JAPANESE CHEILOSTOMATOUS BRYOZOA. 409 



the anterior end of zoœcium. The last mentioned spine is limited in its 

 occurrence to the zocecia which constitute the outer branchlet of a 

 biforked branch. Scutum small, commonly bifid, though not unfrequently 

 trifid. Lateral avicularium with the triangular mandible hooked, sharply 

 pointed at the end ; present on each zoœcium at the upper outer angle, 

 just behind the three laterally outstanding spines. Frontal avicularium 

 small, raised, with triangular transversely directed mandible ; present on 

 each zoœcium to one side below the aperture. Oœcium prominent, 

 rounded, slightly expanded anteriorly, smoothly surfaced, with a semi- 

 orbicular thin area marked out a!: the basal margin. Unsegmented 

 rootlets given off from a small projection with elliptical peristome and 

 situated near the inferior end of zoœcium on the dorsal side. 



Of this new species, there exist in the collection : a large fragment 

 from Okinosé in the Sagami Sea, depth 312 fins., and a complete 

 zoarium attached on a Brachiopod, from off Ukishima (Prov. Izu ?). 

 The species is characterized by the slender and delicate nature of the 

 parts of colony and especially by the loose arrangement of zocecia, 

 which latter character seems to indicate relationship with Bicellarian 

 genera. 



2. Meni pea occidentali* Trask. 



Mjenipea occidentali!, Trask 1857, Proc. Cal. Acad. Sci., 113, pl. iv, fig. 4. — 

 Robertson 1905, Univ. Calif. Puhl. Zool., vol. II, 254, pi vi, figs. 22-25. 



Metiip£a compacta, Hincks 1882, Ann. Mag. Nat. Hist., 5, X, 461. — Hincks 

 1884, Ann. Mag. Nat. Hist., 5, XIII, 2c8, pi. ix, fig. 8. 



A few large colonies referable to typical M. occidentalis are con- 

 tained in the collection. They were obtained from the shallow water 

 near Misaki, in the Yokohama harbour and at Ozu in the Ebaraki 

 prefecture. 



3. Menipea occidentalism var. catalinensis Robertson. 



Menipea occidentalis, var. catalinensis, Robertson 1905. Univ. Calif. Pub. Zool., 

 vol. II, 255, pi. vii, figs. 26, 27. 



This form is quite common in shallow water near Hakodate, 



