ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 321 
Order GYMNOCHROA. 
Hydra viridis, Linn. In ponds and weedy lakes. 
Order THECAPHORA. 
Hydrallmania falcata (Linn.). 
Plumularia pinnata (Linn.). 
helecioides, Alder. Found by Mr. Barlee in 1858 (fide Alder, Ann. Nat. 
Hist. Feb. 1860, in note under Camp. fastigiata). 
setacea (Ellis). Not common. 
Catharina, Johnston. In great abundance, 40-73 fathoms, 5-10 miles 
east of Balta ; also Dourie Voe, &c. 
frutescens (Ellis & Sol.). Frequent, but the specimens usually small, 
Middle and Outer Haafs, 40-80 fathoms. 
Aglaophenia myriophyllum (Linn.). Not uncommon, and often very fine. 
Antennularia antennina (Linn.). Rare in Shetland, while the next is 
common. 
ramosa (Lamx.). 
Thwaria thwa (Linn.). Frequent in about 40-50 fathoms. 
articulata (Pallas). Rare, Middle Haaf. 
Sertularella Gayi, Lamx. Common, Middle Haaf. 
polyzonias (Linn.). Common. 
tenella (Alder), Parasitic on Tubularia indivisa. 
—— rugosa (Linn.), Creeping on sponges, tide-marks, abundant in Halse 
Hellyer, Burrafirth. 
Diphasia rosacea (Linn.). Off Balta Sound, and in the Burrafirth caves. 
alata, Hincks. Dredged one mile north of Whalsey Lighthouse, 40 fa- 
thoms, and also to the north of Unst. 
pinaster (Ellis & Sol.) ¢ =S. Margareta, Hassall 9. Common in 40- 
80 fathoms. 
tamarisca (Linn.). Frequent, 40-90 fathoms. 
fallawz (Johnston). Rare, 1861. 
Sertularia pumila, Linn. At low water, common on Fuci. 
abietina, Linn. 
—— filicula, Ellis & Sol. “Barlee, 1858” (fide Alder in litt.) ; « 50-100 fa- 
thoms, rare, Out Skerries and Unst, 1864 ” (Peach in htt.). 
—— gracilis, Hassall. Found in 1861, the exact habitat forgotten. 
operculata, Linn. 
argentea, Ellis & Sol. Lerwick Sound, and off Balta. 
—— cupressina, Linn. Balta Sound and Burrafirth caves, not common, and 
small, 
Halecium halecinum (Linn.). 
Bean, Johnston. Frequent. 
—— lubrosum, Alder. A fine specimen procured by Mr. Barlee in 1858, and 
again taken by myself in 1861, in deep water, to the north of Unst. 
—— muricatum (Ellis & Sol.). A fragment procured by me in 1861 off 
Unst, and submitted to Mr. Alder, was thought by him to be referable 
to this species, although, as it did not bear any gonophores, some doubt 
attaches to the identification. 
Salacia abietina (M. Sars) = Grammaria ramosa, Alder. The genus Salacia, 
Lamx., takes precedence of Grammaria, Stimpson. 
Frequent, 40 fathoms, Middle Haaf, and a little to the north of 
Whalsey Lighthouse, 
