298 



NUDIBRANCHS AND TECTIBRANCHS FROM THE 



INDO-PACIFIC. 



II., Notes on Lophocercus, Lobiger, Haminsea, and Newnesia. 



By sir CHARLES ELIOT, K.C.M.G. 



(Read before the Society, December 13th, 1905). 



Plate V. 

 LoPHOCERCiD^: H. AND A. Adams. 



For the previous literature of this family, anatomical and systematic, 

 reference may be made to Bergh,^ Pilsbry,- and the authorities cited 

 by these writers. More recently Mazzarelli '" has given some further 

 biological notes on Lobiger. 



The Lophocercid^e are of moderate size, with thin bulloid shells, 

 which do not nearly contain the body, and with variously developed 

 lateral lobes. They can swim as well as crawl. The gill consists of 

 a row of lamellae attached to the under-surface of the mantle. There 

 are no jaws or stomach plates, but a large buccal crop is present, as 

 well as a diverticulum of the oesophagus. The radula is ascoglossan. 

 The sexual orifices are widely separate ; the male orifice lies under 

 the right rhinophore, and is connected with the rest of the reproduc- 

 tive apparatus by an internal duct, not by an external groove. 



The members of the family, though nowhere common, appear to be 

 generally distributed in the warmer waters of the Mediterranean, 

 Atlantic, and Indo-Pacific, but have not hitherto been found on the 

 west coast of America. The species show surprisingly little variety, 

 so that some authors have thought there is only one for each genus. 

 I myself am inclined to think that the Atlantic and Indo-Pacific forms 

 can be distinguished, though they are nearly allied. Several species 

 have been imperfectly described, but the following seem fairly certain. 



Lophocercus. 



f I. Lophocercus sieboldi (=olivacea) Krohn. Med. and 

 -| Atlantic. 



I 2. L. antillarum {Morch). Atlantic. 

 3. L. viridis Pease. Indo-Pacific. 



Lobiger. 



1. Lob. philippii ( = serradifalci) ^ Krohn. Med. and prob- 



ably Atlantic. 



2. Lob. nevilli Pihbry. Indo-Pacific. 



1 " Malacologische Untersuchungen," Seni(>ers Reise7i,y\\., part 2, section ii., i. p. 186,^. 



2 " Man. Conch.," vol. 16, p. 161, ii. 



3 Atti. Soc. Ital. Mus. Milano, vol. 42, part 3, p. 281, Nov., 1903. 



4 Authors give the specific name variously, according as they consider that Lob. pliilippii 

 Rrohn can or can not be identified with the earlier Bultea serradi/aki of Calcara. 



