306 REPORT 1868. 



Alysidota Alderi, Busk, Quart. Journ. Mic. Science, N. 8. vol. iv. (1856) 

 p. 311, pi. ix. figs. 6, 7, =Lepralia Barleei, id. ibid, vol.viii. (1860)p.l43, 

 pi. xxvi. figs. 1, 2. Common, 50-170 fathoms. In its chain-like form 

 it is the Alysidota Alderi, and when living in groups Busk's Lepralia 

 Barleei. The two varieties are occasionally found passing into each 

 other. The type specimens of both are in my collection. 



Lepralia Brongniartii (And.). 40-100 fathoms, frequent. 



reticulata, Macg. Hare, 80 fathoms. 



crystattina, Norman, Eeport Brit. Assoc. 1866 (1867), p. 204. On 



shells and stones, 80-140 fathoms. 



auriculata, Hassall. To 100 fathoms. 



concinna, Busk, 40-170 fathoms. 



bella, Busk, Quart. Journ. Mic. Sci. N. S. vol. viii. (1860) p. 144, 



pi. xxvii. fig. 2. A fine species, abundant on large stones on the Outer 

 Haaf, to 170 fathoms. 



sinuosa, Busk, Quart. Journ. Mic. Sci. N. S. vol. viii. (1860) p. 125, 



pi. xxiv. figs. 2 & 3. On stone and shell, Outer Haaf. 



verrucosa (Esper.). Tide-marks and shallow water. 



cruenta, Norman, Ann. Nat. Hist. 3rd ser. vol. xiii. 1864, p. 88. Hare, 



80-100 fathoms. 



spinifera, Johnst., Busk, Cat. Marine Polyzoa, p.69,pl.lxxvi.figs.2,3(but 



not the other figures referred to at p. 69). On stones and roots of Lami- 

 narise, tide-marks and shallow water, Balta Sound, Hillswick, and Ler- 

 wick. 



unicornis, Johnst., ==L. ansata, Busk, Crag Polyzoa, p. 45, pi. vii. fig. 2. 



Mr. Busk appears to me to have transposed the names of this and the 

 following species. "What I consider to be the true unicornis is the 

 species evidently referred to by that name in the 'Catalogues' of Alder 

 and Hincks. It is common between tide-marks. 



< ansata, Johnston, =L. unicornis, Busk, Crag Polyzoa, p. 45, pi. v. fig. 4. 



This species is distinguished from the last by its short and very broad 

 cells, and by the much smaller size of its ovicells. It is a deep-water 

 form, and is extremely abundant in the Shetland seas, in 40-170 

 fathoms. "Whether this is really a distinct species from L. unicornis is 

 perhaps doubtful. 



trispinosa, Johnston. Found down to 170 fathoms. A pretty variety 



coating a Ditrupa, has the punctures round the margin more conspi- 

 cuous than usual, an avicularium on the front of the cell in the centre, 

 with its mandible pointing directly downwards, and the ovicell cleft 

 with wedge-shaped openings, which radiate from the sides towards the 

 centre. 



coccinea, Abildgaard. Abundant between tide-marks and in shallow 



water. 

 Ballii, Johnston. On shells, 30-50 fathoms. 



linearis, Hassall. Common down to 170 fathoms. 



Var; 1. hastata, Hincks, Cat. Zoophytes Devon and Cornwall, pp. 46 

 and 63, pi. xii. fig. 4. On Cellepora cervicornis, off the Island of Balta. 



Yar. 2. crucifera. With the usual avicularia on each side of the cells, 

 and with a central, suboral process rising from the cell in the form of a 

 very long, gradually tapering, rugose, perpendicular spine, which is more 

 than equal the length of the entire cell, and in its most perfect state 

 gives off a branch at nearly right angles at rather more than half its 

 height, so that the whole process is in the form of a cross or trident. 



