GASTEROPODA TECTIBRANCHIATA. 347 







pl. depilans, L.; Bohatch., Anim. Mar. pi. i and iij Rang, 

 pi. xvi. Blackish, with large greyish, clouded spots. 

 Several other species are found in distant seas(l). 



DoLABELLA, Lam. 



The Dolabellae only differ fi-om the Aplysioe in the position of the 

 branchiae and their surrounding envelope; they are at the posterior 

 extremity of the body, which resembles a truncated cone. Their 

 lateral crest presses closely on their branchial apparatus, merely 

 leaving a narrow furrow; their shell is calcareous. They are found 

 in the Mediterranean and in the Indian Ocean(2). 



NOTARCHUS, CuV. 



The lateral crests united and covering the back, a longitudinal emar- 

 gination excepted, that leads to the branchiae, which have no man- 

 tle to cover them, but are otherwise like those of the Aplysiae ; the 

 rest of their organization is always the same(3). In the 



BuRSATELLA, Bkinv. 



The lateral crests are united in front in such a manner as only to 

 leave an oval aperture for the transmission of water to the branchiae, 

 which are also deprived of a protecting mantle(4). 

 These two genera, however, probably form but one. 



(1) ^plysia IrcLsiliana, Rang', pi. viii, 1, 2, 3; A. dadylomela. Id., IX; A. pro- 

 tea, Id., X, 1; A. sorex. Id., X, 4, 5, 6; Jl. tigrina. Id., XI; A. maculata. Id. 

 XII, 1 5; d. marmorata, Blainv., Jourii. de Phys., Janv., 1823, Kang, XII, 6, 

 7; A. Keraudrenii, Id., XIII; A. Lessotiii, Id., XIV; A. camelus, Cuv., Ann. du 

 Mus., and R.angjXV, 1;A. alba, Cuv., lb., and Rang-, XV, 2, 5; A. napolUana, 

 Id., XV, bis; yi. virescens, Risso, Hist. Nat. Mer., pi. 1, 7. It is well, iiowever, 

 to observe, that most of the Aplysis having' been drawn from specimens preserved 

 in spirits, the ti-uth of the specific characters of some of them may be doubted. 



(2) DolaheUa Rumphii, Ciiv., Ann. du Mus., V, xxix, 1; and Rumph. Thes. 

 Amb., pi. X, 6, from the MoUuccas, or Aplysia Rumphii, Rang-, pi. i; -ipl. ecau- 

 data, Rang, pi. ii; A. trumata. Id. ;./?. teremidi. Id. Ill, 1; .5. gigas. Id., Ill, 

 4; A. Hasseltii, Id., XXIV, 1. 



(3) Notarchis gelatinosus, Cuv., to which M. Rang associates the Bursatella Sa- 

 vigniana, Descr. de I'Eg., Zool., Gaster., pi. ii, f, 1; 2, and Rang, ApL, pi. xx,and 

 his Apl. Pleii, pi. xxi, and some small species. 



(4) Bursatella Leachii, Blainv., Malac, pi. xliii, f. 6. 



N.B. Authors have also approximated to the Aplysiae the Apl. viridis, IMontag., 

 Lin. Trans., VII, pi. vii, which forms the genus Act;uon of Oken, and which is at 

 least closely allied to the Elysie timide, Risso, Hist. Nat. Mer., IV, pi. i, f- 3, 4; 

 as I am not acquainted with the branchiae of either, I cannot class them. 



