198 



REPORT 1875. 



Hydrozoa. 



Hydractinia echiuata {Fleming), 

 Eudendrium ramosum {Linn.}. 

 Tubularia indivisa, Liim. 



coronata, Abildc/aard. 



Clytia Jolinstoni (Alder). 

 Obelia geniciUata {Linn.). 



longissima (Pallas). 



Campanularia Hincksii, Aider. 



verticillata (Linn.). 



Lafoea dumosa (Fleming). 



pocillum, Ilincks. 



Calycella syriuga (Linn.). 

 Filellum serpens (TIassall). 

 Coppinia arcta (Dalyell). 

 Halecium halecinum (Linn.). 

 Beanii, Johnston, 



Sertularella polyzoaias (Linn."). 



tenella, Alder. 



Dipliasia rosacea (Linn.). 



attenuata, Hincks, 



fallax (Johnston). 



tamarisca (Linn.). 



Sertularia tilicula, Ellis 8i Sol. 



abietina, Linn. 



fusca, Johnston. 



Hydrallmania falcata (Linn.). 

 Thuiaria articulata (Pallas). 



tliuia (Linn). 



Plumularia pinnata (Linn.). 



■ setacea (Ellis). 



Catharina, Johnston. 



— frutescens, Ellis <§• Sol. 



Spongozoa. 



Grantia ciliata, Johnston. 

 Polymastia robiista, Bo^v. 



mamillaris (Johnston). 



Microciona iictitia, Bote. 

 Hymeniacidon coccineus, JBoiu. 

 virgulatiis, Boxc, n. sp. 



Hj'meniacidon ficus (Johnston). 

 Ilalichondria panicea, Johnston. 



virgea, Bore, n. sp. 



Isodictya liirida, Boiv. 

 Spongionella pulcliella (Sowerby). 



Among the Polyzoa is Bitgula fnitieosa of Packard*, first described by 

 Packard from Labrador, and subsequently by Smitt from Spitsbergen and 

 Finmark, but not previously found in our seas. I entirely agree with Smitt 

 in considering it to be a form, though a very interesting one, of Bugula 

 Murrayana, It differs from the ordinary state of that species in being more 

 delicate in structure, the branches and branchlets much narrower, commonly 

 with only one or two rows of cells, and the cells armed with only few spines, 

 typically one only at the superior and outer angle. 



The Hydrozoon Lafoea jjociUum, Hincks (Hist. Brit. Hydr. Zooph. p. 204, 

 pi. xi. fig. 2), is a recently described species, which has not previously been 

 found on the cast coast. Its known habitats were Labrador and Oban. 



Two Sponges are pronounced by Dr. Bowerbank to be undescribed, and 

 subjoined will be found descriptions which have been drawn up by that 

 gentleman. He has named the species Hymeniacidon virguJatus and HaU- 

 chondria virgea, 



" Halicliondria virgea, Bowerbank, n. sp. 



" Sponge massive, sessile, more or less nodulous. Surface smooth. Oscula 

 simple, dispersed. Pores inconspicuous. Dermal membrane abundantly spi- 

 culous ; tension-spicula acuate, very long and slender, numerous, fasciculated ; 

 retentive spicula bidentate, equianchorate, large, few in number, and the 

 same form, small and numerous. Skeleton — rete more or less regular; fibres 

 rarely multispiculous, seldom more than trispiculous ; areas large ; spicula 

 subfusiformi-acuate, basally spinous. Interstitial membranes spiculous ; 

 spicuise same as those of the dermis; tension-spicula of rare occurrence; 

 retentive spicula rather numerous. 



* Menipea frvticosa, Packard, List of Labrador Marine Animals, p. 9, pL i. fig. 3, = 

 Cellularia quadridentata, Lor^n, MS. 1834 (fide Smitt), —Bv.gula Murrayana forma quadri- 

 dentata, Smitt, Kritisk Forteckning ofver Skandinaviens Hafs-BrTOZoer, p. 292, pi. r\'iii. 

 figs. 23-27. 



