140 Mr. A. Adams on new Mollusca from China and Japan. 



three fathoms mud. I placed them in a clear bottle of salt 

 water, and observed them some time. Chiaje might well be 

 excused for regarding the genus as a Pteropod, for at first sight 

 it has all the appearance and action of a Pneumodermon. My 

 specimens appeared to want the power of crawling altogether ; 

 the animals, after taking short flights, usually upside down, 

 through the water, by butterfly-flappings of the side-lobes of the 

 foot, gently alighted and remained stationary on their stomachs, 

 with the swimming-lobes folded together over the back, until 

 ready for another little excursion. The lower surface of this 

 species, moreover, is coloured exactly like the fins, and shows 

 no signs of a creeping disk. I believe the genus should 

 be placed in the family Lophocercidce, or, rather, Icaridce ; for 

 Prof. E. Forbes had previously described Lophocercus under the 

 name of Icarus. The Chinese species seems to differ from the 

 Mediterranean Gasteropteron in being covered with crimson 

 punctate and reticulate markings. Other points of difference 

 are shown in my drawings. 



Genus Doriprismatica, D'Orbigny. 

 Doriprismatica f estiva, A. Adams. 



B. dorso piano ; tentaculis luteis ; pallio caeruleo ultramarino, luteo 

 late marginato, antice et inter tentacula maculis duabus, in medio 

 linea lata lutea longitudinali et utrinque ejus maculis sex luteis 

 elongatis picto ; branchiis luteis ; pede cseruleo ultramarino, maculis 

 albidis oblongis quinque utrinque ornato. 



Hah. Tsu-Sima (among weeds in pools, low water). 



A species remarkable for the vivid colouring of its body and 

 strongly marked pattern. The proboscis (large and retractile, 

 but short) is of a pink colour. 



Genus Coryphella, Gray. 

 Coryphella Alderi, A. Adams. 



C. pallide lutea, semipellucida ; tentaculis vix annulatis, luteis ; ten- 

 taculis oralibus aurantiis, magnis, elongatis ; branchiis fascicu- 

 latis, singula pallide lutea, linea earminea mediana picta, apice 

 carminea. 



Hab. Off Matsumai, Island of Yesso; Straits of Tsugar (on 



Zostera). 



A very delicate and lovely species, about an inch long, and 

 which I have much pleasure in dedicating to the naturalist best 

 qualified to appreciate its beauty. 



Genus Aplysia, Gmelin. 



1. Aplysia marmorea, A. Adams. 



./. dorso elevato ; lobis pedis magnis, amplis, viridi alboque mar- 



