MOLLUSC A — CONCHIFERA. 
145 
TUBULIBRANCHIA. 
Vermetus eburneus, Reeve. (Proc. p. 197.) 
CIBBIBIIANCHIA. 
Dentalinm longirostrum, Reeve. (Proc. p. 197.) 
CONCHIFERA. 
Milne Edwards has discovered, in Pecten glaber^ male and 
female sexual organs, and so proved the hermaphrodite nature 
of these animals. Annales des Sc. Nat. xviii. p. 321, 
The ovarium is orange-coloured, and occupies the inferior and posterior 
half of the abdomen ; a duct comes from it, which penetrates a portion 
of the testis, and runs between the basis of the tentacula to the top of 
the abdomen, terminating at the anterior end of the branchiae. The 
testis occupies the larger anterior half of the abdomen, and is milk- 
white. In front, it passes into the foot, and ends in two small openings, 
which lie in the groove of the under margin. Another excreting yellow 
organ is found on each side before the muscle and under the anterior 
end of the branchia, and appears also by its outlet to stand in union 
with the foot. It may perhaps perform the function of an accessory 
gland. 
Sowerby has described some new species of the genus Pecten (Proc. 
p. 163), viz. ; — P.pictus, Philippines ; superhus, velutinus, the latter from 
Madagascar ; serratus, Philippines ; singaporinus, Singapore ; crassico- 
status, Japan ; alholineatus, Philippines ; splendidulus, Singapore ; 
pseiidolima, Philippines. All these are figured in his Thesaurus. 
Area galactodes, Benson ; Annals, ix. p. 489 ; rhomboidal, anteriorly 
sub-angular, posteriorly rounded, multi-radiated, margin smooth, epider- 
mis brown : Chusan. 
Moller, 1. c., adds three sub-genera to the genus Nucula, which he 
characterizes as follows : — 
Nucula ; animal sine tubis exsertilibus, pede brevi, crasso, pallii 
parte solum inferiore aperta. Testa subtrigona, rotundata, antice 
latiore, prominente, postice obtusa, circumcirca arete claudente; serie 
dentium acute angulata, dentibus anterioribus planis. Two new species 
from Greenland are described : N. corticata, Holb., and lenticula, 
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