292 Transactions. — Zoology. 



form. Lips entire, contracted by a joint where they join hydrorhiza. Spores 

 arranged in several spiral rows around blastostyle. 



Habitat. — Fuci, one to three fathoms, Timaru ; delicate seaweeds; growing 

 from roots of Laminarians. 



This species well illustrates what I have noticed in other species, that 

 there is a sensible difference in size, even in same species, in those I have got 

 on southern beaches as contrasted with those got on eastern beaches, the latter 

 being by far the largest. Figs. 46 — 49. 



Greene, in Manual of Ccelenterata, p. 128, mentions that there is a species 

 of Cryptolaria (a Sertularian) found in New Zealand, other members of this 

 genus being found in Madeira. 



I have collected a few more species than I have had time to describe, but 

 I hope to contribute on the same subject to next year's Transactions. 



Description of Plate XX. 

 Note. — All objects magnified 50 diameters, except where otherwise specified. 

 Fig. 1. Sei'tularia joJinstonii. Typical specimen, a and &, different views 

 of the hydrothecse. 



2. Variety oi Sertularia Johns tonii, possessing the oblique joint. 



3, 4, and 5. Different forms of gonangiums of Sert. johnstonii. 



6. Position and form of hydrothecse on secondary branches of S. 



monilifera. 



7. Gonangium of same. 



8. Sertularia sim2)lex. Type. 



9. A variety of S. simplex. Shows its relation to aS'. polyzonias. 



10. Another var. of >S^. simplex. Shows still better the relations of this 



species to aS'. polyzonias. 



11. Gonangium of aS'. simj!?Zea/\ Type. 



12. Part of a ramule of S. ramulosa, showing hydrothecse and 



gonangium. 



1 3. Habit and genei'al form of Sertularia ramulosa. Half nat. size. 



14. Sertularia trisinnosa. Fig. 1 6 gives form of gonangium. 



15. a, one of the varieties of S. trisjmiosa ; b, the second variety of 



S. trisinnosa j this shows well its plumularian habit. Half 

 nat. size. 



IG. Gonangium common to Sert. trispinosa^ Sert. bispinosa, and Sei't. 



abietinoides. 



17. Portion of hydrocaulis of S. bispinosa. Gonangium shows the 



stunted process mentioned in the text. 



18. Sertularia abietinoides, a pinna magnified. 



19. Profile view of gonangium common to Sert. ti'isjyinosa, Sert. 



bisjnnosa, and Sert. abictiiioidee. 



