Second Report on Hawaiian Polyclads 
Libbie H. Hyman 1 
The material of this report was kindly pre- 
sented to me by Dr. C. E. Cu tress. It adds slightly 
to our knowledge of the polyclad fauna of the 
Hawaiian Islands, reviewed in my previous re- 
port (Hyman, 1954). To the references given 
therein should be added Pease (I860), previ- 
ously overlooked. Pease described and illustrated 
in color four polyclads from the Hawaiian Is- 
lands ( exact location not stated ) ; of these two 
are probably not identifiable. 
The present specimens were collected under 
rocks in the intertidal zone at Makapuu Point, 
Cahu, in March, 1953. 
ORDER POLYCLADIDA 
SUBORDER ACOTYLEA 
SECTION SCHEMATOMMATA 
FAMILY PLANOCERIDAE 
Paraplanocera oligoglena (Schmarda, 1859) 
The occurrence of this almost circumtropical 
species in the Hawaiian Islands was previously 
recorded (Hyman, 1954: 333). The present 
specimen measures 28 by 21 mm. It is thin and 
ruffled; the color in life is described as tan or 
buff dotted with dark brown. There is little 
doubt that Peasia reticulata Pease (I860: 37) 
is identical with Paraplanocera oligoglena. Pease 
gives a recognizable colored figure (pi. 70, figs. 
1, 2) and a colored figure also appears in 
S tummer -Traunf els (1933, col. pi. following p. 
3596, fig. 6) . 
SUBORDER COTYLEA 
FAMILY PSEUDOCERIDAE 
Thysanozoon hawaiiensis, n. sp. 
Fig. 1 
The single specimen is of oval form and thin 
consistency, measuring 24 by 13 mm. The color 
in life was stated to be light ochre with dull- 
1 American Museum of Natural History, New York, 
N. Y. Manuscript received January 26, 1959. 
green papillae. At the center of the anterior 
margin are seen the usual pair of tentacular 
folds, bearing eyes. Behind them is a rounded 
cluster of cerebral eyes. This is followed by the 
ruffled pharynx of compact oval outline. Be- 
cause of damage in the critical region, just be- 
hind the pharynx, it could not be determined 
whether the male apparatus is single or paired. 
The female gonopore and the sucker, located 
as shown in the figure, were readily noticeable. 
The sucker occurs at about half the length of 
Fig. 1. Thysanozoon hawaiiensis. 1, Tentacles; 2, 
cerebral eye cluster; 3, pharynx; 4, female gonopore; 
5, sucker; 6, uteri with eggs; 7, papillae, shown in 
part only; 8, mouth. 
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