April 12, 1842. 
The Meeting was adjourned to April 26th. 
April 26, 1842. 
William Horton Lloyd, Esq., in the Chair. 
The following ‘‘ Description of a new Dorsibranchiate Gasteropod, 
discovered at Madeira,” by the Rev. R. T. Lowe, was read. 
Class MOLLUSCA. 
Ord. GasrERopopa. 
Fam. Nupiprancura (Les Tritoniens, Lam.). 
Gen. Prpuipra. 
Char. Gen.—Corpus limaciforme, repens, oblongum; posticé com- 
presso-triquetrum, dorso abrupté (ut in Scy//ed) cristatum s. alato- 
carinatum ; apice attenuato, acuto. Caput anticé (ut in Thethye, L.) 
veliferum ; velo semicirculari, margine fimbriato-lacero, ciliolato : 
ore inter labia buccalia subtis, simplici. Tentacula (ut in Doride) 
duo. Orificium generationis ad colli dextrum. Branchie diplo- 
morph: s. in medio dorsi (ut in Doride) circa anum stellatim 
ramose, arbusculiformes, ramis pectinato-ciliatis; et per latera 
utrinque (ut in Tritonia Thethyeve) longitudinaliter biseriate, 
conico-papilliformes ; papillis apice subdivisis, ciliatis. 
Obs. Corpus totum glabrum, leve, subpellucidum. Oculi nulli. 
Spec. Peplidia Madere, nob. 
Hab. in mari Maderensi-atlantico, inter rupes littorales in aquis 
zestu relictis; rariss. { 
A single example of this beautiful and extremely interesting mol- 
lusk was discovered on the 24th of April, 1841, by Dr. Lister, in a 
pool left by the tide amongst a reef of rocks called the Gorgulho, 
situate a little to the west of Funchal. It presents a combination of 
generic characters, by which, if it approximates in each apart by turns 
to Doris, Thethys, Tritonia, and Scyllea, it differs notably from all. 
The large dorsal star-like tuft of branchie, and the tentacles, resem- 
ble those of Doris; but it differs totally in other characters : the veil 
.before the head, though smaller and differently fringed, together 
with the rows of branchiferous papilla down the back or sides, bring- 
ing it somewhat nearer Thethys, from which it is essentially distin- 
guished, as it is also from Trifonia and Scyllea, by its Doridian 
No. CXI.—Procerrpines oF tHE Zoou. Soc. 
