SUPPLEMENT. 169 



Habitat : Shetland ; a small valve in a mass of Lopliohelia 

 prolifera (Dr. Edmondston) ; N. of Hebr., 189 and 650 f. (C. 

 andT.). F. Messina (Seguenza) ! E. Norway and Sweden, 

 30-300 f. (Spengler and others); Naples and Sicily (Acton 

 andAradas)! P. Gemellarii-jilii, Biondi, MS., /. Bernardi. 

 Chemnitz seems to have included P. striatus in his description 

 and figures b, c. P. abyssoiwm, Loven, MS., is a smooth variety. 



P. 73. — P. maximus. F. Sweden and Italy. E. Spain, 

 from 4 f. downwards (Hidalgo). 



P. 78. — Lima Sarsii. W. coast of Shetland, a single valve; 

 N. of Hebr., 170 and 189 f. (C. and T.). F. Sicily and Rhodes ! 

 E. Loffoden I., 300 f. (Sars). Probably L. (Limatida) crassa 

 of Forbes, from the JEgean, 105-230 f. ; but his description 

 is too short, and he does not notice the transverse or concentric 

 strias. 



P. 81. L. ELLIPTICA. 



Body whitish, with a faint tinge of orange : mantle fringed 

 with several tentacles of different lengths ; these are cylindrical 

 when fully extended, but conical and thick when contracted, 

 and are closely ringed ; in the young they are white, and in 

 the adult tipped with lemoncolour or pale yellowish-brown ; 

 the tentacles are arranged in three rows, of which those on the 

 outside are the smallest and shortest, the innermost being the 

 longest : foot dibble-shaped and pointed, the inner portion or 

 core being pale orange and enclosed in a clear gelatinous case ; 

 it is folded inwards, so as to make a groove ; the heel or bys- 

 siferous part of this organ is rather prominent : gills horn- 

 colour, in 2 nearly equal-sized pairs. 



One of my largest specimens moored itself to the side of a 

 glass vessel in which it was kept, by two threads as fine as 

 any that spiders spin ; and it was thus held suspended in the 

 water. It afterwards warped itself up by applying the point 

 of its foot to the glass, and step by step repeating the process. 

 N. of Hebr., 170 and 189 f. (C. and T.). F. Coralline Crag. 

 Antwerp, Norway, Italy, and Rhodes! E. Loffoden I., 3001'. 

 (Sars); Med., Adr., andiEg. ! The young may be L. (Lima- 

 tula) cuneata of Forbes. 



P. 82. — L. subattriculata. 



Body pale lemoncolour : tentacles about 40, thick, of different 



VOL. V. I 



