114 



XI. — Miscellanea Zoologica. By George Johnston, M.D., 



Fellow of the Royal College of Surgeons of Edinburgh. 



Plates II. and III. 



(Continued from p. 56.) 

 2. Triton i a*, Cuvier. 



Character. Body limaciform, the head indistinct : mouth 

 with a pair of corneous jaws, overarched by a veil : dorsal ten- 

 taenia two, fissile and pectinate t> issuing from tubular sheaths: 

 branchiae forming a fringe or a series of arborescent tufts along 

 each side : orifices of generation and anus on the right side in 

 front i foot plane. Cuvier, Reg. Anim. hi. 52. Lamarck, Anim. 

 s. Vert. vi. i. 303. Rang, Man. 131. Blainville, Malacol. 487. 



1. T. Hombergii, branchiae forming a continuous but unequal 

 arborescent crest along each margin of the back. Plate III. 

 fig. 1, 2. 



Tritonia Hombergii, Cuv. Mem. iv. 4. pi. 1, "2. fig. omnes. Lam. Anim. 

 s. Vert. vi. 1. 304. Flem. Brit. Anim. 284. Stark, Elem. ii. 68.— 

 Doris frondosa, Mull. Zool. Dan. Prod, 229. Turf. Gmel. iv. 79. 



Hah. Amongst corallines in deep water, Frith of Forth, Sir J. T. Daly ell. 

 Coast of Berwickshire, not uncommon. 



Desc. Body from two to four or occasionally even eight 

 inches long, oblong, subtetragonal, the back slightly convex 

 or plane, closely covered with small warts of a brownish co- 

 lour with a tinge of bluish grey ; veil over the mouth contrac- 

 tile, but when expanded forming two semicircular lobes with 

 a margin cut into numerous tentacular points. Dorsal ten- 

 taenia issuing from a wide uneven sheath, columnar, the base 

 white, the upper half dusky, divided into fine beautifully pec- 

 tinate segments forming a circle, on the posterior side of which 

 there is a short cylindrical filament with a pale apex. Branchiae 

 encircling the body in numerous arbuscular tufts connected 

 by a lower fringe of the same kind. Sides of the body smooth 

 or granular, the anterior vent protuberant, the posterior 

 smaller and somewhat lobed. Foot watery white, oblong, 



* Formed from Triton, the name of the trumpeter to Neptune. It rather 

 unfortunately happens that Tritonia is, however, one of the names of Mi- 

 nerva ; and Triton has been too frequently honoured by zoologists. 



f " Les tentacules eux-memes ont la forme de panaches composes de 

 cinq plumes, dechiquetees comme les feuilles des fougeres." — Cuvier, 



