MOLLUSCOIDA. 
53 
Family Botryllidse. 
Genus Leptoclinum, M. Edwards. 
Leptoclinum durum, M. Ed.; Forbes & Hanley, Brit. Mollusca, 
i. p. 17 (as L. aureum, a misprint). 
Common under stones in rock-pools between tide-marks. 
Dull yellowish white, with white specks from stellate cal¬ 
careous crystals. 
Leptoclinum punctatum, Forbes; F. & H. Brit. Moll. i. 
p. 18. 
Not uncommon under stones between tide-marks. 
Genus Botkyllus, Gsertner. 
Botryllus Schlosseri , Pallas; F. & H. Brit. Moll. i. 
p. 19, pi. A. fig. 7, pi. B. fig. 7. 
Occasionally under stones between tide-marks. The red 
spot in the centre is not very visible in these specimens. On 
tearing, a dark brownish digestive system appears. 
Botryllus polycyclus, Sav.; F. & H. Brit. Moll. i. 
p. 21. 
Frequent near low-water mark on the under surface of 
stones, on Fuci and Corallina officinalis. 
Genus Botrylloides, M. Edwards. 
Botrylloides Leachii, Sav.; F. & H. Brit. Moll. i. p. 23. 
Common in the laminarian region attached to seaweeds. 
Numerous other species of Botrylloides and a Didemnum are 
common under stones in the rock-pools. 
Genus Parascidia, Alder. 
Parascidia Flemingii, Alder, Ann. & Mag. Nat. Hist. 
1863, xi. p. 172. 
[Plate IX. fig. 3.] 
Occasionally on laminarian roots near low water. Mr. 
