128 
PACIFIC SCIENCE, Vol. XVIII, April 1964 
Family Pupillidae 
Gastrocopta ( Sinalbinula ) pediculus 
( Schuttleworth ) 
Marshall Island records: Ebon (Pease, I860). 
Distribution on Rongelap: Arbar, Gogan, 
Burok, and Mellu. 
This snail was the most abundant on the 
atoll and comprised nearly 50% of the shells 
collected. Live specimens were taken at each of 
the stations listed. It was found commonly on 
and around dead coconut leaves. One specimen 
was collected by Dr. van der Schalie on the 
island of Japtan, Eniwetok Atoll. 
Family Tornatellinidae 
Lamellidea pusilla (Gould) 
Marshall Island records: Ebon (Pease, I860; 
Pilsbry and Cooke, 1915-1916). 
Distribution on Rongelap: Arbar, Gogan, and 
Mellu. 
Although Lamellidea was not abundant at any 
of the stations, the series (including a number 
of juveniles) was large enough to make a satis- 
factory determination. Pease’s Tornatellina nitida 
and Lamellidea serrata belong with this species 
(Cooke and Kondo, 1960:190). 
Family Flelicarionidae 
Liardetia ( Liardetia ) samoensis (Mousson) 
( = striolata Pease ) 
Marshall Island records: Ebon (Pease, 1860). 
Distribution on Rongelap: Gogan; only 10 
dead specimens were found. 
Family Subulinidae 
Lamellaxis ( Allopeas ) gracilis (Hutton) 
Marshall Island records: none. 
Distribution on Rongelap: Arbar, Gogan, 
Burok, and Mellu. 
Although this widely distributed snail was 
found on four of the five islands, visited, it was 
not abundant on any of the islands and repre- 
sented only 6% of the whole collection. Living 
specimens were taken from Gogan and Mellu. 
Dr. van der Schalie also collected a series of live 
L. gracilis on the island of Japtan, Eniwetok 
Atoll. 
Family Truncatellidae 
Truncatella ( Truncatella ) guerinii A. and J. B. 
Villa {—valida Pfeiffer) 
Marshall Island records: none. 
Distribution on Rongelap: Mellu and Keishi- 
echi. 
T. guerinii was very commonly collected on 
two of the islands and comprised one quarter 
of the collection. It was found living at both 
stations. 
Truncatella ( Truncatella ) granum Garrett 
Marshall Islands records: none. 
Distribution on Rongelap: Arbar; 5 speci- 
mens, 2 living, were found. 
Family Assimineidae 
Assiminea nitida marshallensis Abbott 
Marshall Island records: Bikini, Eniwetok, 
Rongelap (Abbott, 1958). 
Distribution on Rongelap: Enybarbar, Aru- 
baru, Mellu, Aruboru (Abbott, 1958), 
Arbar. 
This species was collected commonly on 
Arbar. Of the 56 specimens examined only 1 
had attained the maximum growth that is char- 
acteristic of this subspecies. 
Assiminea cf hidalgoi Gassies 
Marshall Island records: none. 
Distribution on Rongelap: Arbar. 
Eight specimens of Assiminea, which closely 
resemble New Caledonian specimens of A. 
hidalgoi, were found with A. nitida marshallen- 
sis . A. hidalgoi is a part of a widespread but, 
as yet, unclarified complex of species (Abbott, 
I960). Since the systematics of the species 
outside the Philippines are in a confused state, 
it seems best not to assign a definite identifica- 
tion to the species in question. The radula for- 
mula observed in these specimens is: centrals 
4—1—4 5—1—5 . . ^ . 
to ; laterals 6-1-7; inner mar- 
0-0 0-0 
ginals 9-10; outer marginals 15 + . 
ADDITIONAL RECORDS 
The following nine species have been re- 
ported from the Marshall group but were not 
