380 
Proceedings of the Boycd Society 
B. Triton specimens. 
1. Myzostorna cirriferum^ T. S. Lenckart. 
Hab. Antedon 'petasus. Station 3. Lat. 60° 39' 30" N., long. 
9° 6' W. 87 fathoms. Sand and shells. Temp. 49° F. 
The single individual of Ant. petasus obtained at this station was 
harbouring no less than eighteen examples of this species, some 
adult and some young. It may have therefore yet another host 
besides Ant rosacea and the new Ant. hystrix of the “ Porcupine ” 
dredgings. It has also been found on a specimen of Ant. petasus 
from Norway, in P. H. Carpenter’s own collection ; and likewise on 
another Norwegian example (from Arendal) in the University 
Museum at Kiel. No other species of Myzostorna is as yet known 
to infest Ant. petasus. 
2. Myzostorna carpenter i., sp. n. 
Hab. Antedon dentata. Station 5. Lat. 60° IP 45" N. and 
60° 20' 15" N., long. 8° 15' W. and 8° 8' W. 433 to 285 fathoms. 
Hard ground ; stones. Temp. 43° *5 to 40° *8 F. 
I have dedicated this species to my friend Dr P. H. Carpenter. 
It is of a dirty yellow colour, 2*3 mm. long, and of slightly greater 
width. Twenty short cirri appear at its margin, which is without 
a transparent rim. In fact, the whole disc is firm and opaque. 
The form of the ventral surface is most unusual, and there is no 
trace of the muscular prominence which is so generally present in 
its centre. This would indicate that the parapodial musculature is 
very weak. The parapodia themselves are extremely slender and 
short, being lodged in shallow pits close to the edge of the ventral 
side, and almost on the same level with the equally feeble suckers. 
Both month and cloacal opening are terminal. Attached to the 
dorsal surface of one of the two adults was an immature individual 
•46 mm. long. The very characteristic differences betw en the two 
will be given in the “ Challenger" Eeport, together with the specific 
diagnoses. This is the only species of Myzostorna which has yet 
been found infesting Antedon dentata, better known as Antedon 
sarsii ; and it is as yet only known from the “Triton" dredgings. 
