NORTHUMBERLAND AND DURHAM. 121 



Family. CAMPANULARIAD^, Johnston. 



13. LAOMEDEA. Lamouroux. 

 *Cells cup-shaped. 



1. L. dichotoma, Linn. 



Laomedea didLOtoma, var. «, Johns. Brit. Zooph., 



102, t. xxvi., f. 1, 2. 

 Campamdaria gelatinosa, Van. Ben. Campan., 33, 

 t. i., ii. 

 In pools between tide-marks, Bamborough ; rather rare. 

 South coast of Durham — J. Hogg, Esq. 

 It has become necessary to divide the L. dkliotoma of John- 

 ston into two species, distinguished by the character of their 

 cells. Those of his var. u, which I take to be the true dicho- 

 toma of Linn^us, and the " Sea-thread coralline" of Ellis, PI. xii., 

 a. A, and PI. xxxviii., fig. 3, has the cells rather wide, with a 

 plain margin : this kind is found between tide marks, and appears 

 to be the species represented by Dr. Johnston in his PI. xxvi., fig. 



2. It is common in some parts of the south of England, and is 

 particularly abundant at Tenby; but, as far as my experience 

 goes, it is rare in the north. I have only met with it once on 

 our coast, and of small size. Dr. Johnston's remark, that it is 

 common within tide-mark, would, however, appear to imply 

 that he found it so in Berwick Bay. What he got on branches 

 of trees, that had been washed into the sea, probably belonged 

 to the next species. The fishermen of our coast frequently 

 bring in branches of trees, fished up in deep water, covered with 

 barnacles and zoophytes, among which L. longissima is not 

 uncommon. 



2. L. longissima, Pallas. 



Sertularia longissima, Pallas, Elench. Zooph., 116, 



No. 67. 

 Laomedea dichotoma, var. /3, Johns. Brit. Zooph., 102. 

 In deep water; frequent. 

 Tlie species of Laomedea, in many of their characters, come so 

 near to each other that it is difficult to distinguish them. This 



