6. T H E PHYLA PORIFERA, CNIDARIA AND PLATYHELMINTHER
209
of Bucephalus sp. is not rounded and larger in diameter than the preceding section. Rather, it is smaller in diameter and more or less knobshaped. Perhaps some physiological reason for the difference in the
primary site of infection is possible. However, until further detailed
studies are made, it would appear appropriate to refer to the Rhode
Island form as Bucephalus sp. rather than designate it as representing
a new species.
FIG. 11 5. Section through digestive gland of Crassostrea viryinica from Rhotle Island
parasitized by sporocysts of' Bucephalus sp.
The histopathological changes in Crassostrea virginica parasitized
by Bucephalus sp. have been studied by Cheng and Burton (1965b)
and have been reviewed in Chapter 4, Section 11, A, 5 .
4. Bucephalus mytili Cole, 1935. (Figs. 116 and 117)
superfamily Bucephaloidea; family Bucephalidae)
(Superorder Anepitheliocystidia; order Strigeatoidea; suborder Azygiata;
This cercaria was described by Cole (1935) from Mytilus edulis from
Conway, Wales. According to him, Atkins has also found this or a
similar species in M. edulis from Padstow, England.
A.M.B.--8
14