M. Valenciennes on the Organization of Lucia and Corbis. 41 
Section TRIMERA. 
Family CoccINELLIDA,. 
Scymnus Galapagoensis. Scym. ater, pubescens ; capite piceo; tho- 
race utrinque flavo; elytris pallide testaceis, indistinctissime punc- 
tulatis ; sutura, margine anteriore, fascia valde flexuosa, maculisque 
duabus subapicalibus, nigris ; antennis pedibusque flayis.—Long. 
corp. $lin. 
From James’ Island. 
This species is about equal in size to the Se. minimus ; its form 
is rather more elongated and less convex than im that insect. The 
suture of the elytra is black; the black forms a broad mark at 
the base, but becomes very narrow towards the tip of the elytra ; 
the outer margin of each elytron is narrowly edged with black, but 
on the anterior third the dark colour is suddenly expanded, and 
forms a broadish mark which extends to the humeral angle, and 
there meets a broad transverse black mark which crosses the base 
of the elytra: about the middle of the elytron is a narrow black 
fascia, which as it parts from the suture descends, about the 
middle is suddenly bent upwards so as to become longitudinal, 
and then again descends obliquely outwards and nearly reaches 
the outer margin: behind this central band is an obhque black 
spot. 
V1.—Ona the Organization of the Lucine and of Corbis. 
By Mi:A. VaLenciEnneEs*. 
Tose anatomists who have been engaged in the study of the 
Acephalous Mollusca, that numerous class of animals related to 
the oysters, mussels, &c., regard as one of the constant characters 
of these creatures, that the respiratory organ fixed on each side 
of the body under the folds of the mantle is composed. of two 
pairs of branchial leaflets, 2. e. that under the common covering 
of the body there are four branchize arranged symmetrically on 
each side of the visceral mass. 
These branchiz are m some pectinated, or composed of small, 
straight and triangular lamine arranged close together; the 
oysters, scallops, and the Spondyli present examples of this general 
structure, which calls to mind that of the branchiz of almost all 
the osseous fish. In other Acephalous Mollusca the pectinated 
lamelle are connected by numerous transversal ridges which im- 
part more consistence to the branchial leaflet and render it more 
dense ; the Anodonta, so common in all our fresh waters, offer, 
with a large number of other Acephala, examples of this struc- 
ture; a confirmation which is seldom met with in fish, for Xiphias 
is the only one in which I have observed this arrangement, 
* From the Comptes Rendus, June 9th, 1845. 
