NORTHUMBERLAND AND DURHAM. 131 



nearly on a line with each other. Height one to two 

 inches. 

 From the deep-water fishing boats ; rather rare. 

 Tliis species comes very near to the Grammaria rohusta of 

 Stimpson,* of which it may possibly be a variety, the principal 

 difference being that the British form is always much branched, 

 while the American species is linear and straight. The genus 

 is new to Europe, and does not appear to differ much from the 

 Salacia of Lamouroux, founded on an Australian species. 



17. COPPINIA, Hassall. 

 1. C. ARCTA, Daly ell. 



Sertularia arcta, Daly. Rare and Remark. Anim. Scot., 



V. 1, p. 224, t. xlii. 

 Coppinia mirahih's, Hassall in Zoologist, No. 69, 

 p. 2223. Trans. Micros. Soc, v. 3, p. 160, 

 t. xxi., f. 1, 2. 

 Parasitical on the stems of Sertularia dbietina and Plumu- 

 laria falcata ; frequent. 



Family. HYDRIDE, Johnston. 

 18. HYDRA, Linnceus. 



1. H. VIRIDI8, Linn. 



Johns. Brit. Zooph., 121, wood-cut 28. 

 In ponds and still waters ; common. 



2. H. VULGARIS, Pallas. 



Johns. Brit. Zooph., 122, t. xxix., f. 2. 

 Hancock in Tynes. Club. Trans., v. 1, p. 405, 

 t. vii.? 

 In ponds, &c. ; rather rare. In a pond near North Elswick. 

 — J. A. Crag Lake. — A. Hancock, Esq. In a stream 

 of clear water at Norton. — J. Hogg, Esq. 



* Synopsis of the Marine Invertebrata of Grand Manan, p. 9, t. i., f. S 



