44 



36. HIPPOTHOA HYALINA (Linnseus). Lepralia hyalina (Linn.) 

 Very common on roots and stems of Laminaria digitata and 



other Fuci, on stones, &c., between tide marks and in shallow water. 

 Alder (a). 



The Laminaria roots washed up by storms are very often almost 

 covered with this species. It has also been obtained from Stations 

 V. and VI. 



Ocecia. — September and October. 



37. BERENICEA PROMINENS, Lamouroux. Lepralia bron- 



gniartii (Audouin). 

 Rare. On a stone from deep water, Cullercoats. Alder (a). 



38.* HIPPOTHOA EXPANSA, Dawson, var. TRANSPARENS 



new variety. Plate II., Figs. 1, la, 16. 



A small colony of a species of Hippothoa has been found on 

 the stem of a Tubularian hydroid from 40 fathoms east of the Long- 

 stone. The Zocecia are uniserial but are not prolonged into a 

 narrow connecting fibre as in H. divaricata. The orifice in the 

 majority of the cells is orbicular, but in some there is a wide but 

 shallow sinus. The walls of the zocecia are hyaline, and not ribbed 

 or striated in any way. There is hi some of the cells a slight lateral 

 calcareous expansion. The ocecia are borne on an imperfectly 

 developed cell, which is attached to the side of a normal zocecium 

 by a short stalk. There are from two to four punctures in the 

 upper part of the ocecium. 



The species is, I think, referable to H. expansa, the only previous 

 British locality for which seems to be 100 fathoms off Unst, Shetland, 

 and which has been found on shells and stones. The lack of any 

 striation, the punctured ovicell, and wide shallow sinus seem, how- 

 ever, to entitle the specimen to rank as a new variety, for which I 

 propose the name transparent, as the walls of the zocecia and ocecia 

 are so clear that the polypide and embryo can be most distinctly 

 seen through them. 



39. HAPLOPOMA IMPRESSUM (Audouin). Lepralia granifera, 

 Johnston. 

 On slaty rocks, in front of the coves of Holy Island, and in 

 Berwick Bay. Johnstone. On Modiola vulgaris, between tide 

 marks at Bamburgh ; not rare. Alder (a). 



RETEPORID.E. 



