ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 311 
Suborder CrmnosroMATA. 
Aleyonidium gelatinosum (Pallas), 40-50 fathoms, 5-8 miles east of Balta, 
sandy bottom, with immense quantities of Hydrozoa and Tunicata; also 
40 fathoms, six miles north of Whalsey Lighthouse. 
—— hirsutum (Fleming). On Fuci, tide-marks, Balta Sound, and Out Sker- 
ries, abundant. 
——? A third species was found by me in 1861 between tide-marks, West 
Voe, Out Skerries. Mr. Alder, who examined it for me, gaye me the 
MS. name for it, “ Aleyonidiwm radiatum.” 
Arachnidia hippothooides, Hincks, Cat. Zoophytes Devon and Cornwall, p. 57, 
pl. xvi. fig. 2. Creeping over the test of Ascidia sordida; dredged 
5-8 miles off Balta. 
Flustrella hispida (Fabr.)=Flustra hispida, Johnst. Brit. Zooph. p. 2638, 
pl. lxvi. fig. 5, = Flustrelia hispida, Gray, Brit. Radiated Anim. Brit. Mus. 
p. 108; Redfern, Quart. Journ. Mic. Sa. N.S. vol. vi. 1858, p. 96, 
pl. iv., =Alcyondium hispidum, Smitt, Ofvers. af K. Vet.-Akad. Forh. 
1866, p. 499, pl. xii. figs. 22-27. On Fuci, Chondrus, and other sea- 
weeds; common. 
Vesicularia spinosa (Linn.). “Shetland, 1858, Barlee” ( fide Alder in litt.). 
Buskia nitens, Alder, Cat. Zooph. Northumb. and Durham, p. 66, pl. v. 
figs. 1, 2; Quart. Journ. Mic. Sci. N.S. vol. v. 1857, p. 24, pl. xiii. 
figs. 1,2. “On Halectum labrosum, procured by Mr. Barlee” (Alder 
in litt.). ¢ 
Valkeria cuscuta (Linn.). Procured in 1861, 
Bowérbankia imbricata (Adams). Tide-marks, common, 
Avenella fusca, Dalyell, Rare and Rem, Anim, Scot. vol. il. p. 65; vol. i. 
pl. xii. fig. 11; Alder, Cat. Zooph. Northumb. and Durham, p. 69, = 
Farrella fusca, Busk, Quart. Journ. Mic. Sci. vol. vi. fig. 3, = Farrella 
dilatata, Hincks, Quart. Journ. Mie. Sci. vol. viii. p. 279, pl. xxx. fig. 7; 
Cat. Zooph. Deyon and Cornwall, p. 30. Parasitic on the tests of 
Ascidians from deep water. 
Suborder Prprceriiyea. 
Pedicellina Belgica, Yan Ben. Recognized by Mr. Alder on some Shetland 
Hydrozoa sent to him in 1861. 
gracilis, Sars. On Sertularia, 1863; rare. 
echinata, Sars. ‘In Dourie Voe, 15 fathoms, 1864” (fide Peach). 
Suborder Lopopnra. 
I have pleasure in announcing the discovery in the Shetland seas of a 
species of this interesting tribe, which up to the present time has been 
supposed to embrace only freshwater forms. Rhabdopleura was dredged by 
me in the Outer Haaf, and being unable to recognize it, I sent it to Pro- 
fessor Allman for his opinion, and the extract from a letter received from 
him, given below, will show the result of his examination. 
Rhabdopleura Normani, Allman, nov. gen. et sp. “ Now with regard to the 
new genus. Expecting nothing but hydroids in your bottles, and being 
satisfied on a rapid glance that the contents of one bottle were some- 
thing very different from any known hydroid, I at once set the specimen 
down in my mind as that of a new genus of Campanularians. I now 
» find that it is no hydroid, but a very curious and new genus of Polyzoa. 
So interesting a form is it that I thought it worth while spending some 
