ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 309 



tomously dividing), and round. Placed side by side with Cornish spe- 

 cimens this looks very different, but the microscopic characters appear 

 to be identical. 



Palmicellaria elegans, Alder, Quart. Journ. Hie. Sci. vol. iv. (1864) p. 100, 

 pi. ii. figs. 1-4. A beautiful little species, 80-110 fathoms, eighteen to 

 twenty-five miles 1ST. and N.N.W. of Burrafirth Lighthouse. 



Tessaradoma gracile (Saxs) = Pustuliporagracilis, Sars, Keise Lof. Finm. 1850, 

 p. 26, = Quadricellaria gracilis, Sars, Beskr. Norske Polyz. p. 15 ; Alder, 

 Quart. Journ. Mic. Sci. vol. iv. (1864) p. 101, pi. ii. figs. 9-12, = OncJw- 

 pora borealis, Busk, Quart. Journ. Mic, Sci. N. S. vol. viii. (1860) p. 213, 

 pi. xxviii. figs. 6, 7, =Anarihropora borealis, Smitt, Ofvers. af K. Vet.- 

 Akad. Forh. 1867, Bihang, p. 8, pi. xxiv. figs. 25-29. Eather local, but 

 not rare on the Outer Haaf. It is necessary that the generic name Qua- 

 dricellaria, which is preoccupied, should be changed. Smitt has insti- 

 tuted a genus Anarihropora to receive Lepralia monodon and the present 

 species ! Such a union, in my opinion, cannot stand. Leaving, there- 

 fore, L. monodon as the type of Smitt's genus, I propose the name 

 Tessaradoma, the characters of which will be those given by Alder, I. c. 

 I have not adopted the genus .Anarihropora for L. monodon in this 

 Eeport, because an entire rearrangement of the Membraniporidee is re- 

 quired, and until that entire rearrangement is carried out (and this I 

 hope shortly to do), I have thought it better not to partially dismember 

 the genus Lepralia. 



Hemeschara struma, Norman, Quart. Journ. Mic. Sci. vol. viii. (1868) p. 221, 

 pi. vii. figs. 6-8. In 100 fathoms, about twenty-five miles north of Unst, 

 attaching itself to stones and the branches of C. cervicornis, and running 

 out into free expansions. 



Escliara Landsborovii (Johnst.) , Alder, Quart. Journ. Mic. Sci. vol. iv. (1864) 

 p. 105, pi. iv. figs. 1-3. Very rare ; the Lepralian state on a stone from 

 170 fathoms. 



Icevis (Fleming), Alder, Quart. Journ. Mic. Sci. vol. iv. (1864) p. 102, 



pi. iii. figs. 8-11. Scarce, in about 100-170 fathoms, 20-25 miles N. 

 and N.N.E. of Unst. 



Skenei (Ellis and $ol.)=Cellepora Skenei, Busk, Marine Polyzoa, p. 88, 



pi. cxxii. 40-70 fathoms, 5-10 miles east of Balta ; also Out Skerries 

 Haaf. 



lorea, Alder, Quart. Journ. Mic. Sci. vol. iv. (1864) p. 104, pi. iii. figs, 5-7. 



80-100 fathoms, 20-25 miles north of Burrafirth Lighthouse. Certainly 

 distinct from the last, with which it is united by Smitt. 



Retipom Beaniana, King. Occasionally on the Unst Haaf, doAvn to 170 

 fathoms ; abundant on the Out Skerries Haaf, but not so large as on the 

 Northumberland coast. 



Suborder CYCLOSTOMATA. 



Crisla eburnea (Linn.). On Hydrozoa on haddock-grounds. 



Yar. producta, Smitt, Ofvers. af K. Vet.-Akad. Forh. 1865, p. 116, 



pi. xvi. figs. 4-6. On stones, 100-170 fathoms. 



denticulata (Lamk.). On Zoophytes, Haddock-ground. 



acideata, Hassall. " Tide-marks to Haddock-ground " (Peach, 1864) ; 



" Shetland, Barlee" (fide Alder in litt.). 

 Crisidici cornuta (Linn.). On rocks between tide-marks. 

 Hornera lorealis, Busk, Alder, Quart. Journ. Mic. Sci. vol. iv. (1864) p. 108, 



pi. iv. figs. 1-6. 80-170 fathoms, Outer Haaf. 



