NORTHUMBERLAND AND DURHAM. Dons 
authors with the S. polyzonias, from which it is distinguished 
by its more robust and rigid habit, and its compound stem. The 
cells also frequently assume a wrinkled appearance. The obser- 
vations in my Catalogue (v. iii., p. 111) on S. polyzonias apply 
more properly to this species. 
12. PLUMULARIA, Lamarch. 
9. P. HALEcIomDEs, Alder. 
Ald. in Ann. Nat. Hist., 3rd ser., v. iii., p. 353. 
Idem in Trans. Tynes. Club, v. iv., p. 177, t. xia. 
Since my former notice of this interesting zoophyte, it has 
been met with by Mr. Barlee in Shetland, and occasionally 
again on this coast, but it is by no means common. 
Famity. CAMPANULARIADA, Johnston. 
13, LAOMEDEA, Zamourouz. 
2. L. tonerssima, Pallas. 
In attempting to discriminate several species of Laomedea 
that had previously been confounded, I pointed out (Trans. T. 
C., v. il., p. 121) that the ZL. longissima (Pallas) had a denti- 
culated cell, while that of ZL. dichotoma is smooth. ‘The figure 
there given (t. v., f. 4), however, is erroneous, and was probably 
taken by mistake from a branched variety of Camp. Johnstoni. 
The crenulations of the cells in Z. longissima are shallow and 
truncated at the apex, as has been ascertained by Mr. Hincks 
from fresh specimens got on the Devonshire coast. I have since 
obtained young individuals with the same characters at Culler- 
coats. 
5. L. neeuecta, Alder. 
Thave lately met with a few individuals of this species, at 
Cullercoats, bearing ovicapsules. Mr. Hincks has ascertained 
that ‘the ova are developed into the perfect larval form within 
an external gelatinous marsuphium.” 
5*. L, Lovent, Allman. 
Allm. in Ann. Nat. Hist., 3rd ser., v. iv., p. 187. 
