316 Transactions. — Zoology. 



The anal papilla is nearly in the centre of the branchial crown. 

 The mantle-flap* is of nearly the same breadth throughout ; its 

 under-surface smooth. The foot is rounded in front, with well- 

 defined marginal groove ; the margin is not very narrow ; the 

 tail short. 



[Remarks (p. 33).] From its coloration this form probably 

 represents a new species ; possibly it is identical with one or 

 other of the " species " recently described from the Pacific 

 Ocean.f 



[I confess I do not understand the above remark. If it is 

 merely its coloration that distinguishes it, it seems scarcely pro- 

 bable that that would justify the formation of a new species. 

 I may note that Sir G. Eliot, in his account of the " Nudibranchs 

 of East Africa and Zanzibar,"! suggests that his A. africana may 

 be identical with this species, and A. umia with A. nannula. It 

 is rather odd that Bergh does not refer to Abraham's paper in 

 the Proc. Zool. Soc. 1877, in which several opisthobranchs from 

 our coasts are described and figured. It is evident that all our 

 nudibranchs require working over carefully, for it seems likely 

 that the littoral forms have received more than one name. It 

 will be seen, later, that in the case of other species there is the 

 same hesitation or doubt as to its novelty or otherwise. Unfor- 

 tunately, the valuable memoirs that Bergh has been publishing 

 for some years past are very much too expensive for individual 

 workers to purchase, and none of our libraries possess the work.] 



A. nannula, Bergh, n. sp. [p. 33], pi. iii., fig. 2. 



Of this form Benham has forwarded seven individuals, ob- 

 tained at Port Chalmers, Otago Harbour. [I collected some 

 dozens of this bright little species when the s.s. " Ringarooma " 

 was in dry dock, after being at moorings for about a year in 

 Deborah Bay, amongst the seaweeds, Bryozoa, sponges, &c, 

 adhering to the bottom of the ship. I collected a considerable 

 number of interesting animals, amongst others the Goniodoris 

 castanea, referred to above.] 



[Colour.] During life they are light - orange - coloured. In 

 alcohol the seven individuals agree pretty well in colour, size, 

 and form. They were entirely yellowish-white. 



[Dimensions.] The length averages about 18 mm., with a 

 breadth up to 14 mm., and a height of 3 mm.; the breadth of 



1 liv this I translate " Mantelgebram." 



f R. Bergh: ( hall. Repr., p. 85; Die Opisthobr., Alaska, 1894, p. 159 

 ( 1. Icergudensis) ; Die Opisthob. d. Sammlung Plate, Zool. Jahrb., Suppl., 

 iv., 3, 1898, p. 501 (.1. rubescc n * • .1. (?) inrcrta); Ergebn. Reise. n.d. Pa- 

 cific (Schauinsland), Zool. Jahrb., xiii., 3, 1900, p. 222 [A. ntjctea). 



% P.Z.S., 1904. 



