98 COLLINS AND HERVEY. 



sometimes the division proceeds no farther, but usually a vertical 

 division occurs in one of the halves, often in both, but in the latter 

 case the divisions of the two are seldom in the same plane. 



7. A. NEMALIONIS (De Not.) Borgesen, 1915, p. 55; Chantransia 

 Nemalionis Rosen vinge, 1909, p.- 126, figs. 53-54; Cattithamnion 

 Nemalionis De Notaris in Erb. Critt. Ital., No. 952. Harrington 

 Sound, April, Collins, growing on Tamarisk branches which had bent 

 down until submerged. As in A. Sagraeanum the erect filaments 

 arise from a plexus of irregular horizontal filaments, but in A. Nema- 

 lionis the latter emit descending filaments which penetrate the host. 

 In the Bermuda plant these are less developed than in the European 

 plant growing on Nemalion, probably on account of the more resisting 

 character of the substratum of Tamarisk, as compared with Nemalion. 



8. A. Thuretii (Bornet) comb. nov. ; Chantransia Thuretii Kylin, 

 1907, p. 119, fig. 28; C. efflorescens forma Thuretii Bornet, 1904, p. 

 XVI. On C odium decorticatum, Cooper's Island, Aug., Collins. 

 With monospores. 



9. A. HYPNEAE Borgesen, 1915, p. 51, fig. 54; Chantransia Hypneae 

 Borgesen, 1909, p. 2, fig. 2. On Ceramium clavulatum, in company 

 with A. crassipes, St. David's Island, Feb., Hervey. With mono- 

 spores. 



TRICHOGLOEA Kutzing. 



T. HERVEYI Setchell ms.; P. B.-A., No. 2034. In tide pools, 

 Gravelly Bay, March, April, Hervey; from low water mark to two 

 meters depth, near Cooper's Island, April, May, Collins. Extremely 

 gelatinous, not calcified. Appearing in March, but not found after 

 midsummer. 



HELMINTHOCLADIA J. G. Agardh. 



H. CALVADOSII (Lamour.) Setchell in P. B.-A., No. 2035; Dumontia 

 cahadosii Lamouroux in Duby, 1830, p. 941; Nemalion purpureum 

 Harvey, 1846-51, PI. CLXI; Helminthocladia purpurea J. G. Agardh, 

 1851, p. 414. Bailey's Bay, Feb., Castle Harbor, March, Wadsworth; 

 Dingle Bay, March, North Shore, April, Old Ferry Road, April, 

 Hervey; Tucker's Town, St. David's Island, Long Bird Island, April, 

 Collins. Specimens in Kemp herbarium, marked Helminthora divari- 

 cata and Helminthocladia divaricata both belong here. On stones 

 from half tide down, not uncommon in quiet water; antheridia and 



