinnate; outer surface 
of pedicles of all cirri marked by finely spaced 
lines or broad scales; major spines of caudal 
appendage plumose. 
DESCRIPTION: Terga (Figs. 2 A, B, C- 1) tri- 
angular, occludent margins approximately one- 
third, and scutal margins nearly two-thirds 
length of scuta; outer surface nearly flat, lightly 
marked by transverse growth lines and minute 
longitudinal ridges; terga form a flat continua- 
