NOTES ON SOME BRITISH NUDIBRANCHS. 337 



branchife become bi- or tripinnate and the valvular tubercles less 

 distinct.* The following forms would perhaps be referable to the sub- 

 genus Staurodoris : — 



1. St. verrucosa (Cuvier). 

 >S^^. pseudoverriccosa, J her. 

 St. januarii, Bergh. 



2. St. bertheloti (d'Orbigny). 



3. St. (Vorhigmji (Gray). 



4. *S^^. 2>ustulata (Abraham). 



[See Hedley and Basedow, Trans. Roy. Soc. 

 S. Australia, vol. xxix., 1905, p. 150, pi. ix.] 

 0. 'S'^. maculata (Garstang). 



6. St. depressa, Eliot. 



7. St. calva, Eliot. 



8. St. hicolor, Bergh. ^ 



9. St. rusticata (A. & H.). 



10. ? St. peden, Eliot. 



11. ? St. fiahdlifera (Cheeseman). 



Tlie last two species have a peculiar configuration of the branchige, 

 which renders their inclusion in this genus doubtful. St. bertheloti and 

 St. d'orhignyi are only known from very imperfect descriptions. 



STAURODORIS VERRUCOSA (CUV.). 



Two specimens from the Museum of the Manchester University, 

 labelled as coming from the Firth of Clyde. Tiie larger is 35 mm. 

 long and 21 broad ; tlie other slightly smaller. The details given below 

 refer to the larger specimen, unless otherwise stated. 



Both specimens are depressed, rather stiff and hard, uniform whitish 

 yellow in colour. The back is studded with large and small tubercles. 

 There are fifteen of the former, about 3 mm. high and 2 mm. broad. 

 Smaller ones are scattered among them, and the tubercles decrease in 

 size towards the edge of the mantle, which is fairly wide. The foot is 

 broad ; no groove or notch is visible on the anterior margin. The 

 tentacles are ridge-like. 



The rhinophore pockets are protected by four tubercles (two large 

 and two small) in the smaller specimen and by three in the other, one 

 of the smaller tubercles not being developed. The branchi;e are simply 

 pinnate, eighteen in the larger specimen, fourteen in the smaller. The 

 pocket has a thin slightly raised lip, Ijearing eight tall, slender tubercles 

 about 3"5 mm. high, alternating fairly regularly with quite small ones. 



Tho intestines are yellowish, except the stomach, which is black from 



* Vayssifere's figure of the Meditenanean ArchidorU tubtrculata {Opisth. de Marseille, iii. 

 1)1. 1, fig. 1) aeeius to me to have the external characters of Staurodoris. 



