Fam. 3, Plate 38. 

 EMBLETONIA PULCHRA, Alder and Hancock. 



E. oblonga, caraea, albo punctata; lobis capitis rotundatis; tentaculis brevibus, di stantibus ; 

 branchiis ellipticis aurantio-coccineis, albo punctatis ; 5 — 6 utroque dorsi latere, serie unica, dispositis. 



Pterochilus pulcher, Aid. and Hanc, in Ann. Nat. Hist., v. 14, p. 329. 



Hob. Under stones at low-water mark. Rothesay Bay, Isle of Bute, J. A. Saltcoats, Ayrshire, 

 Rev. D. Londsborough, junr. 



Body about two tenths of an inch long, nearly linear, semitransparent, pale flesh- 

 coloured, minutely spotted with opaque white. Head lobes expanding into a kind of veil, 

 indented in front, and produced and rounded at the sides. Tentacles linear, rather short and 

 blunt, of the same colour as the body, placed laterally just above the termination of the lobes. 

 Branchia large, elliptical, with the central vessel bright orange-red, nearly filling the trans- 

 parent sheaths, which are spotted with opaque white ; the red portion is slightly granular, 

 and disposed in indistinct transverse bands. The papillae are set in a single row of five or six 

 down each side of the back ; the first and second pairs are nearly opposite each other, the rest 

 alternate. The gastric vessel may be seen through the transparent skin of a pale orange 

 colour, forming two lateral lines before the heart, and a single one behind it, undulatino- 

 down the centre of the back, and sending off alternate branches to the papillae. Foot linear, 

 very narrow, transparent, flesh-coloured, truncated in front, and terminating not far behind 

 the branchiae in a blunt point. 



A specimen from Saltcoats, varied a little in colour from the above description ; the 

 body being almost colourless, and the papillse of a chesnut brown. 



The only localities we have to record for this handsome and very rare little mollusk are 

 confined to Scotland. We are not able to say whether the JEolidia minima, dredged by 

 Professors E. Forbes and Goodsir, in Bressay Sound, Shetland, and communicated by the 

 former to the British Association meeting at Birmingham, in 1839,* is a distinct species of 

 this genus, or merely a variety of the present. The original sketch by Professor Forbes, 

 liberally placed in our hands, shows the papillae more slender than in ours, as well as an 

 additional pair, but as the limits of variation in this species are not yet sufficiently known, we 

 shall leave the matter for future decision. 



Figs. 1, 2, 3. Embletonia pulchra, different views. 



4. Gastric system. 



5. Jaws and tongue. 



6. Three spines from the tongue. 



7. An eye. 



8. Ear capsule and otolite. 



9. Male generative organ. 



See Athenaeum for Aug. 31, 1839. 



