ON RECENT POLYZOA. 557 
‘olyzoa is one of the charms of the ‘ Challenger Report’; and Mr. Busk, 
n his admirable drawings and woodcuts, gives ample material for the 
eginning of a new speciality in the study of fossil and recent Polyzoa. 
Previous to the publication of the ‘Challenger Report,’ however, Mr. 
P. H. Macgillivray published a paper in the ‘ Proceed. Roy. Soc. Victoria,’ 
Aug. 1883, on the chitinous parts of Polyzoa, and he remarks similarly of 
the value of the opercule as previously mentioned by Mr. A. W. Waters. 
Independent, however, cf these labours on the chitinous appendages, 
to the publication of the ‘ Brit. Marine Polyzoa’; and one of the most 
elaborate of these published papers is his Notes on the Genus Letepora 
‘(‘Ann. Mag. Nat. Hist.’ 5th ser. vol. i. 1878). In this paper is enume- 
pated all the recent species described up to that time. This list is as 
1. Retepora phoenicea, Busk=(?) R. indica, D’Orb. 
2. " monilifera, Macgil. 
i porcellana, Maegil!. 
Bs granulata, Macgil. 
- fissa, Macgil. 
»  versipalma, D’ Blainv. (? sp.) 
»»  larsupiata, Smitt = R. cellulosa, var. 
s reticulata, Powrtalés = (?) R. Beaniana, var. 
Ss Wallichiana, Busk & Hincks =R. elongata, Smitt. 
- Edwardsii = (?) R. cellulosa. 
as Beaniana, King. 
* cellulosa, authors. 
¥ Couchii, Hincks. 
a pretenuis, Hincks. 
= plana, Hincks. 
3 tessellata, Hincks. 
‘ , »  vrobusta, Hincks = (?) R. porcellana, Macyil. 
To which may be added, says Mr. Busk— 
_ 18. Retepora bi-avicularia, Smitt = R. Beaniana, var. 
19. »  altisulecata, Ridley. 
+ microthyris, Busk (MS.) 
a 21. :, umbonata, Macgil., var. of R. monilifera. 
22. 6 sinuata, Macgil. a @ 
S 23. 4 lunata, Macgil. (?) ,, 5 
be, 24. »  acutirostra, Macgil. (?) 7 
gy is munita, Hincks (?) ,, Ee 
27. » formosa, Macgil. 
28. » serrata, Macgil. 
29. ey aurantiaca, Macgil. 
«80. » axa, Hincks (? var. porcellana, Macgil.) 
Be ol. te avicularis, Macgil. 
To which must now be added the ‘ Challenger’ species, bringing up the 
described or catalogued number to about fifty or sixty species, 
§ a, Reticulate. 
g Be 82. Retepora apiculata, Busk, ‘Chal. Rep.’ pl. xxv. fig. 6, woodcut, 
| = chitinous appendages, p. 108. 
