302 BEPORT 1868. 



pi. iii. figs. 6-10. Common among seaweeds in littoral and laminarian 

 zones. 



Pachyynatlms notops, Gosse, Ann. Nat. Hist. 2nd ser. vol. xvi. (1855) p. 304, 

 pi. viii. figs. 1-4. Abundant on weeds in rock-pools, Balta Bound, 

 1867. 



Class TUNIC ATA. 



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 B-ay 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 lleport, and leave them for some future 

 investigator to work out. 



Pelonaia corrugata, Forbes & Goodsir. A single small specimen oif the 

 Island of Balta. 



Ascidia intestinatis, Linn. At low water, West Yoe, Whalsey Skerries, and 

 Lerwick. 



venosa, Miiller. Middle Haaf, oif Out Skerries, 40-50 fathoms ; also 



Haroldswick Bay. 



mentula, Miiller. 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 Tubularia 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, Miiller. " Zetland, B. M'Andrew & E. Forbes" (Forbes & 



Hanley). It is probable that the last species is meant. 



parallelogramma, 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. 



scdbra, Miiller. Island of Housay (Out Skerries), in the West Yoe, 



spring tides, common. 



elliptica, Alder & Hancock. Low water, Lerwick, 1861. 



plebeia, Alder, Ann. Nat. Hist. 1863, vol. xi. p. 155. Forty miles cast 



of Whalsey Lighthouse, 1861, the type specimens. 



Molgula arenosa, Alder & Hancock ; Alder, Ann. Nat. Hist. 1863, vol. xi. p. 

 160 ; Molcjula tubulosa, Forbes <fc Hanley, vol. i. p. 36 (but not M. 

 tubulosa, Miiller). Common on the Haddock-grounds between Whalsey 

 and Feltar ; east of Balta ; St. Magnus Bay, &c. 



