Fiona.] GASTROPODA. 587 



Hob. Sumner, on roots of D'UrwllcBa utilis (Hutton) ; New 

 Brighton, on floating timber (H. S.) ; Pigeon Bay ; Chatham Islands 

 (Professor Schauinsland). 



Bergh thinks the species to be circumsequatoral. 



On the cpll-lineage and early larval development of F. marina : 

 D. B. Cnsteel. in Proc. Acad. Nat. Sri. Philad., Ivi, 1904, 325-405, 

 pi. 21-35. 



Tribe 4. ELYSIOMORPHA. 



Nudibranchia in which the liver ramifies in the integuments and 

 extends into the dorsal papilla?. The genital duct is always triaulic, 

 and the male and female orifices are distant. The gonad is divided 

 into spheroidal hermaphrodite lobules. There are no mandibles, 

 and the radula is uniserial. There is never more than 1 pair of ten- 

 tacles, and these are wanting in some genera. 



Fain. HERM^EnXSI, Adams. 



Body depressed ; rhinophores simple, canaliculate, or wanting. 

 Dorsal papillae without nematocysts, linear or fusiform, and disposed 

 in several series. Foot narrow. Teeth of radula narrow. 



Genus 1. STILIGER, Ehrenberg, 1831. 



Stiliger, Ehbg., " Symbolse Physicse," i, 1831. Type : Calliopcea bellula, 

 d'Orbigny. Calliopcea, d'Orbigny, 1837. Custiphorus, Deshayes, 1864. 



Body elongated. Rhinophores simple, filiform, non - retractile. 

 Dorsal papilke fusiform or ovoid, disposed in one or several series. 

 Anus antero-dorsal. Foot rounded in front, angled at the sides. 



Distribution. North Atlantic, Red Sea, New Zealand. 



1. Stiliger felinus, Hutton, 1882. Plate 23, fig. 22. 



Calliopcea felina, Hutt., N.Z.J.S., i, 1882, 69 ; T.N.Z.I., xv, 1882 (1883), 

 133, fig. in text : i.e., 118, pi. 13, f. B (dentition). Stiliger felina, Hutt., 

 Index, 68. S. felinus, Hutt. : Eliot, P. Mai. S., vii, 328, 330. 



Body elongated, the integuments very thin, translucent, head 

 small. Colour dark brown to black ; the dorsal surface and the 

 inner side of the larger anterior cerata are of a deep rich purplish- 

 brown, almost black. The outer sides of the larger cerata, the whole 

 of the posterior cerata, and the sides of the body are lighter brown. 

 At the tip of each of the cerata is a lighter but not very conspicuous 

 spot. Conspicuous, however, and bright white are the anal papilla 

 and the tips and under-sides of the rhinophores. From each rhino- 

 phore a band runs downwards ; the two bands meet and form a white 

 border across the head. The cerata are set in from 6 to 10 transverse 

 rows, consisting of from 2 to 3 cerata each, but the third longitudinal 

 line of cerata is not perfectly developed in any specimen. The 

 inner cerata are considerably larger than the outer, and in some speci- 

 mens one or two of them are markedly larger than the others. In 



