300 AMERICAN JOURNAL 



ing the head and foot. Dorsal tentacles two, lamellate and re- 

 tractile. Oral tentacles none. Branchise simple, linear, pin- 

 nate, suri'oundiiig the posterior end of the body, retractile into 

 a semicirculMr slit." 



In the Transactions of the Zool, Soc, London, 1864, p. 124, 

 Messrs. Alder and Hancock adopt the above name Doridopsis * 

 for a genus inhabiting India. The species cannot be distinguished 

 externally from the typical forms of Boris. The authors dis- 

 covered, however, that the mouth was suctorial, without teeth or 

 jaws. From this peculiarity, I propose to distinguish it by the 

 name of " Hanstellodoris," the names of both the authors being 

 pre-occupied. 



I take occasion to note that the genus Phyllohranchus (Alder 

 and Hancock) Trans. Zool. Soc, London, 1864, p. 145, is 

 synonymous with Polyhranchia (Pease) Proc. Zool. Soc, Lon- 

 don, 1860, p. 141. This genus differs widely from any previ- 

 ously described and may be easily recognized. The only differ- 

 ence between the species described by Alder and Hancock from 

 India and those inhabiting Polynesia, is that the branchial 

 lobes on the former are slightly indented at their upper termi- 

 nation. On examining several specimens after the original 

 description was published, I came to the conclusion that the 

 radiating lines enclosed in the lobes were not branchiae, and 

 consequently changed the name of the genus to " Lobifera.'" 

 As Messrs. Alder and Hancock have decided them to be true 

 branchiae, the original name should be retained. 



DoRiopsis SCABRA, Pease. Plate 19, fig, 2, a, b, c 



Body coriaceous, subpellucid, pale orange yellow, oval, 

 rounded above, slightly the widest at the middle, covered with 

 minute filiform asperities. 



Dorsal tentacles remote, oblong ovate, mucronate, erect, 

 closely lamellate, retractile into simple cavities, peduncles short. 



Branchige small, plumules 10, linear, pinnate, procumbent, 

 decreasing in length either way from the two central ones, pro- 

 jecting beyond the mantle posteriorly. Head without labial 

 appendages. Foot oblong oval. Dorsal tentacles and branchiae 

 colorless. 



Length, six-tenths of an inch. 



Habitat, Tahiti. 



Station, (under stones, in the upper region of the laminarian 

 zone. Motions extremely sluggish. A.G.) 



* The letter d was dropped for the sake of euphony. 



