PERIPYLARIA, ACANTHARIA. 
Prot 51 
'^Dictyocoryne profunda, Miocene, Maryland, diagnosed, Martin (228) 
p. 454, pi. cxxx, figg. 11-13. 
iHexalonche microsphcera, Miocene, Maryland, diagnosed, Martin (228) 
p. 458, pi. cxxx, fig. 22, 
iHexastylus simplex, Miocene, Maryland, diagnosed, Martin (228), p. 459, 
pi. cxxx, fig. 23. 
iPhacoducus calvertanus n. sp., Miocene, Maryland, diagnosed, Martin 
(228) p. 456, pi. cxxx, fig. 17. 
iPorodiscus concentricus, Miocene, Maryland, diagnosed, Martin (228) 
p. 455, pi. cxxx, fig. 16. 
•^Rhopalodictyum calvertense n. sp., p. 455, pi, cxxx, fig, 15, R. marylandi- 
cum n. sp., p. 455, pi. cxxx, fig. 14, Miocene, Maryland, diagnosed, 
Martin (228). 
Sph(Brozou7)i pu7ictatum, in plankton, Capri, Lo Bianco (205) p. 58, pi. xxxvii, 
fig. 159._ 
fSpo?igasteriscus inarylandicus n. sp., Miocene, Maryland, diagnosed, 
Martin (228) p. 453, pi. cxxx, fig. 10. 
Spongosphcera streptacantha, in plankton, Capri, Lo Bianco (205) p. 59, 
pi. xxxviii, fig. 165. 
Thalassicolla pelagica, in plankton, Capri, Lo Bianco (205) p. 58, pi. xxxvii, 
fig, 160. 
(b) Acantharia :— 
The Acanthometrea, classification of the group, many alterations and ampli- 
fications suggested, Popofsky (270) pp. 28-45 ; occurrence and de- 
scription, id. pp. 47-115 ; nature of skeleton and hydrostatic apparatus 
in, fully described, illustrated from various genera {Acanthometra, 
Amphilonche, Acantho7iia, etc.), Schewiakopf (303) 40 pp., 4 pis. 
Acanthapophysia n. subg. (of Acanthometron) diagnosed, Popofsky (270) 
p. 64. 
Acanthochiasma crudata, p. 52, pi. iv, fig. 2, A. decacantha n. sp., p. 53, 
A. hicuspidata n. sp., p. 53, pi. v, fig, 1, A. plana n. sp., p. 53, pi. iv, 
fig. 7, A. torta n. sp., p. 54, pi. iv, fig. 6, A. quadrangula n. sp., p. 54, 
pi. iv, fig. 4, A. hertwigi n. sp., p. 54, pi. iv, fig. 5, occurrence and 
diagnoses, Popofsky (270). 
Acanthochiasmarium n. subg. (of Acanthochiasma) diagnosed, Popofsky 
(270) p. 51. 
Acanthochiasmidium n. subg. (of A.) diagnosed, Popofsky (270) p. 53. 
Acanthochiasmonium n. SUbg. (of A.) diagnosed, Popofsky (270) p. 54. 
Acantholonche n. SUbg. (of Amphilonche) diagnosed, Popofsky (270) p. 113. 
Acanthometra sp., in plankton, Capri, Lo Bianco (205) p. 59, pi. xxxviii, 
fig. 162 ; [see also under Aca7ithrometron\ 
Acanthometridce (sensu nov.) diagnosed, Popofsky (270) p. 59. 
Acanthometron n. Subg., diagnosed, Popofsky (270) p. 60. 
Acanthometron (as genus = Acanthometra) p. 60, A. bifidum, p, 62, pi. iii, fig. 7, 
A. cordiforme n. sp., p. 62, pi. vi, fig. 2, A. sphixricum n. sp., p. 62, 
pi. vi, fig. 1, A. piriforme n. sp., p. 63, pi. v, fig. 5, A. armatum n. sp., 
p. 64, pi. iv, fig. 3, A. arachnoide n. sp., p. 64, pi. vi, fig. 4, A. spino- 
sum n. sp., p, 66, pi, viii, fig, 5, occurrence and diagnosis, Popofsky 
(270). 
Acanthoma n. subg. diagnosed, Popofsky (270) p, 84, 
Acanthoma (sensu nov.) ahcisa n. Sp., p. 86, A. quadricorna n. sp., p. 89, 
pi, vii, fig, 6, occurrence and diagnoses, Popofsky (270), 
Acanthonidce n. fam., diagnosis, Popofsky (270) p, 84, 
Acanthonidium n. g., p, 91, A. echinoides, p, 91, pi, i, fig, 2, A. claparedei, 
p, 91, pi. i, fig. 3, A. acutum n. sp., p, 93, pi, vii, fig, 7, A. astroide 
n. sp., p. 99, pi. vii, fig. 8, A. tetrapterum, p. 100, pi. vii, fig. 9, occur- 
rence and diagnoses, Popofsky (270). 
