10 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
REMARKS.—This copepod normally is found on the fins of the 
host, most frequently on the trailing edges of the dorsal and pectoral 
fins. 
Echthregaleus denticulatus Smith 
Echthrogaleus pellucidus Shiino, 1963, p. 357. 
For earlier synonymy, see Cressey, 1967a, p. 56. 
MarTerrau.—One collection from off Scripps Pier, La Jolla, Calif.; 
one collection from the central Pacific in the vicinity of Christmas 
Island; six collections off Chile and Peru, R. V. Anton Bruun, Stations 
553, 554, 568, 569, and 571; and four collections from the Indian 
Ocean previously reported (Cressey, 1967b). 
Remarks.—No description of either sex of this copepod will be 
given herein as that of Shiino (1963) and of Cressey (1967a) are 
adequate. I have placed E. pelludicus Shiino in synonomy after re- 
examining the type of E. denticulatus Smith deposited in the USNM. 
The only differences among all the material I have collected recently, 
the description of E. pellucidus by Shiino, and the type-specimen is 
that the type is larger. The type-specimen was collected in the North 
Atlantic, whereas all other material has come from the Indo-Pacific. 
Cressey (1967a, p. 27) reported a similar situation for another species 
of parasitic copepod, Phyllothereus cornutus, where the specimens 
collected from the colder waters of the Atlantic were larger than those 
from the relatively warmer Indian Ocean. 
These copepods generally are found on the body surface of the host, 
frequently in the anterior part near the gill slits. Although there was 
a high incidence of infestation on mako sharks off Chile and Peru, 
the number of individuals on any one shark was never more than 20. 
This same species was collected in the Indian Ocean from thresher 
sharks, Alopias vulpinus, and often occured on that host in clusters 
of more than 100 individuals. 
Anthosoma crassum (Abildgaard) 
For earlier synonymy, see Lewis, 1966, p. 66. 
Mareriau.—F our collections from off Scripps Pier, La Jolla, Calif. ; 
four collections from the central Pacific in the vicinity of Christmas 
Island; one collection from off Sandy Hook, N.J.; two collections from 
the Indian Ocean, previously reported (Cressey, 1967b) ; one collection 
from the North Atlantic taken during a cruise of the M. V. Delaware; 
seven collections from off Chile and Peru, R. V. Anton Bruun, 
Stations 552, 553, 554, 558, 564, 568, and 571. 
ReEeMARKS.—This species has been well described by Shino (1955) 
and Lewis (1966) and no further description will be given herein. 
On the mako sharks caught off the western coast of South America, 
this species was very common and was always found imbedded be- 
