MOLLUSCOIDA. 53 



Family Botryllidae. 

 Genus Leptoclinum, M. Edwards. 



LeptocUnum 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 Botryllus, Gartner. 



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 poly cyclus, 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 Fleming <ii, Alder, Ann. & Mag. Nat. Hist. 

 1863, xi. p. 172. 



[Plate IX. fig. 3.] 



Occasionally on laminarian roots near low water. Mr. 



