310 REPORT 1868. 



Homer a violacea, Sars, Geel. og Zool. Jagtt. Reise Trondhj. St. Somm. 1862 

 (1863), p. 30 ; Smitt, Ofvers. af K. Vet.-Akad. F'orh. 1866, p. 404, 

 pi. vi. figs. 2-9. 



In general form like the last, but the back, instead of being striated, 

 is granulated ; the branches at their extremities with a rib-like eleva- 

 tion down the centre, the front having the cells more crowded and 

 much more produced than in borealis ; ovicells elongated, in the axils of 

 the branches, generally (in my specimens) with one part on the front, 

 but coming round the branch, the greater part lies on the back of the 

 polyzoary, with a very slight longitudinal riblet, otherwise smooth, and 

 closely punctate. Colour white with a violet tinge. In about 50 fa- 

 thoms, about seven miles E.S.E. from Balta, rare. Now first added to 

 cur fauna. 



Idmonea Atlantica, Forbes. Outer Haaf, 70-140 fathoms. 



serpens (Liim.)=Tubidipora serpens, Johnst. On Sertularia3, &c., com- 

 mon. 



Pustulipora deflexa (Couch). " Shetland, Peach, 1864 " (fide Alder in litt.). 



orchadensis, Busk, Quart. Journ. Mic. Sci. N. S. vol. viii. (1860) p. 214, 



pi. xxix. figs. 1, 2. " Shetland, Barlee" (Busk). The collection of the late 

 Mr. Barlee, which was bequeathed by him to myself, does not contain 

 any Polyzoon which I can identify as the type of this species described 

 by Busk. 



Tubidipora lobulata, Hassall. On stones, 30-70 fathoms. 



flabellaris, Johnst. " Shetland, Peach, 1864 " (fide Alder in litt.), 



Alecto granulata, M. -Edwards. Dourie Yoe and Haddock-grounds; also 

 Outer Haaf to 170 fathoms. 



major, Johnst. Common to 170 fathoms. 



dilatans, Johnst. 80-140 fathoms. Compared with the types in B. M. 



compacta, Norman, lleport Brit. Assoc. 1866 (1867), p. 204. On 



stones, Outer Haaf, Unst, and Out Skerries, in 80-170 fathoms. It is, 

 I believe, the Alecto dilatans, var., Johnston, p. 282, pi. xlix. figs. 7, 8. 



__ diastoporides, n. sp. Polyzoary lobulate, the branches diverging from 

 a common centre, and rapidly widening into fan-formed terminations, 

 appressed very flatly to stones or shells, closely punctate, but a 

 transparent looking line (the appearance caused by absence of punc- 

 tures) marking the course of each side of each concealed tube in a 

 similar way to the transparent lines in D. obelia ; cells scattered irre- 

 gularly, many being present on the expanded terminations ; mouth but 

 little raised above the crust, opening vertically. 



This is the largest Alecto in our seas, and a very marked species. It 

 is found on shell and stone, in 70-110 fathoms. 



Mr. Peach has also sent me the species from Wick, including a spe- 

 cimen nestling in a sheltered spot of the inside of a valve of Tapes vir- 

 f/inea, which has the cell-tubes erect and long ; in all other specimens 

 which I have seen they are very short. 



Diastopora obelia (Fleming). Down to 170 fathoms, common. 



Patinella patina (Lamk.). Common to 170 fathoms. 



Yar. prolifera, Busk, Crag Polyzoa, p. 114, pi. xix. fig. 1, and pi. xx. 

 fig. 3. Frequent on Cellepora cervicornis and Escliara Icevis. 



Discoporella liispida (Fleming). Common to 170 fathoms. 



Defrancia truncata (Jameson). Not uncommon on the Outer Haaf, in 70-170 

 fathoms. 



