62 DENDRONOTID^E. 



conical tubercles, and a terminal one at the apex ; the tips 

 are without spots ; papillae 6 on each side : foot narrow, a 

 little expanded in front. L. 0'5. 



HABITAT : In 75-80 f . on the " Outer haaf," off the Whalsey 

 Skerries, Shetland (Jeffreys and Waller). 



This species, of which a single specimen was obtained during 

 the Shetland dredging-expedition in 1861, comes very near to 

 D. coronata, from which it differs in the papilla? having much 

 more pointed tubercles, without the terminal spot. The ten- 

 tacular sheaths also have scalloped margins, and the veil is 

 more arched than in D. coronata. 



Family VI. DENDRONO'TID^E. 



Mantle wanting : tentacles 2, dorsal, with or without sheaths : 

 branchial processes branched or papillary, set in single series 

 down each side : mouth with jaws. 



Genus I. DENDRONO'TUS [*], Alder and Hancock. 

 [PL II. f. 6.] 



BODY limaciform : tentacles laminated, retractile within 

 branched sheaths : head with a branched veil : branchial pro- 

 cesses branched, set in single series on the sides of the back : 

 vent lateral : odontophore rather narrow, with a large central 

 spine and several smaller lateral ones increasing centrally ; all 

 the spines are minutely denticulated. 



DENDRONOTUS ARBORESCENS, Miiller. 



Doris arborescens, Mull. Prod. p. 229. Dendronotus arborescens, A. & H. 

 Brit. Nud. Moll. fam. 3, pi. 3. 



BODY elongated, rather compressed laterally, reddish- or 

 yellowish-brown, marbled with darker brown and spotted with 

 white: tentacles laminated, yellowish, retractile within long 

 narrow sheaths, branched at the top : head-veil with from 4 

 to 6 branched processes : branchial processes with a nearly 



[* Back having a tree-like appearance.] 



