ON ZGEAN INVERTEBRATA. 187 
The form of the branchie approaches those of Scyll@a, whilst the tentacula 
are characteristic of Melibea. This minute nudibranc may possibly belong 
to an intermediate genus. 
Order INFEROBRANCHIATA. 
Fam. Pleurobranchacee. Genus PLEUROBRANCHUS, Cuw. 
Pleurobranchus limacoides, sp. nov. 
P. corpore (repente) oblongo, levi, aurantiaco ; pallio ovato plano, contra- 
subemarginato ; cauda exserta lanceolata ; tentaculis elongatis, linearibus. 
Long. 23 unc. Hab. under stones near water-mark among the Cyclades. 
Allied to P. oblongus of Cantraine. 
Pleurobranchus calyptreoides, sp. nov. 
P. corpore ovato, levi, citrino, pallio orbiculari convexo, caud& exserta 
lat’ obtusa, tentaculis linearibus. ; 
Long. 14 unc. Hab. on sponges, 20 fathoms, Cervi Bay, Morea. 
Pleurobranchus scutatus, sp. nov. 
P. corpore rotundato, rubro-aurantiaco ; pallio lato scabro, convexo, anticé 
producto; cauda pallio occulta ; tentaculis linearibus. 
Long. 1 unc. Hab. on Codium tomentosum, in 20 fathoms, Cyclades. 
Pleurobranchus sordidus, sp. nov. 
P. corpore rotundato convexo; pallio rugoso, sordidé brunneo, anticé pro- 
ducto ; pede quadrato, albo ; cauda brevissima ; tentaculis albis linearibus; ore 
aurantiaco. 
Long. 03 unc. Hab. 40 fathoms off Paros. 
Order TECTIBRANCHIATA, 
Fam. Aplysiacee. Genus APLYSIA, Lin. 
Aplysia saltator, sp. nov. 
A. corpore globoso, griseo albo nigroque maculato, tuberculato, tuber- 
culis -mucronatis; sinu branchiali parvo; pede angustissimo, tentaculis bre- 
vibus. 
Long. 2 unc. Alt.1;4;. Hab. 20—30 fathoms. Serpho Bay. 
Genus Icarus, Forbes. 
(The animal for which I propose to constitute the genus Jearus differs 
from Aplysia in having but two tentacula, and in being prolonged posteriorly 
into a slender lanceolate tail. The dorsal shield resembles the shell of a Bullea. 
A full account of the genus will be published elsewhere.) 
Icarus gravesi, sp. nov. 
Animal viridum purpureo, alboque variegatum. Testa alba, pellucida. 
Long. lv unc. Long. test. 534; unc. Syra, Serpho. 
Fam. Aceride. Genus Butta, Lamarck. 
Bullea alata, sp. nov. 
B. testi orbiculari, spiraliter punctato-striata, labro expanso, spiram exce- 
dente, margine integro. 
Long. and lat. 03%. Suda Bay, Candia, in 119 fathoms. (Capt. Graves, 
1843.) 
Genus Buia, Lin. 
Bulla retifer, sp. nov. 
B. test oblonga, laxé convoluta, longitudinaliter transversimque striata, 
epidermide reticulato-vestita, spira truncata, umbilicaté, apertura ovata 
superné coarctata; columella marginata. 
Long. Ov;. Lat. Oy; une. Serpho. 
