NORTHUMBERLAND AND DURHAM. 127 



18. Couch, Comisli Fauna, pt. 3, 40, t. xi., f. 1. Gosse, 

 Ranib. Dev. Coast, 296, t. xviii. 

 On sea-weeds, zoophytes, shells, &c., from hetween tide- 

 marks to deep water ; common. 

 This species is of more robust growth than the last, with the 

 cells larger and more strongly denticulated ; they are also 

 wider, but this character is rather variable in both species. The 

 pedicles are longer and stouter, and have always numerous close- 

 set rings at the base, and also several rings at the top; the 

 middle part is variable, sometimes partially or even wholly 

 ringed, but more frequently plain. There is sometimes a joint 

 in the pedicle, in which case it is ringed* above. The creeping 

 fibre is always plain, and seldom, if ever, detached. The ovi- 

 capsules are large, ovate or sub-cylindrical, more or less elongated, 

 with a truncated top, and very strongly plicated transversely. 

 They rise from the creeping stem by scarcely perceptible pedi- 

 cles. Mr. Gosse has represented a spur at the bottom, which I 

 have not observed. 



It may be a question for future solution whether this species 

 is ever branched. I have found branched specimens from deep 

 water very much resembling this, with a ringed base to the stem 

 and a strongly denticulated cup, which I believe to be the young 

 of Laoinedea longissima, having found specimens a little more 

 advanced with the capsules of that species. In Ellis and Solan- 

 der's " Zoophytes," however, a figure is given of a branched 

 specimen under the name of Sertularia voluhilis, with capsules 

 resembling those of C. Johnstoni. 



3. C. HiNCKsii, n. sp. PI. IV., fig. 9. 



Stem creeping, plain: pedicles long, nearly smooth, with 

 two or three slight spiral twists at the base, and two or 

 three spherical rings at the top, one of which is within 

 the cup: cells rather long, with parallel sides, wrinkled 

 or lineated longitudinally; marginal denticles 10, of a 



* It is important in this genus to distinguish between rings, with lines returning into 

 themselves, and spiral ridges, as the distinguishing characters of the species often depend 

 upon them. 



VOL. III. PT. II. Q 



