4 
variety of Crisia dent. described by Hincks in his monograph of 
the British Polyzoa. I propose to indicate this variety by the name 
„tenuis’. 
Height 3 inch. Not abundant. 
Locality. Barents-Sea. 77° N. lat., 45°48' E. long. 110 fathoms. 
Habitat. On Ascidians. 
3. Crisia eburneo-denticulata. Smitt. 
Zoarium stout and erect, showing the habit of Crisia denticu- 
lata var. tenuis. The ooecia resemble most strikingly those of 
Crisia eburnea; they are pyriform and thickly punctate. 
Height ? inch; rare. 
Locality. Barents-Sea. 76° 5',3 N. lat., 42° 8’ E. long; 150 fathoms. 
Habitat. On zoophytes. 
Group Il. Inerustata, d’Orbigny. 
Family TUBULIPORIDAE. 
Genus: Idmonea, Lamouroux. 
4. Idmonea atlantica. E. Forbes. 
SYNONYMS: 
Idmonea atlantica. Johnst. Brit. Zooph. ed. 2. 278. 
Gosse. Marine Zoology. 
Gray. Br. M. Rad. 141. 
Smitt. loc. eit. 398; 434. 
Busk. Ann. N. H. Ser. 2. XVIIl 34. 
Idem. Quart. Journ. Mier. sc. VI. 128. 
Idmonea radians. v. Beneden. Bryoz. de la Mer du Nord. Bull. 
Brux. XV]. pt. 2. 646. 
By reason of the delicate habit of the zoarium, the present spe- 
cimen may perhaps be considered as a form of transition to the 
variety „tenuis’ from the North Atlantic described by Busk. 
Lines and points on the dorsal surface very distinct. 
Number of zooecia in each series generally 3. 
Height about half an inch. 
One specimen only. 
