GASTEROPODA. S1a)7e 
slender, faintly roseate, and having the eyes at their lateral and poste- 
rior base, almost imperceptible; mantle colourless, finely fringed by 
very short, marginal cirrhi, and having around its whole extent, near 
the edge, a series of thin, large, obtusely triangular lamelle, very 
closely resembling branchie. The branchial organ, however, is very 
large, and conspicuous externally on the right side of the neck. The 
marginal lamelle seem to unite this animal with Patella; but no 
strie, such as usually characterize branchie, were perceptible upon 
them. Asin L. zebrina, they seemed to communicate with the mar- 
ginal cirrhi, and were at times quite turgid, while at others they were 
flaccid and compressed. They were placed at right angles with the 
margin, and about their width apart from each other. ‘They were not 
contractile, but capable of being erected and lowered at pleasure. 
[ise Cal] 
Found imbedded in the stalks of Fuci, in the Bay of Valparaiso. 
Very sluggish. 
The animal of this shell, which is the Patella scurra of Lesson, or 
an allied species, is worthy of notice on account of its approach to the 
true Patella. This has been noticed by Lesson and D’Orbigny, and 
also by Mr. J. E. Gray, in his Synopsis, when speaking of the genus 
Scurra of Eschscholtz. The observations of Mr. Couthouy on this 
animal, and upon that of L. zebrina. throw light on the equivocal 
position of the groups. The genus Scurra may stand, based on this 
character of the animal. 
SIPHONARIA CoRNUTA (Gould). 
Testa rudis, fuliginosa, valde depressa, per-inequilateralis, radiatim 
striata, apice submediano, costis ad quindecim inequalibus, ultra mar- 
ginem prolongatis, precipue costa supra-siphonali: cavitas parva, 
mimme profunda, dextrorsum effusa; limbo marginali expanso, albo, 
vel fusco inter costas radiate. 
Stphonaria cornuta, Gouin; Proceed. Boston Soc. Nat. Hist., ii. 153. 
August 1846. Expedition Shells, 11. 
Suet solid, very irregular and rugged, nearly flat, the apex 
median, but with the siphonal side broadly expanded; colour dusky, 
90 
