Chromosomes of Eniwetok Opisthobranchiates — Burch and Natarajan 
253 
TABLE 1 
Chromosome Numbers Previously Reported in the Opisthobranchiate Orders 
Notaspidea and Nudibranchia 
SPECIES 
CHROMOSOME 
NUMBER 
2n n 
LOCALITY 
REFERENCE 
NOTASPIDEA 
Pleurobranchidae 
Pleurobranchaea 
n o vaezealandiae 
24 
12 
Japan 
Inaba, 195 9a 
NUDIBRANCHIA 
Dorididae 
Glossodoris f estiva 
13 
Japan 
Inaba and Hirota, 1958 
Glossodoris pallescens 
13 
Japan 
Inaba and Hirota, 1954; 1958 
Rostanga arbutus 
26 
13 
Japan 
Inaba, 195 9a 
Discodoris pardalis 
13 
Japan 
Inaba, 1959^ 
Doris verrucosa 
26 
13 
Italy 
Mancino and Sordi, 1964a 
Dendrodorididae 
Dendrodoris miniata 
26 
13 
Japan 
Inaba and Hirota, 1958 
Dendrodoris nigra 
26 
13 
Japan 
Inaba and Hirota, 1958; 
Triophidae 
Kaloplocamus ramosus 
13 
Japan 
Inaba, 1959^ 
Inaba and Hirota, 1958 
Plocamopherus tilesii 
26 
13 
Japan 
Inaba and Hirota, 1958 
Goniodorididae 
Okenia barnardi 
13 
Japan 
Inaba and Hirota, 1958 
Fimbriidae 
Melibe papillosa 
26 
13 
Japan 
Inaba, 1959a 
Dotonidae 
Doto bella 
13 
Japan 
Inaba, 1961 
Arminidae 
Dermatobranchus striatus 
26 
13 
Japan 
Inaba and Hirota, 1958 
Cuthonidae 
Catriona pupillae 
13 
Japan 
Inaba, 1961 
Facelinidae 
Facelina ceylonica 
13 
Japan 
Inaba and Hirota, 1958 
Facelina japonica 
13 
Japan 
Inaba and Hirota, 1958 
species belonging to 6 families and 4 orders 
(Table 3), which were collected in shallow 
waters around three islands of Eniwetok Atoll 
in the western Pacific by the senior author and 
Dr. William H. Heard during early I960. 
MATERIAL AND METHODS 
The species studied in this investigation and 
the localities where they were collected are 
listed below. Duplicate specimens have been 
deposited in the collections of the Museum of 
Zoology at the University of Michigan, the 
University of Sao Paulo, and the University of 
Hawaii. 
NUDIBRANCHIA 
1. Dendrodoris nigra (Stimpson) (Fig. 1). 
North end of Japtan Island, under loose pieces 
of dead coral. April 1, I960. 
2. Herviella mietta Marcus and Burch (Fig. 
2). North end of Eniwetok Island on the la- 
goon side, in about 10 cm of water at low tide, 
under submerged pieces of dead coral. April 2, 
I960. 
ANASPIDEA 
3. Dolabrif era dolabrif era (Rang) (Fig. 3). 
Under loose pieces of coral on seaward tide flat 
at the north end of Parry Island. March 25, 
I960. 
