in reply to Dr. J. E. Gray. 399 
he would have found that what he calls oscula are, as I called 
them in the description he quotes, polype-cells containing polypes 
having tentacles and all the internal organization, including a 
distinctly plicated stomach, exactly like the zoanthoid polype 
named Polythoa or Corticaria.’ How the stomach of the sup- 
posed polype can be like that of Corticaria, a genus of Coleo- 
pterous insects, is beyond my comprehension; but it may be 
that the author meant to write Corticifera, a generic name 
of Lesueur for Zoanthus. The assertion that I did not seem 
to have considered it necessary to examine the specimens is also 
inaccurate ; and it must have escaped the memory of Dr. Gray 
that in 1860 the specimens alluded to were, by his direction, 
placed in my hands for examination, that for two days, during 
nearly four hours of each, I was engaged in the Entomological 
Department in a careful microscopical examination of their 
anatomical structures, and that a portion of the results of those 
examinations were published in the second part of my paper “On 
the Anatomy and Physiology of the Spongiadz”’ in the ‘ Philo- 
sophical Transactions’ for 1861, and were illustrated by no less 
than thirteen figures in two of the plates accompanying that 
Part. In plate xxxi., figures 3, 4, 5, 6, and 7, and in plate 
Xxxvl. figures 12, 20, 30, 34, 35, 36, 37, and 38, are all from the 
specimen of Hyalonema in the British Museum, excepting fig. 7, 
plate xxxi., which is from the specimen in the Bristol Museum. 
I did not deem it necessary to refigure the specimen in the 
British Museum, as it had been so accurately and beautifully 
drawn by Mr. Ford for the ‘ Proc. Zool. Soc.’ for 1857, plate ix. 
Radiata. : 
Dr. Gray blames me for supposed hasty conclusions and 
inaccuracies, and at the same time exhibits the like symptoms 
in his own observations: thus in page 288 he writes Halichondra 
in place of Halichondria, Alcyonellum (p. 298) instead of Alcyon- 
cellum, and Euplatella in place of Huplectella, and, throughout the 
whole of the paper, Polythoa* apparently instead of Polyzea, or 
of Palythoa, Lamouroux, a genus of Zoanthidee. 
Dr. Gray adopts the idea of M. Barboza du Bocage, that the 
protuberant bodies from the bark of Hyalonema are allied to 
Zoanthus, and that they bear on their summits the tentacles of 
the polypes; and the figure of those parts by M. Barboza du 
Bocage in the ‘ Proceedings of the Zoological Society’ for 1864, 
plate xxxui. fig. 3, if he thinks fit to assume that as a correct 
representation of tentacula, would seem to justify him in that 
idea; but a little consideration would have informed him that 
the tentacles of polypes are always situated on the oral portion 
of the animal, and not on the surrounding portions of the 
* [For this mistake the printer is to blame. It should have been 
Palythoa throughout, instead of Polythoa.—Ep. } 
