1880.] NATURAL SCIENCES OF PHILADELPHIA. 85 



The species is easy to distinguish from the former, by its color and 

 especially by the denticulated hook of the large lateral plates. 



5 Adalaria Loveni (Aldir et Hancock). PI. X, fig. 6-S. 



Doris muricata? O. F. Miiller, Sars, Bidr. til Soedyreues Naturb., 



1829, p. 15. Tab. 11, fig. 7, 8. 

 Doris Loveni, Alder et Hanc. Ann. Mag. Nat. Hist., 3 Ser., X, 18(>2, 



p. 262. * 



Lamellidoris Loveni, Friele et Arm. Hansen, 1. c. p. 3. 

 Lameliidoris Loveni, G. O. Sars. Moll. reg. arct. Norv., 1878, p. 364. 



Tab. XIV, fig. 1. 

 ? Lamellidoris muricata (Mull.) Abildgaard. Morch, Faunula Moll. 



Ins. Fiiroens. Naturb. Foren. Yidsk. Meddel., 1867, p. 75.' 

 Doris muricata, Miiller, Sars ('>), Loven, lud. Moll., 1846, p. 5. 

 Doris muricata, M. Sars. Reise i Lofoten og Fiumarken, 1851, p. 75. 



Color dorsi et rhinophoriarum e brunneo lutescens, paginal inferioris 

 et branchiae lutescens. 



Dentes laterales (magni) hamo edentulo ; externi (linguae) 

 numero 12. 



Hob. Oc. Atlant. septentr. 



This species was first noticed by Sars, who hesitatingly regarded it 

 as perhaps the Doris imiricata of Mueller. It is, moreover, the prin- 

 cipal form of the Doris muricata (" Mueller, Sars ") of Lovt'n (his 

 second variety being the true L. muricata) ; has been established 

 (1862) as a species by Alder and Hancock, and has as such been 

 adopted by Friele and Hansen, as well as by G. O. Sars, who lately 

 gave figures of the teeth on the tongue. The species has been much 

 confounded with the *' D. muricata," which is a Lamellidoris ; it is 

 certainly distinct from the Ad. proximn^ and seems also to differ from 

 the other described species. 



Of this form I have had fifteen individuals for examination, kindly 

 sent me by Mr. Friele, of Bergen, and dredged in the neighborhood of 

 that place. 



' According to Morch (Rink. Gronland, I, 1857. Tillaig 4, p. 78), the D. 

 muricata, Sars, should bo the D. liturata, Beck ; this last is a mere variety 

 of the Lamellidoris bilamellata, and with this should, on the other hand, 

 accoidiug to Morch (Faunula Mollusc. Isl. Naturh, Foren. Vidensk. Med- 

 del., 1868, p. 203), the D. proximo of Meyer and Moebius be synonymous, 

 which belongs to the quite diflferent genus, Adalaria. An example more — 

 if such were needed — of the way in which the Nudibranchiata have been 

 .synonymized and systematized. 



