312 Transactions. — Zoology. 



EXPLANATION OF PLATE XVII. 



Fig. 1. Puparium of Ephydra, viewed ventrally, slightly from the right 

 side ; claw-bearing segments numbered, b, patch of black 

 plates on segment 1. The spines covering the body are omitted 

 from these figures. 



Fig. 2. Side view of the hinder part of the body, showing the clasping- 

 organ formed by the 8th and 10th segments. 



Fig. 3. Ventral view, in outline, with part of the body-wall cut away to 

 expose the pupa within, a, anterior triramous spiracle- bearing 

 outgrowth ; d, cavity within puparial skin ; e, pupal envelope ; 

 /, imago within the pupal envelope, diagrammatically repre- 

 sented ; g, paired group of claw-like spines on 8th segment ; 

 i, anus ; m, mouth ; p, pharyngeal skeleton (seen through the 

 skin). 



Fig. 4. Anterior end of a larva, showing the armature of the mouth and of 

 the anterior margins of segments 1 and 2. a, anterior spiracular 

 outgrowth; b, triangular group of spinose plates; m, mouth; 

 n, the base of antennae (? = true head); s, trifid sensory hairs. 



Fiat. 5 The mouth enlarged, showing the probably " true head " retracted 

 within, n, one of the antennae ; h, " true head." 



Fur. 0. Pharyngeal skeleton of the larva, m, mouth ; p, pharynx. 



Fie 7. Anterior spiracuiar outgrowth, with its air-canals passing back 

 to the trachea (i). At edsre of figure is seen a few of the plates 

 (marked // in fit;. 4). 



Art. XXIV. — Notes on some Nudibranch Molluscs from New 



Zealand. 



By W. B. Benham, D.Sc, M.A., F.Z.S., &c, Professor of Biology 

 in the University of Otago. 



[Read before the Otago Institute, llth October, 1904.] 

 Plate XVIII. 

 A few years ago I sent a number of nudibranchs that I had 

 collected at various places round our shores to the Danish 

 specialist, Dr. R. Bergh. A description of these, and of others 

 sent by Mr. H. Suter, has been published in an elaborate mono- 

 graphic serial, which is not likely to be available to naturalists 

 in this colony ; nor, indeed, would it occur to students of the 

 New Zealand fauna to search the pages of Semper's " Reise im 

 Philippinen" for information about new species limited, so 

 far as is known, to our coasts. Nevertheless, in the sixth 

 part of Bergh's " Malacologisch Untersuchungen," which forms 

 volume ix. of Semper's Expedition, may be found not only 

 descriptions of our nudibranchs, but others from Tasmania and 

 from Rarotonga ; still others from Lamlash Bay, in Ireland ; 

 from the coast of Alaska ; from South Carolina ; and from Porto 

 Rico! 



