418 Ma Pee Carpenter on certain Points in 
These lists collectively furnish the final column (Q) of the 
Distribution Table. 
POLYZOA. 
A few of the soundings contained specimens of Polyzoa in 
more or less fragmentary condition. These have been iden- 
tified by my good friend the Rev. A. M. Norman as follows :— 
No. 500. Menipea arctica, Busk. 
Crisva eburneo-denticulata, Busk. 
In this sounding, and also in No. 516, there are examples 
of a very interesting simple form, the type of an undescribed 
genus. 
No. 514 a. Idmonea atlantica, Forbes. 
Crisia eburneo-denticulata, Busk. 
No. 515. Crista eburneo-denticulata, Busk. 
No. 525. Lepralia Jeffreys’, Norman. 
Idmonea atlantica, Forbes. 
Hornera lichenoides, Linné. 
EXPLANATION OF PLATE XXI. 
Fig. 1. Haplophragmium nanum, Brady, magnified 120 diam.: a, supe- 
rior lateral aspect; 6, inferior lateral aspect; ¢, periphero-lateral 
aspect. 
Fug. 2. iene arctica, Brady, magnified 120 diam.: a, lateral aspect ; 3, 
end view, with aperture. 
Figs. 3, 4. Hippocrepina indivisa, Parker, magnified 60 diam.: a, lateral 
aspect; 6,end view, with aperture. 4. Section, showing the 
interior. 
Fig. 5. Nonionina orbicularis, Brady, magnified 65 diam. : a, lateral aspect ; 
b, periphero-lateral aspect. 
Fig. 6. Discorbina Wrightit, Brady, magnified 85 diam.: a, superior lateral 
aspect; 6, inferior lateral aspect; ¢, periphero-lateral aspect. 
XLI.—On certain Points in the Morphology of the Blastoidea. 
By P. HERBERT CARPENTER, M.A., Assistant Master at 
Eton College. 
Since the appearance of the classical memoir by Rémer 
scarcely any attention has been paid upon this side of the 
Atlantic to the morphology of the Blastoidea. In America, 
however, the case has been very different. White, Shumard, 
Billings, Lyon, Hall, Meek and Worthen, and various other 
