Messrs. Alder and Hancock on Nudibranchiate Mollusca. 311 



and at first green, but finally brown ; they are large compared 

 with the size of the plant, and are arranged in a circle near the 

 margin. 



I am indebted to Dr. Dickie for determining the name of this 

 plant, which I had Supposed was one hitherto undescribed, and 

 also for a specimen gathered at Falaise which he had received 

 from M. Lenormand. 



Having sent a British specimen to Professor Kiitzing, he in- 

 formed me, that as far as he could determine from the dried 

 specimen, it is his Phylactidium pulchellum ; but although he 

 considers it distinct from Coleoch(2te scatata^ wliich he has also 

 gathiered in Prussia, I believe that he has Only described its 

 young state as Phylactidium pulchellum, for his figure well repre- 

 sents our plant before the appearance of bristles ; and as it is un- 

 doubtedly Br ebisson^s plant, I have retained the present name*. 



Plate X. fig. 2. Coleoclicele scutata : h, pdrtion of a frdnd in fructifica- 

 tion ; c, portion magnified to show the processes. 



XXXIV. — Notice of a new genus and several new species of 

 Nudibranchiate Mollusca. By Joshua Aider and Albany 

 Hancock, Esqrs. 



Genus Eumenis. 



Body elongated, quadrilateral ; head subinferior, with corneous 

 jaws ; veil very small or none. Tentacles two, dorsal, clavate and 

 laminated, with sheaths. Branchiae papillose, set on a waved 

 pallial expansion down the sides of the back. Foot linear. Ori- 

 fices of the generative organs and of the amis ? on the right side. 

 Eumenis marmorata. Body nearly linear, tapering to an ob- 

 tuse point behind ; olive-brown, streaked and spotted with dark 

 chocolate-brown and white. Head with a few tubercular pro- 

 cesses in front. Tentacles clavate, broadly lamiiiated on the 

 upper part and truncated at the apex ; lower part plain, inclosed 

 in small and rather tight sheaths. The sides of the bddy are pro- 

 duced into a pallial expansion, which undulates ihto three or four 

 lobes, the margin set with irregular papillose braUchise of a fawn- 

 colour with pale edges. Interrupted dark brown markings run 

 down the centre of the back, streaked and spotted on each side 

 with brown and white. The sides of the body below the margin 

 of the cloak are also streaked with interrupted lines of dark brown 



• " Phylactidium, Kiitz. PI13 llonia minutum, monbgtromaticum, orbicu- 

 larc, s. fiabellatiiM coiijuncta coiistituentibus compositum. Spermatia ignota." 

 — Kiitz. Pliijcologia Generalis, p. 294. 



'* 1. P. piikhdlnm, Kiitz. Orbiculare, amcene viride ; celliilis caelogoni- 

 micis, dcmuin transverse zonatis, centro globulb gotiitriicb majori notatis." 

 —Kutz. I. c. p. 295. t. 16. f. 1 1. 



