108 
PACIFIC SCIENCE, Vol. XII, January, 1958 
covered with nematocysts that stuck to the 
cuticle. 
Two species were sectioned, but there was 
no indication of gonads. Some specimens 
from Vashon Island, however, showed trans- 
verse fission. Although no zoogeographical 
conclusions can be drawn as yet, due to the 
absence of systematic studies in all parts of 
the world except the North European and, 
recently, the Mediterranean coast, I add a 
map (Fig. 2) with the distribution of P. 
leuckarti indicated. Recent information was 
contributed by Schulz (1950, 1952), Nyholm 
(1951), Valkanov (1947), Ruebush (1937), 
etc. The range of distribution makes it very 
likely that the species is cosmopolitan, as is 
already assumed by Nyholm. 
REFERENCES 
Abonyi, A. 1929. Protohydra leuckarti und 
ihre geographische Verbreitung. 10. Sect. 
VIII: 1452-60. Cong. Internatl. Zool. 
Budapest. 
Ekman, S. 1953. Zoogeography of the Sea. Sidg- 
wick and Jackson, London, xiv + 417 pp. 
Luther, A. 1923. Ueber das Vorkommen von 
Protohydra leuckarti Greeff bei Tvaerminne. 
Acta Soc. pro Fauna et Flora Fennica , Ann. 
52(3): 1-23. 
Nyholm, K. G. 1951. A contribution to the 
study of the sexual phase of Protohydra 
leuckarti. Arkiv for Zool. 2(6): 529-30. 
Ruebush, T. K. 1939. The occurrence of the 
two rare genera, Protohydra and Protodrilus , 
on the east coast of North America. Science 
90(2348): 617-18. 
Schulz, E. 1950. Zur Oekologie von Proto- 
hydra leuckarti Greeff (Studien an Hydro- 
zoa, I.) Kieler Meeresf. 7(1): 53-57. 
- 1952. Ungeschlechtiliche Fortpflanz- 
ung durch Knospung bei Protohydra leuc- 
karti Greeff (Studien an Hydrozoa, III). 
Kieler Meeresf. 9(1): 68 - 9 . 
Valkanov, A. 1947. Protohydra leuckarti 
Greeff vom Schwarzen Meer. Arh. Biol. 
Meeresstat. Varna (Bulgarien) 13: 31-35. 
Weill, R. 1934. Contribution a l’etude des 
Cnidaires et leurs Nematocystes, II. Tra- 
vaux de la Sta. Zool. de Wimereux 11:349- 
701. 
