TRIOPA. 573 



to nine in number, forming a complete circle of a deep 

 chestnut colour round the vent. Foot broad and ex- 

 panded. 



This fine species was discovered between tide-marks at 

 Salcombe in Devonshire, by Mr. Alder, and afterwards 

 found at Saltcoats in Ayrshire, by Mr. David Lands- 

 borough, Jun. 



TRIOPA, Johnston. 



Body oblong ; the mantle edged with filamentous ap- 

 pendages bordering the margins of the back. Tentacles 

 clavate, pectinated, retractile within simple sheaths. 

 Branchiae few, pinnate, placed about (or in front of) a 

 dorsal vent. 



1. T. cLAviGER, Miiller. 



Plate A. A. A. fig. 1. 



Doris clavigera, Muller, Zool. Dan. vol. i. pi. 17, f. 1-3. 



Tergipes claviger, Johnston, in Loudon's Mag. Nat. Hist. vol. vii. p. 490, f. 59. 



Euplocamus plumosus, Thompson, Ann. Nat. Hist. vol. v. p. 90, pi. 2, f. 4. 



„ claviger, Thompson, Rep. Brit. Assoc. 1843, p. 250. 



Triopa claviger, Johnston, Ann. Nat. Hist. vol. i. p. 124. — Aluer and Han- 

 cock, Monog. part 4, fam. 1, pi. 20. 



The body of this pretty nudibranch is less than an inch 

 in length, of an oblongo-lanceolate shape, flattened above, 

 and of a general white hue, variegated with bright yellow, 

 or orange, that colour being always placed on some of the 

 appendages, as the tubercles of the back, the upper part of 

 the branchial tentacula, and lateral appendages. The 

 latter organs are linear ; those of them that are imme- 

 diately in front, differ from the side ones in being of smaller 

 size, more closely set (eight or so in number), and having 

 tuberculated extremities. The oral tentacles are two, 

 short, truncate, and auriform. The branchial plumes are 



