C. montana; C. heterodonta; C. compacta, a1301; C. dicyclophora.

Descriptions of these are published in that order in the Transactions New Zealand Institute, vol. XXI, 1888, pp. 58–63.

Also C. involucrata, in Transactions, vol. XXII, 1889, p. 455.

The numbers opposite some of the names are those of the named duplicates in Colenso's collection.

C. epibrya Col., not seen, is reduced by Stephani in the Journal of the Linnean Society, vol. XXIX, 1892, to C. coalitus Nees.

C. spruceana Col., correctly reduced by Stephani to C. coalitus Nees.

C. ammophilus Col., a good species, already described.

C. vulcanicus Col., is a small form of Lophocolea leucophylla Tayl. Recognised as a new species by Stephani in the Linnean Journal, but later correctly reduced by him to Lophocolea.

C. marginata Col., not seen; reduced by Stephani to Lophocolea heterophylloides Nees.

C. venustula Col., not seen either by Stephani or myself, but from the description appears to be a small form of C. triacanthus (Tayl.)

C. insula Col., reduced by Stephani to C. ammophilus Col.

C. lingulata Col. This is apparently Lophocolea planiuscula Tayl. It was allowed by Stephani in the Linnean Journal, and is also in the Species Hepaticarum, but under the name of C. ligulatus. This is a common aquatic plant, apparently always sterile, of a dark, dingy, or blackish green, with crumpled leaves, which are lingulate entire, alternate, with small, free bifid stipules. Colenso complicates matters by describing a plant of another species, which as near as I can make out is C. normalis (St.).

C. epiphyta Col., is C. physanthus (Tayl.), wrongly reduced by Stephani to L. biciliata (Tayl.).

C. montana Col., not seen, reduced by Stephani to Balantiopsis diplophylla (Tayl.).

C. heterodonta Col., not seen either by Stephani or myself, but from the description is probably also B. diplophylla.

C. compacta Col., a good new species, already described. Stephani reduced it to C. coalitus Nees, but it is probable he did not have a good duplicate.

C. dicyclophora Col., reduced by Stephani to C. cymbaliferus (Tayl.).

C. involucrata Col., not numbered, but in the Colenso collection, is a species of Lophocolea of the Oppositae group, wrongly reduced by Stephani to L. biciliata (Tayl.). From his description in the Species Hepaticarum, Stephani appears to have had a wrong conception of the latter plant.

In conclusion, I would again express our thankfulness to the late Dr. Marshall Howe, of New York, for sending pieces from Mitten's Herbarium, without which this paper could not have been written. Our thanks are also due to the authorities of the Dominion and Hawke's Bay Museums, for making Colenso's material available, to Dr. H. H. Allan and Mr. V. D. Zotov, for the loan of the