VoL. 2 | Robertson.—Non-Incrusting Bryozoa. 257 
merly identified as Scrupocellaria scabra Van Beneden with 
Menipea erecta Robertson (700). 
This species is obtained from three localities, Kadiak and 
Sitka, Alaska, and San Juan Island, Puget Sound. The range 
of variation is considerable, but is not greater than frequently 
occurs in a species found in localities so remote, and consists 
mainly in the presence or absence of spines or avicularia. The 
specimens from Sitka, for example (fig. 30), show irregular 
development of frontal avicularia with entire absence of lateral 
avicularia. The colonies from Kadiak (fig. 29) show frequent 
absence of lateral avicularia and their replacement with spines; 
while a few zoecia from San Juan specimens (fig. 31) show an 
entire absence of spines and considerable variation in the size 
of the lateral avicularia. 
10. Menipea pribilofi sp. nov. 
Pl. VII, figs. 32, 33; Pl. VIII, fig. 34. 
Zoartum forming a compact mass 25-50 mm. high, attached 
by a large number of root fibres; the upward tendril-like fibres 
being very slightly developed (Pl. VII, fig. 32.). Branching 
dichotomous, main branches long, possessing a number of shorter 
inward curving secondary branches. Jnternodes consisting of 
three zocecia except the ocecial internodes which generally con- 
sist of five; separated by dark colored chitinous joints. Zowcia 
relatively short and stout, broad at the top, attenuated below, 
aperture occupying less than half the front surface, with three 
spines on its upper margin; the bifureating zocecium may have 
but two spines, but it is frequently found bristling with three 
or four. Scutum (Pl. VIII, fig. 34, sc.) simple, often a mere 
spinous process; when better developed, it broadens at the free 
extremity. Spines and secuta distinctly jointed. Lateral avi- 
cularia generally present, large (lat. av.). Frontal avicularia 
(fr. av.) few, when present found only on the zocecium at the 
bifureation of a branch, large, raised, beak set obliquely, some- 
times transversely to the length of the zocecium. Owcia globose, 
smooth (Pl. VII, fig. 33, 0e.). Rootlets in two positions. Those 
