Doriopsis.] GASTROPODA. 579 



and semitransparent, much undulated. On each side of the back is 

 a row of 3 or 4 large conical or clavate erect tubercles ; 2 similar ones 

 are placed close together between the rhinophores. Numerous much 

 smaller tubercles are scattered irregularly over the back and sides. 

 Along the back, between the large tubercles, is a median row of 3, 

 rarely 2, large lozenge-shaped smooth areas, free from tubercles or 

 projections of any kind. On each side a similar row of 4 or 5 smooth 

 areas extends from the rhinophores to the branchiae, on the outside 

 of the row of tubercles. These areas are coloured a deep velvety brown- 

 black, and'each contains a central spot and a few lateral specks or 

 streaks of an intense greenish-blue of almost metallic lustre. The 

 remainder of the mantle is a light brown or fawn colour, always marked, 

 especially towards the margins, with numerous delicate whitish or 

 greyish parallel longitudinal lines, which are more or less continuous 

 towards the margins, but are irregular and broken at the back. The 

 rhinophorial sheaths are thin, about 1-5 mm. high, not divided or 

 lobed. The rhinophores are rather large, reflexed. and bear about 

 30 deep perfoliations. Branchial pocket shallow, with a few black 

 spots on the floor. Its edge is irregularly 5-lobed, the lobes more 

 or less tubercled. The branchice. are 6, tripinnate, yellow, but the 

 rhachides of the extreme ramifications are black. The foot has ample 

 lateral margins, is pointed in front, and not grooved. Over the mouth 

 are 2 rather broad flat tentacles. 



Length, 5-10 cm. Length, 46 mm. ; breadth. 26 mm. ; height, 

 14 mm. (spirit specimen). 



For full anatomical details see Sir Charles Eliot's paper. 

 Type in the British Museum. 



Hob. Mangonui to East Cape, on Zoster a beds (Cheeseman) ; 

 Cheltenham Beach, Devonport, end of December (H. S.). 



Genus 2. DORIOPSILLA, Bergh, 1880. 



Doriopsilla, Bergh, Jahrb. d. Deutsch. Malak. Gesell., vii, 1880, 31(3. Type : 

 D. areolata, Bergh. 



The dorsal surface is granulate, and harder than in Doriopsis, 

 but the chief difference between the two genera is that, whereas in 

 Doriopsilla the buccal ganglia beneath the alimentary tube lie im- 

 mediately behind the main body of the central nervous system, in 

 Doriopsis they lie at some distance behind it on a constriction of the 

 alimentary tube, and are united to the nerve-collar by rather long 

 connectives. 



The type is from the Mediterranean ; the genus has further 

 been recorded from India and California. The Australasian species 

 Actinodoris australis, Angas, has been assigned to this genus by 

 Bergh. 



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