FISHERY BULLETIN; VOL. 7L NO. 2 



measurements resemble those given for C. 

 grampicola by Johnston and Mawson (1941) 

 from Risso's porpoise, Grampus griseiis (Cuvier, 

 1812), taken at New South Wales, Australia. 

 Another single specimen with Cmssicauda 

 affinities was recovered by James G. Mead, 

 University of Chicago, Department of Anatomy, 

 while dissecting the head of a S. gmffmani. 

 The worm was taken from the pterygoid air 

 sinus. The pterygoid bone was eroded in the 

 region in which the specimen was found. We 

 assume that extensive bone damage found by 

 us in other specimens we examined (Figure 8) 

 was also caused by infestations of this nema- 

 tode, although, judging from the published 

 literature, the possibility cannot be dismissed 

 that more than one species is involved. Reysen- 

 bach de Haan (1957) reported SteiiKrus globi- 

 cephalae Baylis and Daubney, 1952, in the 

 sinuses and cava tympani of the pilot whale, 

 Globicephala melaeiia (Traill, 1809). Norris 

 and Prescott (1961) collected "large quantities 

 of a nematode {Stenurus sp.)" from the lateral 

 air sinus of a dall porpoise, Phocoenoides dalli 

 (True, 1885). Tomilin and Smyshlyayev (1968) 

 reported that a "nematode Stenurus mi)ior 

 attacks the hearing organs of the Black Sea 

 porpoise Phocae)ia and by clogging the cavity 

 around the earbone may kill its host or severely 

 complicate its existence." Brodie (1971) re- 

 ported Crassicanda sp. as a middle ear parasite 

 of the white whale, Delphiuapterus leucas 

 Pallas, 1776, in Cumberland Sound, Baffin 

 Island. Yamada (1956) examined skulls of 

 approximately 80 false killer whales, Pseudorca 

 crassideiis, from a stranded group of approxi- 

 mately 150 and found "basket-like" lesions 

 in the pterygoid region of 40 skulls. He as- 

 cribed the damage to parasitic infection, "most 

 probably by nematodes," and stated that such 

 damage is a common occurrence in Grampus 

 and Globicephala in Japanese waters. 



Trematoda 



The trematodes recovered during this study 

 are represented by two genera known from 

 marine mammals and three specimens of one 

 genus that has been found in teleost hosts. 



ZcdophotretJiii piicificimi sp. n. 

 (Figures 9 and 10) 



Description: Based on measurements from 

 26 specimens. With characteristics of the genus. 

 Body elongate. Dorsoventrally flattened, 10 mm 

 (8.3-12.6) long by 1.7 mm (1.4-2.0) wide. Cuticle 

 spinose. Oral sucker 535 ^ (398-592) long by 

 575 /J (439-673) wide; opening slightly sub- 

 terminal. Pharynx pyriform, 494 /j (398-541) 

 long by 314 ju (255-367) wide. Intestinal cecum 

 bifurcates immediately caudad to pharynx with 

 each lateral branch dividing into short anterior 

 and long posterior portions. Both anterior 

 and posterior cecal branches contain numerous 

 diverticula; anterior branch terminating lateral 

 to posterior edge of oral sucker, posterior 

 branch terminating near posterior end of body. 

 Excretory pore terminal. Acetabulum 600 n 

 (520-710) in diameter, located approximately 

 mid-body. Cirrus unarmed. Testes large, lobed, 

 in tandem and extending posterior to equa- 

 torial third of body. Ovary pretesticular, lobed, 

 333 i^f (235-418) long by 477 /i (310-765) wide. 

 Mehlis's gland posterior and dorsal to ovary. 

 Uterus coiled, preovarian. Genital pore just 

 preacetabular. Vitellaria follicular, occupying 

 entire anterior half of body from level of 

 genital pore to shoulder region of ceca, extend- 

 ing posterior from genital pore in lateral bands 

 to posterior end of body. Eggs, oblong, oper- 

 culate, round in cross-section, mean measure- 

 ments of 20 eggs, 61 IX long by 42 /i wide. 



Hosts: Stoiella lougirostris, Stenella graff- 



mairi. 

 Location: Pancreatic duct. 

 Locality: Eastern tropical Pacific Ocean; 



holotype from S. graffmani collected at 



lat 12°5'N, long93°18'W. 

 Type specimen: USNM Helm. Coll. No. 



72158. 



Remarks: Currently there are three species 

 in the genus Zalophotrema (Stunkard 

 and Alvey, 1929): Z. hepaticum Stunkard 

 and Alvey, 1929, described from the 

 bile ducts of a California sea lion, 

 Zalophus califor)ria)ius (Lesson, 1828), 

 at the New York Aquarium; Z. cunlensis 

 Gubanov, 1952, from the bile ducts of 



460 



