34 BRYOZOAN FAUNA OF THE ROCHESTER SHALE. 
LlOCLEM V CIRCINCTUM n. Sp. 
PI. X1IT, figs. 11-14. 
The growth of this beautiful species is the same as that of L. explanation, consisting of 
several laminae growing upon each other and producing an expansion several centimeters in 
diameter and three or four millimeters in thickness. ( Villiferous surface smooth, under 
surface covered with a wrinkled epitheca. Zocecia isolated from each other by at least one 
row of numerous small mesopores, sometimes by two or three rows, while in the maculae 
four or five rows may be found separating the zocecia, which here are a trifle larger than 
usual. Because of the number and small size of the mesopores the outline of the zocecia 
varies from many sided to approximately circular, the latter shap ; occurring more frequently. 
An average zooecium is 0.18 mm. in diameter; Gin 2 mm. Mesopores small, polygonal, as 
many as fourteen sometimes obs rved bordering a zooecium. Acanthopores apparently 
wanting. Diaphragms d sveloped at intervals of a tube diameter or less in the mesopores 
but wanting in the zocecia. Tang nt ial s el ions when viewed under a high power show the 
finely granulos i wall structure figured on PI. XIII. » 
The small numerous rri sopor s isolating the zocecia, absence of acanthopores, and explan- 
ate zoarium will distinguish t his I in i sp cii s. /.. explanation, although similar in growth, is 
readily distinguished by its acanthopores, larger zocecia, larger and fewer mesopores, and 
different tabulation of both zocecia and mesopor< s. The other species of the genus are so 
different that comparisons are hardly necessary. 
Occurrence. — Rochester shale, rare at Lockport,N. Y. 
Catalogue number, 35509, U.S. National Museum. 
LlOCLEM \ Ml LTIPOBUM n. Sp. 
PI. XI, figs. 1-6; I'l. XXIII, fig. is; PI. XXVII, fig. 20. 
This species resembles L.asperum in habit of growth, but under a hand lens is easily dis- 
tinguished by having much smaller zocecia and an unusually large number of small acan- 
thopores and mesopores. The surface is smooth and the maculae are composed chiefly o| 
mesopores. Tic zooecia are irregularly rounded oi floriform in outline because of the 
numerous acanthopores indenting their walls. An average zooecium is 0.17 mm. in diameter 
and seven zocecia ma\ l> • counted in 2 mm. Mesopores small, two or three rows usually 
isolating the zooecia, although in the macula' s sven or eight rows may be counted. Acan- 
thopores small, very numerous, seven oi eight often encircling a zooecium, and many 
developed among t he mesopores. 
internally L. mvltiporum exhibits a marked difference from L. asperum, in that dia- 
phragms are almost entirely wanting in both zooecia and mesopores, and in that the walls 
of the peripheral region are consid rably thickened. Fossils incrusted by this species often 
also bear expansions of L. asperum, and such specimens exhibiting the two forms side by 
side show the specific differenc s very clearly. 
All of a small lot of specimens collected at the same locality at Rochester, X. V., showed u 
departure from the usual met liod of growth m that their zoaria rose into dwarfed branches. 
Here apparently the conditions were such as to allow an erect zoarium to develop. 
Occurrence. — An abundant species in the Rochester shale, the typ< s being from Lockportj 
but Rochester, Niagara Gorge, and near Lewiston, N. Y., and Hamilton and (irimsby, 
Ontario, furnish many specimens. Specimens are also found, although more rarely, in the 
Osgood beds outcropping n ar Waldron, End. 
Catalogue numbers, 35501 , 35502, 44122, U. S. National Museum. 
