270 
anatomy of the genus, by Mr. Moss, in the second part of 
the ‘ Linnzan Transactions’ for 1870. The mode of develop- 
ment of Merten’s ‘“‘ Haus” is there satisfactorily explained, a 
phenomenon I have not yet witnessed ; but in none of the 
examples examined does the author report the occurrence of 
the conditions encountered by myself. 
In conclusion, it is not without the greatest diffidence I 
venture to record the result of my own observations, after the 
diversely expressed opinions of naturalists of such high 
standing; yet I the more willingly do so, in the hope that 
it may lead to further investigation, and stiill more important 
discoveries on the part of those to whom these ocean waifs 
are already to a large extent familiar. 
Larva of Ecutnoruyncuvs ? (Pl. XIV, figs. 5—7.) 
Remarks on this form will be published in a future number 
of this Journal. The examples from which the accompanying 
drawings were made were taken floating at the surface of the 
sea, on the same day and under similar circumstances to 
those associated with the capture of the Appendiculariz. 
An ImprovED APPARATUS for Drawine with the Micro- 
scopr. By E. T. Newton, H.M. Geological Survey. 
THE camera lucida, which is very generally used for 
drawing with the microscope, has, in common with most of 
the instruments used for this purpose, the disadvantage of 
requiring the microscope body to be placed in a horizontal 
position. 
The inconvenience of having to move the microscope after 
the object has been adjusted, makes it very desirable that 
some means should be devised by which this could be ob- 
viated. The instruments described by M. Nachet, jun. 
(Quart. Micros. Journ.,’ Vol. VIII, p. 158) all require the 
microscope to be placed in a definite position, and are some- 
what complicated. As these are constructed upon a principle 
altogether different from that of the apparatus under con- 
sideration, it will not be necessary here to do more than call 
attention to them. A form of prism described by Dr. John 
Antony, as Nachet’s,! when mounted in the same way as a 
camera lucida, can be used for drawing when the microscope 
1 * The English Mechanic,’ Dec. 2, 1870, p. 251. 
