3802 REPORT—1868, 
pl. iti. figs. 6-10. Common among seaweeds in littoral and laminarian 
zones. 
Pachygnathus notops, Gosse, Ann. Nat. Hist, 2nd ser. vol. xvi, (1855) p. 304, 
pl. viii. figs. 1-4. Abundant on weeds in rock-pools, Balta Sound, 
1867, 
Clas TUNICATA, 
My entire collection of Tunicata having been placed in Mr. Alder’s 
hands for use in the preparation of the work which, in conjunction with 
Mr. A. Hancock, he had undertaken for the Ray Society, and which will be 
shortly published, the nomenclature of the following list may be relied upon. 
Species of Botryllus, Botrylloides, and allied genera are numerous in Shet- 
land, but it being impossible to preserve them satisfactorily, and not having 
works with me, I was unable to identify more than two or three species 
with any degree of certainty, and have thought it better therefore entirely 
to omit these genera in the present Report, and leave them for some future 
investigator to work out. 
Pelonaia corrugata, Forbes & Goodsir, A single small specimen off the 
Island of Balta. 
Ascidia intestinalis, Linn, At low water, West Voe, Whalsey Skerries, and 
Lerwick. 
venosa, Miller. Middle Haaf, off Out Skerries, 40-50 fathoms; also 
Haroldswick Bay. 
mentula, Miller, Middle Haaf. 
rudis, Alder, Ann. Nat. Hist. 1863, vol. xi. p. 155. The type specimens 
were taken at low-water mark near the Whalsey Lighthouse, Out 
Skerries, 1861. 
— obliqua, Alder, Ann. Nat. Hist. 1863, vol. xi. p. 154, The type spe- 
cimens were dredged in 40-50 fathoms on the Outer Haaf, due east of 
Whalsey Lighthouse, in 1861 ; also several fine examples, in about the 
same depth of water, between the islands of Whalsey and Balta, 1867. 
sordida, Alder & Hancock. 50-80 fathoms, and common. In most 
extraordinary profusion, on sandy ground, 7-10 miles east of the Isle 
of Balta, in company with Zubularia gracilis, Eudendrum, Zoanthus 
papillosus, which all occur in greater quantity in that locality than 
elsewhere in Shetland. In one spot the dredge came up again and 
again literally filled with A. sordida. 
virginea, Miller. “Zetland, R. M‘Andrew & E. Forbes” (Forbes & 
Hanley). It is probable that the last species is meant. 
paralleogramma, Miiller. Apparently rare, one specimen only, 10 
miles east of Balta. 
depressa, Alder & Hancock. Low water, Island of Housay, in company 
with the following species. 
scabra, Miller. Island of Housay (Out Skerries), in the West Voe, 
spring tides, common. 
elliptica, Alder & Hancock. Low water, Lerwick, 1861. 
—— plebcia, Alder, Ann. Nat. Hist. 1863, vol. xi. p.155. Forty miles east 
ot Whalsey Lighthouse, 1861, the type specimens. 
Melgula arenosa, Alder & Hancock; Alder, Ann. Nat. Hist. 1863, vol. x1. p. 
160; Molgula tubulosa, Forbes & Hanley, vol. i. p. 36 (but not A. 
tubulosa, Miller). Common on the Haddock-grounds between Whalsey 
and Feltar; east of Balta; St. Magnus Bay, &c. : 
