556 GASTROPODA. [Opisthobranchia.- 



The retracted rhinophores are 3-5 mm. high, with the usual struc- 

 ture. The back is finely tuberculated. The short arborescent gills, 

 numbering 13-14 on each side, are nearly of equal size. The anus 

 is situated below the fifth gill. The genital pore as usual. The foot 

 is narrowed in front and behind ; the margin relatively thin ; the 

 tail (metapodium) short. Colour of animal, in alcohol, yellowish- 

 white. 



Dimensions. The length is 4 cm., with a breadth (without the 

 gills) of 1-5 cm., and a height of 1-3 cm. The breadth of the buccal 

 veil is 10 mm., its lobes 2-5 mm., and the tentacles 2 mm. The height 

 of the rhinophore-sheath is 4 mm. ; the height of the gills is 4 mm. ; 

 breadth of the sole of the foot, 15 mm. ; length of tail, 3 mm. 



Hob. One specimen was obtained by trawling between Kaipara 

 and New Plymouth (s.s. " Doto," 1901). ' 



Remark. This form can scarcely be identified with any of the 

 Tritonias from the Pacific hitherto sufficiently studied ; it is distinct 

 from T. Challenc/eriana and T. dioncedea, while from T. exsulans it 

 differs in the buccal veil and the number of teeth of the radula. 



Tribe 2. DORIDOMORPHA. 



Nudibranchia with external symmetry, in consequence of the 

 median position of the anus, which is posterior and generally dorsal, 

 and surrounded by ramified pallial appendages constituting a secondary 

 branchia. The liver is not ramified in the integuments. The genital 

 duct triaulic. Spicules present in the mantle. 



Fam. GONIODURIDID/E, Adams. 



Mantle-border projecting ; frontal veil reduced, and often covered 

 by the anterior border of the mantle. 



Genus 1. GONIODORIS, Forbes, 1840. 



Goniodoris, Forbes, A.M.N.H., v, 1840, 104. Type: Doris nodosa, Montagu. 

 Pelagella, Gray, 1850. 



Body oblong or lanceolate, not much depressed, smooth or granu- 

 lated, the granules sometimes arranged in rows. Mantle small, ex- 

 posing the head and foot, not furnished with appendages. Rhino- 

 phores clavate, laminated, not retractile nor invested with sheaths. 

 Branchia not retractile, arranged in a circle round the anus, the plumes 

 simply pinnate. Head advancing, with flat tentacles. Jaw with 

 small hooks or tubercles. Radula without central teeth, with the first 

 lateral tooth large, unciform. Verge armed with rows of booklets. 



Only few species are known, chiefly from the Atlantic, Indian, and 

 Pacific Oceans, and from the Mediterranean. 



