54 C. H. F. Peters—Positions of two Planets. 
erately convex, white, shining, mostly imperforate and smooth, 
the marginal ones more or less perforate in front. Apertures » 
numerous, slender, convergent spinules, which nearly reach 
the center, giving the pore a stellate appearance. Avicularia 
of zocecia, ‘60 to ‘70™; breadth, 50 to -60™"- breadth of ap- 
ertures, ‘12 to ‘15™™; of median pore, ‘05 to 06™™, The zocecia 
are about twice as large as those of P. ciliata. 
Casco Bay, Maine. (U.S. Fish Comm., 18738). 
In the nearly circular form of the median pore this species 
approaches the genus Porina, as restricted by Smitt, (Florida 
ryozoa), but in all other respects, except size, it agrees so 
closely with P. ciliata, made the type of Porellina by Smitt, as 
to forbid a generic separation, although the latter has a 
crescent-shaped pore. It would belong to Microporella Hincks, 
if that name be adopted. 
‘ 
Art. VIII.— Positions of the Planeis Philomela and Adcona ; by 
C. H. F. Perers. 
I COMMUNICATE a few observations on a planet discovered 
by me on the 14th of May. I have given to it the name 
Philomela, as the name Prokne is applied to the one discovered 
on March 21. The planet lately found (May 21) by Mr. Palisa | 
seems to be Adcona (145), which for several years had been 
searched for in vain, its elements having remained very uncer- 
‘ tain, since my observations at its first appearance, the only 
ones made upon it, did not extend over more than about a 
month (from June 3 until July 7, 1875). I append the two 
n 
positions I succeeded in getting before the last moon. 
Observations on Philomela (196). 
1879. Ham. Coll. m. t. App. a. pp. dé. log (p."A) No. of comp. 
ay 14. 11556™31* 1216™39%-02 +6°52’46"-9 0-682 0-736 12 
3610 6 123 16° 91°21 48 57 0509 0-724 10 
18 1225 36 1216 6%5 6 42 307 0-747 0-746 10 
20, 51 4 12 15 68-20 6 36 57-0 0391 0-723 12 
25. 10 22 18 12 15 57°02 619 57-8 0-572 0-731 10 
June 5. 10 6 55 12 17 3714 +5 32 346 06340742 9 
Observations on Adcona (145) (?). : 
18' mt. App. a. log (p."A) No. of comp. 
May 28 14527" Js “15h 55™ 11-71 —15°30722"-8 0-677 0-851 7 
_ Ss 64 
5 18°81 —15 30 54:6 0°343 0-875 12 
Hamilton College, Clinton, N. Y., June 6, 1879. 
phi ae aN 
