ON PENNELLA BALZNOPTER. 431 
like appendages so characteristic of Conchoderma aurita. My specimen in general 
form and characters resembled that figured by Darwin in plate iii. fig. 2, but it had 
_ three, and not four, purple stripes in the mantle. 
In conclusion, I would express my acknowledgments and thanks to Mr Joun 
Henperson, Assistant Keeper of the University Anatomical Museum, for the aid which 
he has given me in preparing the numerous sections examined in the course of my 
research, and for photographing those which illustrate the internal anatomy of the 
parasite, many of which have been reproduced in three of the plates. 
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