ii8 Transactions of the Canadian Institute. [vol, ix 



of these characters are entirely neglected in descriptions of new species. 

 The final determination of their rank may be left until our knowledge of 

 all the species is such as to make revisions of the various families possible. 



Family — Perophoridae. 

 Perophora annectens Ritter. Proc. Cal. Ac. Sc, ser. 2, vol. IV, p. 37. 



In numerous colonies from Ucluelet the zooids differ from Ritter's 

 description only in being yellowish-orange instead of yellowish-green and 

 in having a maximum of 24 stigmata in a row instead of 18. These 

 differences seem unimportant. The individuals in all cases formed 

 typical social colonies and in no case were imbedded in a common test. 



Family — A gnesiidae. 



The genus Agnesia Mchlsn. should not be placed in the family 

 Corellidae {Corellinae) or Chelyosomatidae {Chelyosomatinae) , as has been 

 done by Michaelsen, Seeliger and Hartmeyer. The position of the in- 

 testinal canal on the left side of the pharynx is of major importance 

 and shows that its closest allies are the Cio?iidae and Phallusiidae. It 

 differs sufficiently from either of these groups to warrant its being placed 

 in a separate family. 

 Agnesia septentrionalis sp. n. 



Shape oval, laterally flattened. Dimensions of largest specimen, 

 15X11 X8 mm. Oral aperture terminal, atrial at anterodorsal angle. 

 Surface entirely sand-covered, sand adhering to filamentous processes 

 of the test. Apertures indistinctly 7- and 6-lobed respectively. 



Dorsal and ventral bands of transverse muscular fibres in addition 

 to the usual siphonal musculature. 



About 30 simple tentacles, varying in size, scattered over inner sur- 

 face of oral siphon. Dorsal tubercle apparently behind peripharyngeal 

 groove, its aperture transverse and slightly bent. Six very large dorsal 

 languets, with long 'roots.' No longitudinal bars. Transverse vessels 

 carry a number of large sickle-shaped processes. Stigmata forming 

 short infundibula, as many as three turns in each spiral; two rows of 

 infundibula between successive transverse vessels. 



Stomach large, smooth-walled. Intestine with the usual forwardly 

 directed loop on the left side of the pharynx. 



Ovary a rounded mass in the intestinal loop. Testicular lobes 

 scattered over the intestinal loop near the ovary. Gonoducts accompany 

 rectum. 



Collected near Stephen Island in 1906 by Rev. Mr. Taylor. 



This form differs from A. glaciata Michaelsen (Zoologica, Bd. 12, 

 Ht. 31, p. 6), the only other species described, in details concerning the 

 surface of the test, pharyngeal wall, &c. 



